LOCATION : The two blocks are locating in the western side of the central part

Transcription

1 1&2 NORTHEAST OCTOBER & NORTH ISSRAN BLOCKS N. ISSRAN BLOCK NE OCTOBER LOCATION : The two blocks are locating in the western side of the central part of the Gulf of Suez basin west of October fields.

2 1 NORTHEAST OCTOBER BLOCK

3 1 NORTHEAST OCTOBER BLOCK NEARBY FIELDS : E. Tanka, GS 172, GS 173, NO-183 & October oil fields, SB 276 & GS 277 for BP Company. N. Amer for GPC Company. NW October for EGPC.

4 1 NORTHEAST OCTOBER BLOCK 2D &3D SEISMIC COVERAGE AREA : 254 km 2 WELLS : 5 Wells PREVIOUS CONCESSIONNAIRS : AMOCO, CONOCO and DEMINEX Co. SEISMIC SURVEYS : - 2D seismic (2942 km) - 3D seismic (313 km 2 ) Survey Name Coverage Operator Processing Center/Year GUPCO E. Tanka km 2 GUPCO Zeit Co./Devon S. October km 2 Dana Petroleum Petrographics 3D GUPCO E. Tanka 1995 = 272 km 2 3D Zetico/Devon S. October 05 = 41 km 2

5 1 NORTHEAST OCTOBER BLOCK NO. WELL NAME / NEW NAME COMPANY SPUD. DATE COMP. DATE LAT. LONG. T.D. FEET FORMATION REACHED FINAL STATUS 1 TANKA -2 (Gi ) AMOCO 13/08/ /10/ ,250 MIOCENE CLASTICS P & A Oil shows in Rudeis 2 TANKA -1 (Gi 80-5 ) AMOCO 19/10/ /12/ ,233 THEBES P & A 3 NO (Ha 80-2) AMOCO 18/05/ /08/ ,308 NUBIA P & A Oil shows in Eoc. & U. Cret. 4 C4NA -2 (Ha 79-2) CONOCO 18/11/ /01/ ,770 NUBIA P & A Oil shows in Eocene & U. Cret. 5 DD 83-1 (Ha 80-1) DEMINEX 14/06/ /10/ ,297 U. CRETACEOUS "WATA" P & A Tested 45 BO of 17 API from Thebes & Oil shows in Matulla.

6 2 NORTH ISSRAN OFFSHORE BLOCK

7 2 NORTH ISSRAN OFFSHORE BLOCK NEARBY FIELDS : E. Tanka, GS 172, GS 173, NO-183 & October oil fields for BP Company. N. Amer and Issran for GPC Company. NW October for EGPC.

8 2 NORTH ISSRAN OFFSHORE BLOCK 2D &3D SEISMIC COVERAGE AREA : Km 2 WELLS : 12 Wells PREVIOUS CONCESSIONNAIRS : PETROSA, DOVER, BG and TREND Co. SEISMIC SURVEYS : - 2D seismic (3653 km ) - 3D seismic (521 km 2 ) Survey Name GUPCO E. Tanka 95 PETZED Ezz EL Orban 08 E. Wadi Araba 98 Coverage 157 km km km 2 Operator GUPCO PETZED M.C. (multi client) Processing Center Western Geco PGS 3D (Multi clients) E.WADI ARABA 98 =229 km 2 3D PETZED EZZ EL ORBAN 2008 = 135 km 2 3D GUPCO E.Tanka 1995 = 157 km 2

9 2 NORTH ISSRAN OFFSHORE WELLS NO. WELL NAME / NEW NAME COMPANY SPUD. DATE COMP. DATE LAT. LONG. T.D. FEET FORMATION REACHED FINAL STATUS 1 DEEB 1 PETROSA 2 EWA 2 DOVER 3 EWA 3 DOVER SHAMS -1 (Ha 78-5) NIGMA -1 (Gj 79-4) LULI -1 (Gj 78-1) GI 78-1 (Gi 78-1) GI 78-2 (Gi 78-2) SABIL -1 (Ha 78-3) C4 NA -1 (Ha 79-1) THELMET NW -1 (Ha 78-2) BG BG BG TREND TREND UNION CONOCO UNION 08/05/ /08/ /12/ /01/ /12/ /01/ /02/ /02/ /12/ /01/ /09/ /10/ /05/ /08/ /02/ /03/ /05/ /09/ /10/ /12/ /07/ /08/ ,111 RAHA P & A 17,055 MATULLA P & A 7,310 U. CRETA. "RAHA" P & A 5,070 EOCENE P & A 11,600 NUBIA P & A 7,860 U. CRET. "RAHA" 10,537 NUBIA 6,919 NUBIA "C" 10,500 NUBIA "C" 10,440 NUBIA P & A P & A Oil shows in Matulla P & A, Oil shows in Miocene sands & Matulla Non Commercial tested 225 BOPD from Zeit Fm. P & A, Oil shows in Eocene Fm 9,050 NUBIA P & A 12 EE 81-1 (Gj 78-1) DEMINEX 05/01/ /04/ ,874 NUBIA P & A, Oil shows in Eocene & L. Senonian

