NDP Seabed Project. Reports archived in Licens2Share (L2S) 27/05/2015

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1 NDP Seabed Project Reports archived in Licens2Share (L2S) 27/05/2015

2 TITLE DESCRIPTION INSTITUTION AUTHOR DATE 2D Seismic data processing - Site survey NH9651 Møre & Vøring Final report 6404/5-GB1A Sonic calibration synthetic seismograms checkshot report Zero offset VSP Assessment of a major fault structure at the Northern Storegga Headwall for Slope Stability - Storegga Slide Crack systems Backstripping NAUST Formation The main objective of the processing was delineation of fault planes, shallow gas anomalies and to pinpoint other potential drilling hazards. The 2D high resolution data were obtained by Geoteam during September 1997 Report on well velocity survey, describing the Zero Offset VSP data acquisition and processing in the well 6405/5- GB1A. Four additional files are reported separately (picture files). This research project covers the following: (1) To evaluate whether and map where fluid escape features, shallow gas accumulations and BSRs can be observed along newly acquired higher resolution seismic profiles across the crack structures; (2) To model the present-day extent of the gas hydrate stability zone in order to determine whether or not the crack structures coincide where the Base of Hydrate Stability Zone (BHSZ) intersects with the upper slope of the mid-norwegian continental margin; and (3) To model the gas hydrate stability conditions in the area since the Last Glacial Maximum (LGM), incorporating both documented sea level changes and estimates for bottom water temperature fluctuations. Therefore, a geophysical survey was carried out onboard the R/V Jan Mayen (University of Tromsø) to analyse and map this structural feature in more detail. Two main objectives have been undertaken within this project: (1) Amino acid analyses of IMAGES core MD , Spectrum Energy & Information Ltd., Woking, Read Well Services A/S, Stavanger UiT, Department of Geology, Tromsø UiB - Department of Earth Science, Bergen Hawke, M NN Vanneste, M Hjelstuen, B. O. et al

3 BP Norge a.s. Ormen Lange - Phase 1 site survey BP Norway Rig Survey Ormen Lange Barden Prospect NOCS 6305/7-98B COSTA Cruise Report - Storegga Slide southern Vøring Plateau, and (2) High-resolution backstripping of the NAUST formation. (3 appendices are reported separately). This report presents the results of the Barden Well Site Survey, NOCS 6305/7, Ormen Lange area. The aim of the survey was (1) to locate any obstacles or hazards on the seabed prior to the safe anchoring of a semisubmersible rig over the Ormen Lange area, and (2) to provide detailed bathymetry of the seabed at the Ormen Lange development. Additional reporting on field work data, data processing, track charts, data examples and interpretation charts. This report presents the integrated results from three separate surveys carried out by independent companies at NOCS 6305/7 Ormen Lange area (navigation and acquisition details, rig site survey NOCS 6305/7 and the Ormen Lange Barden Prospect). 13 2D high-resolution sleeve gun seismic profiles (in total 365 km) perpendicular to the fault zone have been acquired by the University of Tromsø during a R/V Jan Mayen expedition in the Summer of 2002, in order to analyse the distribution of gas hydrates and free gas in the area. Additionally, 3 gravity cores and 2 CTD stations giving the salinity, temperature and density in the water column were recovered. 3.5 khz echo-sounding data were recorded simultaneously with the sleeve gun data. Knowledge of the seabed morphology and sub-seabed configuration in the Storegga Slide area is important for mapping the present-day seabed stability. UiT - Department of Geology, Tromsø McNeill E. and M. Hayter McNeill E. and I. J. Lane NN Coastal and Deepwater The survey offshore Finneidfjord (Sørfjord) is carried out Geological Survey of Longva, O. et

4 Offshore Geohazards C-Dog Project Coastal and Deepwater Offshore Geohazards C-Dog Project Phase II Coastal and Deepwater Offshore Geohazards C-Dog Project Phase III as a part of the C-DOG project under the International Centre of GeoHazards 6 Offshore Geohazards activity to map and study the reasons for sliding in submarine conditions. The report gives an overview of the data collected and onsite information. (Participating institutions: NGU, Geological Survey of Norway, Trondheim, Norway; NOCS, National Oceanography Centre, Southampton, ; NGI, Norwegian Geotechnical Institute,, Norway; MARUM, Centre for Marine Environmental Sciences, Bremen, Germany) This document presents an executive summary of the R&D project C-Dog Phase II, obtained with funding from different sources, and complemented with in-kind contributions of the partners. The aim is to complete and complement a recently established, integrated geoscientific research project that focuses on understanding the occurrence and dynamics of submarine and coastal landslides in different environments off Norway, particularly the Finneidfjord natural field laboratory and the Vesterålen margin. The summary largely contains results and activities during This report summarizes the work performed mainly during the final phase of C-Dog (Coastal and Deepwater Offshore Geohazards) R&D project. The document builds further on the reports delivered after the previous phases, particularly the Executive Summary submitted in 2012 (end of Phase I, February 2012) and the Phase II report (February 2013). The central topic of the research deals with an integrated approach to study submarine Norway, Trondheim (and other institutions) al Vanneste, M. et al Vanneste, M. et al

