Block 43B - Onshore Oman

Transcription

1 Block 43B - Onshore Oman SUMMARY Block 43B is an 11,967 km 2 area located along the coastal area of Oman north of the Hajar Mountains. This is an unexplored region, both geographically and stratigraphically. Block 43B has time-equivalent formations with the interior of Oman but these have not been explored in any depth. The known formations located in the block are well-displayed in outcrop. Those that are the most likely reservoirs are thick and comparable in rock properties to oil-bearing formations in the interior of Oman. In the subsurface within the block these potential reservoir rocks have had gas shows. Conventional gas is the main play type across the block. Oil is also possible since this block s burial was not as deep as those to its south. While there have been no discoveries (only two wells have been drilled here) there are several prospects mapped across the block. 1

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3 BLOCK OWNERSHIP HISTORY Over its history Block 43B has had several owners, the primary ones being Petroleum Development (Oman) and Amoco. Other companies which have owned this block are: Hawasina, LLC MOL Only two wells have been drilled. The first was drilled in 1985 by Amoco: the Barka-1. The last well, the Hawasina-1, was drilled by MOL. The last owner of the block was MOL. AVAILABLE DATA 1,200 km of 2D seismic data Block seismic base map, satellite image map and infrastructure map Gravity data Data for two wells Seismic and well location base map STRATIGRAPHY 3

4 Oman chronostratigraphic chart (GTS 2012 dates incorporated) 4

5 The stratigraphic section that occurs within this block is predominated by Tertiary age carbonates and clastics. The Eocene and Paleocene formations are the most significant potential reservoirs. The Miocene through Pleistocene section has a complex stratigraphic architecture. This section is potential reservoir. The Campanian age Al Khwad Formation is a possible reservoir. From a chronostratigraphic point of view the section within Block 43B is equivalent to the post-fars, Fars, Hadhramaut and Aruma groups. Stratigraphic column for Block 43B 5

6 Stratigraphic relationships for Block 43B. The base of the Al Khwad Formation is an unconformity. In some areas this formation may sit directly upon ophiolites, as shown here. Based on outcrop and seismic analyses the entire stratigraphic section from Campanian through Holocene is characterized by numerous unconformities. These are directly related to two controlling factors: Post-Cretaceous structuring due to tectonic plate interactions. Sea level variations due to Tertiary age glacial episodes. In addition to the unconformities the block covers the northern platform edges for several thick intervals. Vertical build-ups and progradational clinoforms occur along these edges. Platform-edge mounding and clinoforms within the Seeb Formation. OUTCROP AND ANALOGS The Maastrichtian through Holocene sedimentary section is accessible and well-exposed in the mountains around Muscat. These provide a clear representation of the overall lithologies 6

7 and stratigraphic successions expected to occur within the block. The specific formations that outcrop around Muscat are: Undifferentiated Holocene, Pleistocene and Pliocene sediments Seeb Formation Rusayl Formation Jafnayn Formation Al Khwad The outcrop belts extend to Wadi Tiwi, westward along the coast from Muscat. DISCOVERIES There have been no discoveries within the block. Gas shows were encountered throughout the carbonate units in the Barka-1. PROSPECTS Several prospects have been mapped within the Seeb Formation. These occur along the coastal portion of the block. PLAY SUMMARY Conventional gas is the main play type across the block. Oil is also possible since this block s burial was not as deep as those to its south. TRAP Predominantly 2-way dip-closed, fault-bounded anticlines. Stratigraphic traps associated with reefs have been identified in adjacent blocks and are expected to occur within this block. Platform-edge mounding and progradation are visible on seismic within the block (see previous figure). Elsewhere in Oman, such as in the Natih and Shuaiba formations, such geometries result in successful stratigraphic traps. 7