10 1&2 NORTHEAST OCTOBER & NORTH ISSRAN BLOCKS Stratigraphic Column of NWO Field STRATIGRAPHY : The stratigraphic sequence of the block is shown in the fig., nearly a full Miocene and Pre-Miocene succession are present forming all the hydrocarbon elements. SOURCE ROCKS : - The upper Senonian brown limestone. - Wata and Raha of Nazzazate group. - Shale of L. Rudeis Fm. RESERVOIRS : - Nubian sandstone. - Upper Cretaceous (Wata& Raha fms). - Sandstone of Nukhul and Asl Fms. SEALS : - Shales and limestones in U. Cretaceous. - The Miocene evaporites and shales. Petrosalam Co., 2011

11 1&2 NORTHEAST OCTOBER & NORTH ISSRAN BLOCKS Source and Oil Migration: Source rocks in the area are: - The mature Eocene Thebes - Upper Cretaceous brown limestone. It is believed that the hydrocarbon present in this block comes from Issran, West October and Lagia basins.

12 1&2 NORTHEAST OCTOBER & NORTH ISSRAN BLOCKS REGIONAL STRUCTURAL CROSS-SECTION SHOWING RELATIONSHIP OF THE TWO BLOCKS & LAGIA TROUGH KITCHEN

13 1&2 NORTHEAST OCTOBER & NORTH ISSRAN BLOCKS It is evident from the petrophysical analysis that the Eocene Thebes limestone has net pay encountered in all the wells where it is intersected, with varying degrees of potential across the different wells of the area. Stimulation and/or hydraulic fracturing of the Thebes Fm. is required. Further wells should be planned towards the regions where the Thebes Fm is structurally at its highest position, as this study shows that it leads to higher effective porosity and higher net-to-gross ratio. PETROPHYSICAL STUDY ALONG WELLS (C4NA-1, C4NA-2, NO147-1 & DD83-1)

14 1 NORTHEAST OCTOBER BLOCK The Asl Member of Rudeis Formation shows some prospects in the southern part of the block. The sandstone of the lower part of Asl Mb is productive in the fields around the area (e.g. N. October field) and must be tested. DEPTH STRUCTURE MAP ON ASL FORMATION

15 1 NORTHEAST OCTOBER BLOCK RESIDUAL MAGNETIC MAP BASEMENT SHAPE MAP Aeromagnetic data indicates several positive and negative anomalies in the area. The anomalies are expressed as noses and closures in contours. The magnetic data and model confirms the presence of a basement high structure, as well as the presence of a NNW-SSE trending west bounding faults.

16 2 NORTH ISSRAN OFFSHORE BLOCK The Rudeis structure map in the northeastern part of the block showed Many prospects. these closures must be tested. They are tilted fault blocks and structurally highs. PROSPECT MAP IN NE PART OF NORTH ISSRAN BLOCK

17 (1&2) NE OCTOBER & N. ISSRAN BLOCKS LOCATION: The two blocks are locating in the western side of the central part of the Gulf of Suez basin west of October fields. NE October block covers 254 Km 2 with 2942 km 2D seismic and 313 3D seismic, the block comprises 5 (five) wells. While N. Issran block occupies an area of about km 2 and has 3653 km 2D seismic lines and 521 3D seismic, it comprises 12 (twelve) wells. EXPLORATION HISTORY: - Exploration history dates back to 1979 when Deminex acquired the area. - The wells were drilled in the block subsequently by Union, British Gas and Dover. - The Sabil-1 well was drilled by Union in 1986 to test NW-SE trending, easterly tilted fault block on the northern extension of the Bakr-Amer regional structural trend. The well was drilled to the Nubia sandstone at TD 10,500. Drilling problems were recorded and the well, nevertheless, encountered significant hydrocarbon shows throughout the section except 225 BOPD of 22 o API was flowed from the basal sands of Zeit Formation. - In 1995 BG Egypt announced commercial discoveries in EGB-1 and Sabil-1 and signed the south Zaafarana Development lease. - The Development lease was surrendered on September 12, 1997 after three years of discovery, as the operator did not produce oil on regular basis according to the terms of the Agreement. - In 2005 Arabian Oil Company (AOC) worked in the area and drilled two successful wells (NWO-1 in 2006) and (NWO-2 in 2010). Those wells were tested oil with very encouraging rates through three reservoirs (Nukhul, Mokattam & Thebes Fms). In 2010 the Arabian Oil Company declared the commercial discovery of Northwest October Field. 1 NE OCTOBER & N. ISSRAN