5 Deep water sampling and the influence of gas. Analyses and recommendation report Deep Water Sampling: Phase 3. Analyses and Recommendation Report Deep water sampling and the influence of gas. Result of laboratory tests instabilities in different environmental settings. The two target areas were the Finneidfjord natural laboratory and the little-known Vesterålen upper slope where nine isolated, shallow landslides have occurred. This document presents an Executive Summary of the Research and Development project C-Dog Phase II The main objectives of the project have been to establish criteria for evaluation of sample disturbance for deep water samples and to establish the most relevant procedures for reconsolidation of samples to account for sample disturbance due to the sampling process itself and the large total stress relief that occurs during deep water sampling. Another aim has been to develop procedures for obtaining and assessing soil design parameters from both in situ and laboratory test results. The present report is covering Phase 3 of a project on the effect on sample disturbance on soil parameters as measured in laboratory tests. The main objectives of Phase 3 have been to extend the previous work in this project to evaluate the effect of sample disturbance on the following factors: rate of shearing strength anisotropy cyclic loading earthquake loading The results of classification tests, oedometer tests and triaxial tests on clays from Lierstranda test site (Norway) and Bothkennar test site (Scotland) are given in this report. This project is a joint industry project and a continuation (Phase 2) of an another joint industry Geotechnical Institute Lunne, T. et al Lunne, T. et al Strandvik, S

6 Deep Water Sampling: Phase 3. Result of laboratory tests Deep Water Sampling: Phase 3. Analysis and recommendation Deep-Water Bathymetry Regional Survey in the Møre/Vøring Area (NH0256) Earthquake Hazard and Submarine Slides. Final report project, «Optimal Use of Soil Data from Deep Water Sites». The laboratory testing was performed on two different clay types. A low plasticity clay (Lierstranda) and a high plasticity clay (Bothkennar). This report gives a factual description of the equipment and procedures used and the results of the laboratory tests carried out on three types of clays. A description of the clays at the two chosen sites for research: Daneviksgate (Drammen) and Lierstranda (outside Drammen), both in Norway, is included for completeness as well as descriptions of equipment procedures used for obtaining the samples and carrying out the laboratory tests. This report is covering Phase 3 of a project on the effects of sample disturbance on soil parameters as measured in laboratory tests. Special emphasis has been given to aspects related to soil parameters for slope stability evaluation. The reporting covers Regional Deep-Water Bathymetry surveys of several areas in the Møre/Vøring area. The Fugro Survey Ltd vessel M/V Geo Prospector conducted the survey work. The survey consists of five areas, named Areas A to E, and 5 reports are reported separately. In addition comes shaded relief and contour maps, DGN files and pinger navigation data. Based on the current knowledge and available data referring to the geologic and seismotectonic conditions offshore Mid-Norway in general, and to the seismicity in particular, the main objectives of this study have been to (1) estimate contours of peak ground acceleration (PGA) Strandvik, S Lunne T. et al Fugro Survey AS, Hobberstad, O. P. NORSAR, Kjeller Bungum, H. et. al Not dated

7 Earthquake Hazard Update and Slope Stability Evaluation. Active faulting and earthquake loading Earthquake Hazard Update and Slope Stability Evaluation. Effects of local soil response on earthquake motion and load effects for bedrock outcrop in five areas containing the deep water blocks Gjallar Ridge, Vema/Nyk, Helland-Hansen, Møre Vest and Ormen Lange. The contour maps have been produced for an annual probability of exceedance of 10-2 and 10-4, and extended to areas outside the licensed blocks where possible submarine slides could initiate, and (2) develop normalized earthquake design spectra for the annual exceedance probability 10-2 and 10-4, based on the estimates for one representative point within each area. (Note that the main report is digitized in reverse order). The objective of the present study has been to develop earthquake loading criteria along three profiles on the mid-norwegian margin for annual exceedance probability levels of 10-2 and 10-4, where an important part of the study has been a special effort to identify and quantify potentially active faults in the vicinity of each of the 200 km long profile lines. Nine separately reported files describe the work. The influence of the local site response on the sea bed earthquake motion in the Møre and Vøring basins was evaluated in the Phase 1 of the Seabed Project based on the available soil data at the time. The purpose of the analyses described in the present report is twofold (1) Evaluate the site response effects for the soil profiles established in the 1997 site investigation campaign and compare them to the previous results, and (2) Perform a preliminary evaluation of the conditions under which a strong NORSAR, Kjeller Lindholm C.. et al Nadim, F