8 SW to NE seismic line (4BAR-06/08) illustrating structure. Evidence of thrusting visible as are antithetics which create fault-bounded closures. RESERVOIR Reservoirs include stable, shelf limestones in the Seeb and Jafnayn formations, sandstones and conglomerates in Pliocene through Holocene deposits and limestone-dominated clastics in the Pliocene and Pleistocene deposits. Clastics in the Al Khwad Formation may also be of reservoir quality. The Seeb and Jafnayn formations have good reservoir quality with high porosity as well as permeability. SEAL Locally seals within the limestone units are probably thin but continuous shales/marls. On a more regional scale shaly units within the Rusayl Formation, marls within the Jafnayn and Seeb formations and Batinah Group marls and shales could serve as effective seals. The potential sealing intervals are visible in outcrop and contribute to the overall flat-iron patterns in the mountains near Muscat. SOURCE 8

9 The Early Eocene rocks are considered a primary source. Paleocene and Maastrichtian rocks may also contain source rocks. Numerous possible migration pathways exist along bedding and faults. MOVING FORWARD Proceeding further takes you out of the public area. Doing so gives you access to the raw data as well as the ability to order interpretation-ready and evaluation packages. There are 4 steps for moving forward. Step 1: MEERA Subscription for the bid round MEERA is the software platform being used by the MOG. It allows users to view data live and interactively from anywhere in the world. For more information on this platform please view the LDR video. The subscription permits general access and allows viewing of the data packages. The system is the official point of contact with the MOG and will be used for Interaction with the MOG, including clarification requests. Bid submissions Award notifications Step 2: MOG raw data viewing and purchase These data can be viewed live from anywhere in the world via the MEERA platform. Acquiring the raw data is simple. These data can be downloaded directly or can be provided on digital media for a selected destination. There is a large amount of raw data for this block. These data include seismic lines, well documents and gravity data. Following is a brief summary listing for seismic and well data. Seismic data: Results from 11 2D surveys in segy. BHP90BA: 19 lines MOL06REG1: 26 lines MOL06REG3: 3 lines MOL07REG1: 175 lines MOL08REG1: 219 lines MOL10YNQ1: 39 lines MOL11YNQ1: 6 lines REP11MA_1: 5 lines REP11MA_2: 4 lines SDO96BA_1: 39 lines 9

10 UNK50BA_2: 16 lines Those surveys possessing a high number of lines may contain a smaller number of total lines which have been processed in several ways. Well Data: Not all wells contain the same types of data. Most have log data and many have a series of well documents. Some wells also have core data. Barka-1 Hawasina-1 Step 3: Target Oilfield Services interpretation-ready package viewing and purchase Target Oilfield Services has prepared an interpretation-ready Petrel project. The Petrel project contains all seismic data and MOG raw well data. Step 4: Target Oilfield Services evaluation package viewing and purchase Target Oilfield Services has completed a comprehensive block interpretation. This interpretation has rectified data errors and inconsistencies. It places the block within a regional context and incorporates Target's extensive knowledge of Oman's geology and reservoirs. Intended to aid in block analysis the evaluation package provides a significant advantage to anyone trying to assess this block. The evaluation package for Block 43B contains the following. A geological evaluation report for the block. o Reviews and updates/corrects stratigraphy across the block. o Contains a sedimentological study for the entire Fars through Huqf interval. o Reviews and provides details on the geologic structures within the block. o identifies existing and additional prospects within the block. Well log data o Edited, spliced and QC log files for wells o Interpreted logs for wells Fault interpretations of the 2D seismic data for the following horizons. o Miocene Unconformity o Top Oligocene o Top Seeb Formation o Top Jafnayn Formation Multi-horizon TWT and depth interpretations of the 2D seismic data. o Miocene Unconformity o Top Oligocene o Top Seeb Formation o Top Jafnayn Formation 10

11 Data are in digital format and can be provided as: o Downloadable data in standard digital formats. o A complete Petrel project containing the wells, well logs, seismic data and interpretations. o A complete Kingdom project containing the wells, well logs, seismic data and interpretations. MINISTRY INFORMATION When available the standard MOG data to be provided include: All 2D and 3D seismic data within the block boundaries Gravity data associated with the block Well files for all wells in the block (note: these may not exist for all wells) Cultural data: Infrastructure, etc. Surface topography maps Contact: Suleiman Saif Al Ghuniami Director of Petroleum Concessions Ministry of Oil and Gas Tel Fax s.alghunaimi@mog.gov.om TARGET OILFIELD SERVICES INFORMATION Contact: ldrsupport@targetofs.com 11