18 HYDROCARBON POTENTIAL: - SOURCE ROCKS: Oil analysis on ten oil samples from various fields surrounded the Issran trough indicate that the oils are all generated from mature marine carbonate source rocks, i.e. the Thebes (Eocene) and Brown limestone (Senonian) Formation. The area lies in the oil migration path of two different basins namely West October (to the east) and East Issran (to the southeast) at different times and has different qualities; Lagia basin has also a great effect on the area. - SEALS: Shale and limestone in the Raha and Matulla formation for Nubia reservoir. Some major shale sections within Late Miocene for Eocene and Miocene reservoirs. - RESERVOIR ROCKS: Lower Cretaceous sandstone (Nubia A Formation). Upper Cretaceous (Matulla and Wata formations). Eocene -Thebes & Mokattem Limestone. Multiple sand-bearing horizons of Miocene (Nukhul, Rudeis, Kareem & Zeit Fms.). Summary of NE October Block Wells TANKA-2 well (1991) - Hydrocarbon shows were found in Asl Formation (where the best porous and permeable intervals of the well are found). However, even though reservoir rocks were present, hydrocarbons quantities were small. 2 NE OCTOBER & N. ISSRAN

19 NO well (1990) - The NO was designed to investigate the crested position of a north easterly dipping Pre-Miocene tilted faulted block up dip from a DD 83-1 well, which had showings in the Matulla and Thebes Fm. - The Nubia reservoir was the primary objective, while the potential reservoirs in the Nezzazat and Asl Fm. provided the secondary objectives. - Hydrocarbons are found in three formations Sudr, Duwi and Thebes formations. In the Duwi, since the permeability is very low and the formation shows the characteristics of a source rock, it is not likely that this formation can become a good producing zone. - The Thebes Formation has high hydrocarbon saturation. The sonic data shows the presence of secondary porosity. The porosity is quite good (net pay porosity 12.65%), with the best porosities (up to 18%) being found at the top of the formation, however the average permeability is low (net pay permeability 5.93 md). - The best porosity and permeability of the well are found in the Nubia Formation. However, no hydrocarbons have been found in this formation. C4NA-2 well (1985) - The C4NA-2 well was drilled to test the Nubia sandstone of a high standing horst block on the east dipping flank of the Gulf of Suez. - The well was terminated before reaching the Nubia sandstones due to the lack of an up dip seal at the Matulla level. The Nubia sandstone was expected to be water bearing also. - Evaluation of the well results suggests that the C4NA-2 was drilled in a downthrown block to the west of the target fault block. - Hydrocarbons were found in the Thebes, Duwi and Matulla formations. - In the Duwi since the permeability is very low and the formation shows the characteristics of a source rock. - In the Matulla, even though reservoir rocks are present, hydrocarbons quantities are small. 3 NE OCTOBER & N. ISSRAN

20 - The Thebes Formation has hydrocarbon saturation (SW 15.15%). The sonic data shows the presence of secondary porosity. The porosity is good (24.53%), however the average permeability is low (2.14 md). - Hydraulic fracturing of the formation would then be recommended in order to produce the available oil. DD 83-1 well (1979) - DD 83-1 was drilled on the margin of a fault block trap; it was bounded on the southwest by a major clysmic antithetic fault complex. - Major objective: Nubian sandstone of the Albian (lower Cretaceous). - Secondary objective: Cretaceous sandstones of the Matulla and Raha formations. - Hydrocarbons were found in the Thebes Formation and during the well flowed 45 bbls of oil - The Thebes Formation has high hydrocarbon saturation (SW 9.2%). The sonic data shows the presence of secondary porosity. The porosity is good (12.37%), the best porosity (up to 20%) being found at the top of the formation, however the average permeability is low (7.6 md). - Hydraulic fracturing of the formation would then be recommended in order to produce the available oil. Summary of Issran Block Wells EWA-3 well (2003) EWA-3 was a deviated hole from EWA-2 vertical hole, this to test the Matulla and Nubia sands reservoir as primary target, and Belayim and Thebes dolomites as secondary target, and to test the southeast extension of the four way dip closure on top Belayim and top Thebes. Two core intervals were obtained from the top Belayim and top Thebes fractured dolomites. No oil shows were observed in both dolomites sections. However, the Thebes Formation core did have horizons of organic rich dolomites with source potential. 4 NE OCTOBER & N. ISSRAN