8 Earthquake Hazard Update and Slope Stability Evaluation. Evaluation of slope stability and submarine slides Evidence of active or recently active tectonic faulting on the continental margin offshore Mid- Norway Experience with drilling in ooze sediments Field report for regional site survey NH January 1997 earthquake could act as a triggering mechanism for slope failure. This report gives an assessment of slope stability along specific profiles in the northern Vøring Basin, in the central Helland-Hansen Arch, and in the southern Ormen Lange Dome. Detailed stability analyses have been carried out for critical profiles crossing the Storegga slide edge. A strong earthquake is considered the main triggering mechanism for potential slides. The main objective of this study has been to further elaborate on possible evidence of active or recently active tectonic faulting on the mid-norwegian margin by including additional seismic data and critically evaluate the resolution and stratigraphic control in the available data. The objective of the work described here has been to identify and describe potential hazards to drilling based on existing experience from drilling in ooze. The work is intended to give an overview, and includes references to previous work and recommendations for additional work that may be required to discuss topics more fully. The main objective of this survey was to acquire information on seabed topography, seabed morphology, seabed sediment distribution, seismic stratigraphy, and variations in seismic signature indicating variations in geology and sediment properties. The data will be used, in the future, at a regional scale to establish a geological model of the area and at a local scale for more site specific tasks such as selection of future drilling Kalsnes, B. et al NORSAR, Kjeller NN IKU Petroleum Research (SINTEF Group), Trondheim Geoteam AS (now Fugro Survey AS, ) Sættem, J. and Rendall H NN

9 Full Waveform Inversion on Seismic Data from the Mid- Norwegian Continental Margin Gas hydrates on the Norway - Barents Sea - Svalbard margin. (Framdriftsrapport 2) Gas hydrates on the Norway - Barents Sea - Svalbard margin. (Framdriftsrapport 1) Geological & geophysical interpretation in Møre/Vøring Area Phase I Regional shallow seismostratigraphy in the Møre and Vøring area (Britsurvey report) locations. A full waveform inversion technique has been applied to multichannel seismic reflection data from the Møre continental margin, in order to determine the detailed velocity structure of one classical bottom simulating reflection (BSR) and an underlying double BSR, here called BSR0. The main objective is to quantify gas accumulations in the 1) form of hydrates in sediments on the Norway - Barents Sea - Svalbard (NBS) margin; including an assessment of their dynamics and impacts on the seabed, and 2) their response on sediments and biota, to provide knowledge vital for a safe exploitation in oil and gas production. The main objective is to quantify gas accumulations in the 1) form of hydrates in sediments on the Norway - Barents Sea - Svalbard (NBS) margin; including an assessment of their dynamics and impacts on the seabed, and 2) their response on sediments and biota, to provide knowledge vital for a safe exploitation in oil and gas production. Phase I established a coarse regional framework of seismic horizons and seismic features and proposed a nomenclature system. This work was carried out by IKU. Their interpretation was based on a grid of 4100 kilometres of 2D Seismic data which had been partly reprocessed to improve the resolution in the uppermost 1500 metres of sediments. UiT - Department of Geology, Tromsø UiB - Department of Geology, Bergen UiB - Department of Geology, Bergen Andreassen, K Haflidason, H Haflidason, H Fanavoll, S. et al Geological & geophysical The present report documents the results of a Charisma- IKU Petroleum Research Fanavoll, S. et

10 interpretation in Møre/Vøring Area Phase I Regional shallow seismostratigraphy in the Møre and Vøring area (SINTEF report) Geological & geophysical interpretation in Møre/Vøring Area Phase II Final report text and charts Geological & geophysical interpretation in Møre/Vøring Area Phase III, Stage 1 Final report text and figures based interpretation of 4100 km of conventional seismic lines from the deep water areas of the Møre and Vøring basins offshore Mid-Norway. Approximately 3100 km of these seismic lines had been reprocessed in order to enhance the interpretability of the data down to the first seabed multiple. Hence the objective of the work reported herein has been to establish a regional seismostratigraphy for the shallow (upper 1500 m) geology of the area. The Base Upper Pliocene boundary has been interpreted in almost the entire area, and local subdivision has been provided for different areas. The Top Lower Eocene boundary and Oligocene and Miocene reflectors have also been interpreted. A diagenetic reflector is interpreted and several other features of relevance for shallow geological conditions are indicated and commented on. The objectives of the G&G Interpretation Phase II work were to establish a regional geological/seismostratigraphic framework for the Møre and Vøring Basins by further developing and refining the framework proposed in Phase I. This work is based on 3285 kilometres of new high resolution seismic data acquired in 1998, in addition to the Phase I seismic data. (Additional information reported to this report). Phase III, the current work, is based on the result of Phase I and II and has a twofold objective. Stage 1 is to extend the regional database by Incorporating field data acquired in 1997 and other relevant data such as 3D data from the deepwater licences, additional 2D data from Møre West, and data and results from the ENAM project. (SINTEF Group), Trondheim al McGiveron S. et al McGiveron S. et al