21 EWA-2 well (2003) - This well drilled to test the four way dip closure on top Nubia. - Primary objectives were Belayim and Thebes fractured dolomite. - Secondary targets were Pre-Miocene (Matulla and Nubia) reservoir. - Due to mechanical hole problems, the well was bottomed in the uppermost part of Matulla at a depth 5189 ft, and could not reach the Nubia reservoir target. - The drilling was very difficult because of the loss of drilling mud due to the presence of huge fractures. No oil / gas shows were reported during the drilling of these fractures and log evaluation confirmed that these fracture carbonates were water bearing. - The structural re-interpretation indicated that the well was drilled in a part of the extension of the Wadi Araba structure into offshore area. The well block continued uplifting during the late cretaceous. - A decision was therefore made to terminate the well and drill a sidetrack hole to test the updip section of Belayim and Eocene fracture carbonates. SHAMS-1 well (1993) - The primary target is the Sandstones of the Rudies and Nukhul Formation, with secondary potential in the Belayim and Kareem Formation. - This well aimed to test the up dip terminus of the hydrocarbon generating kitchen of the Issran trough and to confirm the quality of Miocene reservoir. - Unfortunately the encountered reservoirs: Belayim, Kareem, Rudeis, and Oligocene were water bearing while the Nukhul Formation was absent. - No gas shows were encountered in the well, except a very weak background gas starting from 4424 ft. down to the total depth. - No oil shows were traced in the well, except at 2790'/2800' and 3280' very weak oil shows were found. 5 NE OCTOBER & N. ISSRAN

22 NIGMA-1 well (1992) - Primary objective was Nubia while the secondary target is the Miocene clastic and Eocene fractured limestone. - The well encountered a full Miocene and Pre-Miocene succession and bottomed in Early Cretaceous Nubia sandstone. - The entire Brown Limestone section, local intervals in the Thebes Formation and the upper most part of Matulla Formation contain oilprone source rock with good to excellent oil generating capacity. Gasprone source rock with fair hydrocarbon generating potential; on the other hand, are encountered in Wata and Malha Formation, while rocks with oil and gas generating abilities are present in localized intervals in Thebes, Matulla and Wata Formation. - The Pre-Miocene section analyzed in this well contains organically rich rocks with the potential to generate hydrocarbons. The organically rich intervals from Thebes Formation ( ft, ft and ft), the Brown Limestone Formation ( ft) and the upper part of the Matulla Formation ( ft) have good to excellent oil generating capacity. - Quick look interpretation and reservoir evaluation for the potential reservoirs showed that all are water wet except the Brown Limestone of Duwi Formation. - A detailed interpretation and reservoir evaluation was made on this interval using the Elan program indicated the possibly of an oil bearing reservoir in the Brown Limestone formation. - A drill stem test was performed in this interval but the well didn't flow even after the acid job. LULI-1 well (1990) - The well drilled to test a thick proven quality Malha/Paleozoic Nubia sandstone reservoir, as well as several hundred cumulative feet of Rudeis sands. - A Miocene sandstone lenses is the primary target, and Eocene/Upper Cretaceous fractured carbonates and Belayim reefs is the secondary target. 6 NE OCTOBER & N. ISSRAN

23 - Luli is a west-dipping NW-trending elongated block which is bounded by major normal faults on its NE and SW flanks. - Drilling results showed that the well penetrated 2000' almost a complete Miocene section excluding Nukhul which was missing. The section was followed by thick Eocene carbonates and a complete Pre-Miocene section down to the Nubia sandstone and Um Bogma Formation with no oil or gas shows in all the horizons. GI 78-1well (1989) - This well was intended to test the Rudeis Formation in the downthrown fault block. - Shows in a fracture zone in the Brown Limestone were tested with negative results. GI 78-2 well (1989) - The well was drilled to test a possible reefal buildup within a Miocene platform carbonate sequence. - Viscous black oil staining was encountered in cuttings and cores from 2490 to 3410 ft depth. - Sandstones and carbonates in the Rudeis sequence were found to be water bearing. Minor oil shows were noted in sandstones of the Matulla and Wata formations. - Geochemical analysis of oil staining in sidewall cores from the Matulla Formation detected the presence of migrated hydrocarbons of a composition and maturity level matching that the relatively high gravity oil tested in EGB-1 to the east. - Log analysis indicated intermittent hydrocarbon accumulation in the Belayim/Kareem, Brown limestone, Matulla, and Wata Formation. - Reservoir quality was very good in the Nubian sequence, but the sandstones were saltwater bearing and didn't have hydrocarbon shows. 7 NE OCTOBER & N. ISSRAN