11 Geological & geophysical interpretation in Møre/Vøring Area Phase III Geotechnical stability cross profiles Final report text and charts Geological & geophysical interpretation in Møre/Vøring Area Phase III, Stage 2 Geological model for the Cenozoic development Final report text and charts Geological and Geophysical Interpretation Phase IV Final report, Volume 1 Text Stage 2 Is to establish a geological model based on the extended database and other relevant projects. (Final charts reported separately. Additional information on time structure (42 items), average velocity grid (5 items), specific charts (43 items), geotechnical borings, data profiles, structural & regional overview, bathymetric display). Phase III, the current work, is based on the result of Phase I and II and has a twofold objective. Stage 1 is to extend the regional database by Incorporating field data acquired in 1997 and other relevant data such as 3D data from the deepwater licenses, additional 2D data from Møre West, and data and results from the ENAM project. Stage 2 Is to establish a geological model based on the extended database and other relevant projects. (Additional information found in 6 reports). This report presents the results of Stage 2 of the Seabed Project G&G Interpretation Phase III; the database used is that established during Stage I. This report should be read in conjunction with the Stage 1 report which was completed in March A model is offered for the late Cenozoic development of the Mid-Norwegian margin by establishing five time intervals that readily characterise the margin evolution. (Additional information found in 43 reports). The objective of G&G Interpretation Phase IV is to incorporate additional exploration seismic, new seismic data acquired in 2001 and any other relevant data into the regional database worked on in Phase III of the project in order to (1) Extend the Seabed Project area McGiveron S. et al Evans D. et al McGiveron S. et al

12 Volume 2 - Charts Geotechnical Optimization of Seabed Sampler Phase I. Criteria for sampler design Geotechnical Optimization of Seabed Sampler Phase II. Detailed criteria of new sampler and plans for testing out prototype Geotechnical Optimization of Seabed Sampler Phase III. CPT tests of specially designed sleeves and tests of prototype sampler GIS database and web services. The NDP Seabed project (SP2-05-GS-01R ) across the Vøring Plateau and further west into deeper water areas of the lower continental slope, (2) Create a simplified stratigraphic model with fewer horizons, (3) Map the geometry of the main sediment bodies, Naust Successions R, S, U and W, (4) Map geohazards and structural features, and (5) Map the run-out and slide lobes of the Storegga Slide. (Volume 2 Charts is reported separately and so is 276 reports related to the work). Phase 1 comprises a comprehensive review of all aspects of seabed sampling, and this resulted in design criteria for a new seabed sampler. Phase 2 comprises results of finite element analyses where soil/material interface laboratory tests were used to make detailed design of the sampler. Phase 3 comprises the final prototype sampler, which was manufactured and tested onshore at NGI's soft clay test site in Onsøy and offshore at the Troll field in the North Sea. An ArcView GIS database and a Web Map application have been established for the Seabed project in the Norwegian Deepwater programme (NDP). The applications gives fast geographic access to maps and reports mainly from phase IV of the Seabed Project by NGU - Norges Geologiske Undersøkelse, Trondheim Lunne, T. and M. Long Lunne, T. et al Lunne, T. and M. Sjursen Ryghaug, P. et al

13 Guidelines to tophole logging of 15th round wells Havsule Final Site Investigation. Regional site urvey. Havsule NOCS 6404 Interpretation report 26 July-13 August 2000 Final & Operations Report Havsule Final Site Investigation. Shallow Geological Model. Havsule NOCS 6404 hyperlink functionality to the current NDP home page on Internet [ (The report is accompanied by necessary information to describe the database). The objective for logging potential hydrates or ooze zones is the early identification of zones giving rise to drilling and/or safety hazards. Secondary objectives for tophole logging include seismic tie and rock mechanical properties. There are also good reasons for having a more complete logging programme than what is usually the case for topholes for these 15th round locations. Evidence of more complex geology is present from seismic interpretation, warranting an extended logging programme. This report documents a Regional Site Survey carried out within block NOCS The survey was undertaken between the 26th July and 13th August, 2000 using the survey vessel M.V. Svitzer Mercator. This report volume is arranged into two sections. Section 1 details the fieldwork, the type of geophysical and positioning equipment used, calibration procedures and system performance. Section 2 describes how the raw data has been processed and the results presented. (Additional information is reported separately in 135 items on the regional site survey and 95 items on the geological model). The objective of this report is to present in a nontechnical format a shallow geological model for the Havsule prospect in NOCS This is to enable an understanding of the physical processes and potential hazards within this complex area by a multidisciplinary Norsk Hydro ASA (now Statoil) Sollie, F McGiveron S. et al Hayter, M. et al

14 Large Scale Sliding Offshore Northern Norway Late quaternary sedimentary environment in the Trænadjupet Slide area off mid-norway Lithological and Chronological Analyses of Geotechnical Borings Marine Geological Cruise Report - GANS (Mid-Norwegian continental shelf, Ranafjorden- Sørfjorden and Lofoten-Vesterålen margin) audience. Particular emphasis is placed on slope stability issues. The investigations have focused on the distal Trænadjupet Slide and the Andøya Slide. The aim was to elucidate the sedimentary processes involved, their age, and triggering. The report describes and discusses the Trænadjupet slide and the continental slope immediately north-east and south-west of the slide including two older, partly buried slopes. The report is based on two manuscripts submitted to the international geological journals. The main objectives of this geological analytical program are to construct a lithological and a chronological framework for the four geotechnical/geological borings performed in the Møre and Vøring Basins in 1997 by the Seabed Project. (Reported in htm format). The marine geological cruise to the Mid-Norwegian continental shelf, Ranafjorden-Sørfjorden and the Lofoten-Vesterålen margin was carried out by R/V G.O. Sars, and is a scientific contribution to the: (1) Seabed IV project Assessing Offshore Geohazards: site surveying, sampling and comparison of shallow, submarine landslides in coastal and deepwater environments, Northern Norway (C-DOG), where the main aim is to decipher the signature of slide planes through a geological, geotechnical and geophysical programme, and the (2) NFR Petromaks project LOSLOPE, where the main objective is to investigate the slope stability off Lofoten. UiT - Department of Geology, Tromsø UiT - Department of Geology, Tromsø Laberg, J. S. et al Laberg, J. S. and T. O. Vorren UiB, Bergen NN UiB - Department of Earth Science, Bergen Haflidason, H. et al

15 Measurements and analysis of synthetic sediment samples with R11 hydrate Møre and Vøring Regional Survey Phase II (NH9753) Møre and Vøring Soil Investigation Borehole 6404/5-GB1A Wireline logging Møre and Vøring Soil Investigation Evaluation of the expendable penetrometer Naglfar Sub-Regional Report (NOCS 6706/5 & 6) An experimental setup was designed and used to measure how the acoustics P and S velocity, electrical resistivity and permeability were affected by the presence of R11 (trichlorofluoromethane CCl3F) hydrate in synthetic porous sediment samples. The field work of this report covers a geophysical component of the Phase II survey carried out by the survey vessel M/V Geo Scanner in August, September and October 1997 as well as a bathymetrical component performed in November 1997 using the Simrad EM300 deep water Multibeam Echo Sounder installed on board the survey vessel M/V Geo Prospector. (Appendices 1-5 are reported separately on processing of navigation, single and multibeam echosounder data and single channel seismic data). Wireline logging from MV Bucentaur performed with mineral logging tools. This report contains details of work carried out by BRE (British Research Establishment) in the 1980's and also reviews the state of the art research. The report also contains BRE interpretation of the results from two Sonatech tests carried out on behalf of Statoil in 1996/97. The report comments on other research being carried out in this specialist area and gives recommendation for the future development of these tools. This study, the Naglfar sub-regional report, covers an area of some 380 square kilometres on the western flank SINTEF Energy - Multiphase Flow Laboratory, Trondheim Fugro-Geoteam AS (now Fugro Survey, ) BPB Wireline Services, Loughborough, (status today unknown) Jacobsen, K. A. et al Lundqvist, D NN Chown, R Ayers S. et al