24 SABIL-1 well (1986) - The well was drilled on a NW-SE trending fault block dipping to the northeast. The test was to investigate the hydrocarbon potential of the thick Miocene sands and the fractured Eocene carbonates. - The Nubia sandstones and the Upper Cretaceous reservoirs were considered as secondary targets. - Significant oil and gas shows were encountered in the Zeit sands and Belayim, Kareem and Thebes carbonates. High gas readings were also recorded over the Brown Limestone, Wata carbonates and the entire Nubia sand section. - Log evaluation indicated possible pays in the Zeit Formation (30' with OWC at -2906'), Belayim/Kareem formations (+/- 80'), Thebes formation (130' with OWC at -6400') and Wata Formation (+/- 110'). The Nubia sandstones were totally water wet. - Five drill stem tests were conducted through over the Wata, Brown Limestone, Thebes, Nukhul and Zeit formations. The fifth test in the Zeit Formation flowed 225 BOPD, whereas the first four tests flowed salt water, - The well was plugged back and suspended as a non-commercial oil well. C4NA-1 well (1983) - The well was drilled to test the Cretaceous Matulla sandstone and Nubia sand sequence of a secondary fault block located on the eastern flank of a major NNW-SSE trending feature in the central Gulf of Suez. - One open hole drill stem test was conducted in the Eocene limestone which displayed good oil shows at interval from 7655' to 7975' and produced an oil/water mixture with a flow rate of 1 gal/min decreasing to 0.2 gal/min. the poor flow rate is probably due to low fracture permeability and the absence of effective matrix permeability. - Hydrocarbons were founded in the Duwi and Thebes formations. In the Duwi, since permeability is very low and the formation shows the characteristics of a source rock, it was not likely that can become a good producing zone. 8 NE OCTOBER & N. ISSRAN

25 - The Thebes Formation has high hydrocarbon saturation. The sonic data shows the presence of secondary porosity and the core analysis shows the presence of fractures. The porosity is good (net pay porosity 20.44%), with the best porosities (up to 30%) being found at the top of the formation, however the average permeability is low (net permeability 1.46 md) - During the well test, the gravity of the oil was estimated to be 25.5 API, which is relatively heavy. - The best porosity of the well is found in the Asl (23.06%) and the best permeability is found in the Rudeis and Asl Formation (65.36 md and md). However, no hydrocarbons have been found in these formations. - The Eocene oil produced from C4NA-1 is relatively mature marine oil probably sourced from carbonate rocks deposited under highly reducing conditions. EE 81-1 well (1980) - EE 81-1 was located on a horst block at the eastern edge of a stable platform which is tilted to the south. The drilling reached to Paleozoic Nubian Sandstones. - Minor hydrocarbon shows were reported in the Belayim/Kareem, the Nukhul, the Matulla and the Wata Formation, whereas the Nubian was found to be water wet. - Two DSTs were carried out in the Matulla Formation and recovered heavy oil (12 API) at a rate of 67 BOPD. An open hole DST in the Thebes Formation recovered 256 Bbls diesel and salt water, while a DST in the Belayim/Kareem Fm. recovered minor quantities of black residual oil. 9 NE OCTOBER & N. ISSRAN

26 Nearby Fields and Wells: - October oil field (Gupco): The majority of the production and reserves are found in the Nubia reservoir. The Nazzazat, Nukhul, and Asal reservoirs are considered secondary targets. - N. October oil field (Gupco): produced from Nubia-C, Matalla Fm and Asl Mb. (L. Rudeis). - N. Amer oil field (GPC): produced from Rudeis & Nukhul fms., Eocene Limestone Matalla Fm and Nubia sandstone. - Issran oil field (GPC): the main oil bearing zones are upper & lower dolomite in Belayim Formation and in Nukhul limestone. - NW October field (EGPC): Three main reservoirs were tested oil in NWO Field; they are Lower Miocene (Nukhul Fm.) and Eocene (Mokattam & Thebes Fms). 10 NE OCTOBER & N. ISSRAN