16 Natural gas hydrates beneath the sea floor: identification and interpretation Update report Natural gas hydrates beneath the sea floor: identification and interpretation. A literature study NDP Seabed Project II Seafloor Mapping Trænadjupet Slide Area of the Naglfar dome. The study is based on a combination of reprocessed 3D data, 2D high resolution data, archive 2D lines, seabed geotechnical and geochemical samples an offset borehole and two offset composite well logs. This report encompasses the shallow geological sequence from seabed to the bottom of the seismic records within the Cretaceous, and details conditions throughout the area within this top-hole zone. The aim of this report is to present the shallow stratigraphy and geohazards within the on a non-location specific basis. (Additional information on the survey is reported separately). Update of March 1997 literature study where 1) how natural gas hydrates and associated free gas have been and can be identified and interpreted from drilling, from logs and from seismic reflection data, and 2) possible geohazards related to natural submarine gas hydrates. The primary objectives of this study has been, based on available literature, to describe 1) how natural gas hydrates and associated free gas have been and can be identified and interpreted from drilling, from logs and from seismic reflection data, and 2) possible geohazards related to natural submarine gas hydrates. Predicted physical properties for gas hydrate-bearing sediments are presented and discussed, to provide a basis for understanding the methods on seismic interpretation and modeling. The Trænadjupet slide area is mapped with multibeam echo sounder (MBE) to provide data to enable interpretation of the seabed morphology and the slide UiT - Department of Geology, Tromsø UiT - Department of Geology, Tromsø Geoconsult (now DOF Subsea Norway, Bergen) Andreassen, K Andreassen, K Hauger, E

17 Survey Report Pre-study of the Trænadjupet area Annual Report Pre-study of the Trænadjupet area (NGU) - Project Report Quantification of geological processes that govern basin scale fluid flow at Nyegga (3D-P-Cable Seismic Test) history as well as the slide mechanism. The purpose of the survey was to provide general seabed documentation for the Trænadjupet slide area located west of Bodø (approx 68º N 09º E). This included a survey area of approximately km2 and three reconnaissance lines stretching approximately 80 km NNW from the Northern edge of the defined survey area. The water depth ranges from 400m to 3000m, with the majority of the area being deeper than 2000m. (6 additional reports support the main report). This report summarizes the activity in the project 'Slope stability in the Trænadjupet area', for the period September 2004 to December This study comprises: 1) A compilation of datasets available for the Seabed Project, concerning the shallow geology of the northern mid-norwegian margin (Trænabanken- Trænadjupet-Røstbanken areas with adjacent slope and deep-water areas). 2) An evaluation of the stability of the Trænadjupet Slide and adjacent slope area. Prestudy of the shallow geology in the Trænadjupet area in the northern part of the mid-norwegian margin. Cruise report covering the investigationthe overall objective of the NFR and STATOIL funded PETROMAKS project (contract /S30) is the Quantification of geological processes that govern basin scale fluid flow. The selected working area to be investigated during this cruise is on the Mid- Norwegian margin. The objective of the cruise is to NN (possible Norsk Hydro ASA, now Statoil) NGU - Norges Geologiske Undersøkelse, Trondheim UiT - Department of Geology NN Ottesen, D. and L. Rise Mienert, J. et al

18 Regional site survey - NH9657 Final report Regional Survey Storegga Slide Area Reprocessing of marine 2D seismic data investigate the origin of fluid flow and their conduits at the Nyegga area using 2D seismic, and test P-CABLE 3D high-resolution acoustic imaging methods. The report describes the acquisition of bathymetrical, morphological and seismic data in the Møre and Vøring Basins approximately between 62 o North and 68 o North in the Norwegian Sea. The field work described in this report covers the first of two data acquisition surveys. The second data acquisition survey will be carried out in 1997 and will focus on deep water bathymetry. The main objective of this survey was to acquire information on: Seabed topography, seabed morphology, seabed sediment distribution, seismic stratigraphy, and variations in seismic signature indicating variations in geology and sediment properties. (Additional 8 reports contain Appendices and Charts). The report covers a regional survey in the Storegga Slide area, (Møre Basin). The purpose was to obtain subseabed and high-resolution seismic data for a regional geophysical investigation. The acquisition was performed during two surveys. The surveys are presented separately due to the usage of different vessels and partly different equipment. (Additional 27 reports support this main report). This report covers seismic reprocessing of approximately 3,100 km of 2D seismic data. The reprocessed surveys were the VB87, VB89, VB90, MB91 and MB92 2D deep seismic data sets within the Vøring area, to be used as a reference data set for mapping the geological features in connection with future drilling activities in the area. Geoteam AS (now Fugro Survey AS, ) Fugro Survey AS, Geoteam AS (now Fugro Survey, ) Sviland J. and F. Steward Popp, M. and M. Jones Hermansen, D

19 Seabed Project Area A and B. Survey Results. Final Report Vol. 1 Seabed Project data exchange and CAD manual Site survey NOCS6704/12-1S Gjallar Ridge Site survey at location 6305/5-1 Site survey at location 6305/5-1 The report describes the result of a ROV based geophysical and bathymetric survey, including seabed sampling in two areas, Seabed Project area A and B in connection with the Ormen Lange Survey approximately 120 kilometres to the south. The survey was undertaken to obtain information about the stability of the seabed, seabed topography and shallow geology in the area. The two small areas had been selected for investigation, as they displayed grooves and fissures possibly related to the Storegga Slide. This manual contains the overall rules to be applied using CAD and exchange of information on digital formats in the Seabed Project for the Møre and Vøring basin. This report represents the results of a combined 2D/3D site survey carried out for Saga Petroleum ASA. The fieldwork for the 2D survey (SG9710) was undertaken by Fugro-Geoteam between 1-4 September (Data examples and interpretation evaluations are reported separately). This reports contain interpreted seismic results and derived maps. The results represent an evaluation of drilling hazards down to approximately m at the proposed well site.a summary of the shallow drilling conditions at the planned well location is presented in Chapter 2 of this report. The purpose of this report is to evaluate possible drilling hazards and to describe the sea floor conditions and the shallow geology at the proposed 6305/5-1 location. Special attention has been given to existence and Geoconsult (now DOF Subsea Norway, Bergen) Hydro E&P Division, (now Statoil) NN (possible Norsk Hydro ASA, now Statoil) Brittain, M. et al Berg, K Kinnersley Z. H. and G. P. Cooper NN

20 Site Survey Reports for Geotechnical Borings in the Møre/Vøring Area Final report Text and Charts Slide and slide run-out in the Møre/Vøring basin area Morphology and improved methods for analysis of run-out distance of submarine slides Sliding foundation project Technology review desk study distribution of shallow gas and gas hydrates, existence of boulders in the sediments, features on the seabed (pockmarks, corals, wrecks, slide deposits, debris etc.), slope of the sea floor, slope stability, shallow stratigraphy and lithology, underconsolidated sediments (ooze), and the main seismic database used to prepare the report consists of 3D seismic NH9602, reprocessed 4 fold sub cube of the 3D seismic (NH9602R), the 2D high resolution seismic surveys: NH9651 and NH9754 and the ROV survey NH9760. This report contains interpreted seismic results and derived maps. (Text, figures, maps and charts published in htm-format). Four Boring Sites A, B, E and I have been selected from an initial list of ten suggestions. The sites selected are designed to address a range of problems relating to stability and other safety issues and to improve general understanding of the factors affecting development of the Norwegian continental margin. The main purpose of this report is to draw attention to any hazards which may be problematic during drilling. The report comprises improved methods for analysis of run-out distance and dynamics of submarine slides. Numerical simulations of the Storegga slide and comparisons between observed and simulated slide morphology were performed to improve the understanding of submarine slide processes and material and flow models. The scope of work includes a study of the current state of the art, the required soil characterization and a feasibility study for generating a suite of design tools. Cathie Associates SA/NV, Diegem, Belgium Kinnersley Z. H. and G. P. Cooper Gauer, P Lee, L., B. Stuyts, A-M. Vernant

21 Slope stability in the Trænadjupet area Annual Report The different types of PLET foundations are reviewed first, together with the installation techniques and size restrictions of installation vessels. Characterization of deep water soils is then discussed with a view to characterizing the soil for PLET geotechnical design. Available in-situ and laboratory testing methods are reviewed and their suitability is critically assessed. Parameter selection for PLET foundation design is discussed subsequently. Soil-steel interface friction is a governing parameter for PLET design and the characterization of this parameter is reviewed in detail. Subsequently, the design methods which are in use today are explained and their applicability for different types of foundations is discussed. Background is given on existing design practice and guidance is provided for static design of different types of PLETs. Finally, the elements for a methodology for free-to-slide PLET foundation design are proposed. The currently available design guidance is reviewed and requirements for further work are highlighted. The multi-disciplinary nature of free-to-slide PLET design is stressed. This report gives a summary of the work during the last year in the project 'Slope stability in the Trænadjupet area'. The project focuses on the upper stratigraphy of the outer mid-norwegian shelf, with emphasis on the slope stability. Data from several sources have been compiled (regional single beam bathymetry, detailed multibeam bathymetry, bathymetry from 3D seismic cubes, 2D and 3D seismic and core information) in order to improve the understanding of the depositional NGU - Norges Geologiske Undersøkelse, Trondheim Ottesen D

22 Stratigraphical analyses on cores from a fracture zone off NE Storegga Slide escarpment Submarine slides A literature study Submarine slides Effects on local soil response on earthquake loads Submarine Slides - Laboratory testing of marine sediments from the Norwegian continental margin Temperature effects on laboratory strength measured on soft clay environment of the shelf during the last 3 million years. The work is part of Dag Ottesen s Ph.D study funded by NDP. The main objective of this geological analytical program is to study the lithological and the environmental stratigraphical succession in a selection of short cores (gravity/selcores), retrieved from an open fracture/fissure cone area east of the NE Storegga Slide escarpment. The results of these analyses are expected to provide information to estimate the potential these cores have for dating the generation of these zones and/or their latest movements. This report presents a literature survey with an overview of conditions required for submarine slides to occur, methods for evaluating seabed slope stability, submarine slide dynamics, travel distance of submarine slides and forces exerted on structures from submarine slides. The influence of the local site response on the sea bed earthquake motion in the Møre and Vøring basins is evaluated in this report. This report presents laboratory testing results from three offshore samples from the Norwegian continental margin. The samples were obtained as gravity cores, and those sent to NGI for geotechnical testing ranged from 1.47 to 2.05 m below seabed. The three samples were obtained in water depths of 798, 914 and 1846 m. The test results indicate some sample disturbance. This report summarises results of tests and analyses of tests carried out in three phases over a period of 4 years. Altogether 16 series of tests have been carried out by UiB - Department of Geology, Bergen 1) Haflidason, H. and T. Flatebø Instanes, A. and C. B. Harbiz Nadim, F Mokkelbost, K. H. Chang-Shin, G. et al

23 sampled in deep water and cold environment - Phase 3 The NDP Seabed Project, Phase II. Project Summary and Main Achievements The Seabed Project - A summary of main achievements NGI and Montana State University (MSU). MSU have done tests on reconstituted clays and NGI on intact samples from onshore and offshore clays. The Seabed Project was formed in 1996, as part of the Norwegian Deepwater Programme (NDP), and has lasted through The project has been carried out in 2 phases, Phase 1 in the period , and Phase 2 from 2001 to The aim of the project was to improve and systemise the knowledge of the seafloor topography, the shallow geology and potential geohazards, in order to ensure safe and cost effective exploration activity and to provide relevant input data to early field development studies in the deepwater areas offshore Mid-Norway. The first phase, which was the largest when measured in used resources, was to a large degree a broad, reconnaissance project. Phase 2, on the other hand, has been more focused, and aimed at remaining challenges defined after Phase 1 (summarised in The Seabed Project A summary of main achievements, Report no. SP-32-NG-01R ). The present report contains a brief summary of Phase 1, but the main focus of the report is on the results achieved through Phase 2 of the Seabed Project. Following an initial phase in 1995, the present Seabed Project was initiated in 1996 by the operators of the 7 deepwater licences awarded in the 15 th Norwegian concession round. The project area covers the continental slope from the shelf break at m depth to roughly 2500 m depth, between N and N, comprising the Møre Vøring petroleum 2) Montana State University 1) Geotechnical Institute; 2) Norsk Hydro, (now Statoil) Solheim, A Solheim, A. et al

24 TOBI Sidescan Sonar Survey on the Upper Storegga Margin: South-Storegga Slide headwalls and pathways and the Vøring Plateau Slope TOBI Survey Cruise Report on the Norwegian Margin Upper North Sea Fan, Storegga Slide, Vøring Plateau and Trænadjupet Slide provinces. The goal of the project was to improve and systemise the knowledge of seafloor topography, shallow geology and potential geohazards concerning field development activities. The project has been carried out as a co-operation between academia and industry, and a number of institutions and companies have been involved in the investigations. The results are presented in several individual reports on different aspects of the project. The present report is meant to give an overview of the major studies and their results and achievements. The TOBI (Towed Ocean Bottom Instrument) sidescan sonar survey of the upper Storegga Slide is a part of the petroleum industry sea bottom mapping program covering the license areas on the Mid-Norwegian margin. The present sidescan imagery cruise was run by the University of Bergen and planned in co-operation the Southampton Oceanography Centre. The present TOBI sidescan sonar survey (carried out by the research vessel R/V Pelagia) in the Storegga area, of ca km2, is an important contribution to the detailed mapping of the seafloor morphology at the Ormen Lange Field and of selected target areas in the upper Storegga Slide area. The objectives of this cruise are to run the TOBI sea floor imaging vehicle to provide a suite of geological observations on the detailed morphology and shallow seismic character of the seafloor within three key target areas on the Norwegian margin, south of 68 o N. These new observations are aimed to complement existing data from earlier cruises 1) UiB, Department of Geology, Bergen 2) Ocean Research Service, Southampton Oceanography Centre, Southampton, 1) UiB, Department of Geology, Bergen 2) UiT, Institute of Biology and Geology, Tromsø 3) University of Southampton, Haflidason, H. et al Haflidason, H. et al

25 into these areas, where synoptic-scale morphological data, along with seismic architecture and core material were acquired. The research vessel RRS Charles Darwin was chartered for this cruise. Southampton 4) British Geological Survey, Edinburgh,