35 4 2016 12 GLOBAL GEOLOGY Vol. 35 No. 4 Dec. 2016 1004 5589 2016 04 1052 06 1 1 1 2 1. 100031 2. 100101 5 P618. 130. 2 A doi 10. 3969 /j. issn. 1004-5589. 2016. 04. 015 Petroleum geology features and exploration potential analysis of South Sumatra Basin LU Xiao-xin 1 REN Huai-jian 1 ZHOU Guo-wen 1 LIU Hou-wu 2 1. Sinochem Petroleum Exploration and Production Co. Ltd. Beijing 100031 China 2. CNPC Great Wall Drilling Company Ltd. Beijing 100101 China Abstract Based on the data collected from various sources and applying the theories and methods of basin analysis this paper summarizes the tectonic-sedimentation evolution and petroleum geology characteristics of South Sumatra Basin discusses the oil and gas distribution patterns and analyzes its hydrocarbon exploration potential. The results show that the South Sumatra Basin is a Cenozoic back-arc rift basin experiencing 5 stages in evolution including pre-rifting rifting transition sag and compression. The principal source rock of the basin is carbonaceous shale and coal depositing during the transition stage. The main reservoirs are found in upper Oligocene sandstones lower Miocene carbonates and pre-paleogene crack basement. Generally the hydrocarbon distribution is characterized by patterns of gas in the deeper reservoirs oil and gas in the middle reservoirs and oil in the shallower reservoirs. Oil and gas are enriched in the structural traps and structural combination traps. Faults favorable sedimentary facies of reservoirs and paleo-highs are the principal factors controlling the oil and gas distribution. The South Sumatra Basin has good hydrocarbon accumulation conditions and favorable exploration potential. Faulted slopes surrounding the source kitchens paleo-highs are the advantageous exploration areas. In addition the stratigraphic traps and lithologic traps in the depressions are also prospecting exploration targets. They should be studied 2015-09-03 2016-01-11 042010009k
4 1053 and explored deeply. Key words South Sumatra Basin petroleum geology hydrocarbon distribution exploration potential 0 1 5 4-7 2 1 2 Barisan 1 12. 5 10 4 km 2 11. 1 10 4 km 2 3 1896 2014 320 5. 5 10 8 m 3 7 731. 6 10 8 m 3 43. 5% 56. 5% Fig. 2 2 Composite stratigraphic column of South Sumatra Basin Fig. 1 1 1 Location of South Sumatra Basin
1054 35 2 Lahat 3-3 1 Fig. 3 Geological profile of South Palembang Depression Talang Akar Ⅱ Talang Akar Talang Akar Gumai Ⅱ1 - - Talang Akar - 4 0. 9% 1. 2% 1. 4% 8 2. 2 6 1 1 0. 3% ~ 12% Suban 15% 100 ~ 1 000 md 2Lahat 19% Muara Enim 2. 1 5Gumai 20% 163 md 6Air Benakat Lahat Ⅲ 24% 107 md 300 md Puyuh 3 Talang Akar 5 14% ~ 29% 5 ~ 3 000 md 4Batu Raja 3 Kasai 18% ~ 2 38% 20% 1 000 md
4 1055 2. 3 Gumai Talang Akar Batu 300 ~ 600 m Raja 2 000 m 9 Talang Akar 44% 28% 14% Talang Akar Batu Raja Talang Talang Akar Batu Raja Akar Air Benakat Batu Raja - Air Benakat NW Talang Akar - SE 2. 4 16 - - Talang 4 Talang Akar Talang Akar Talang Akar - - 5 - Air Benakat Talang Akar Batu Raja - - - 90% 33% 22% Akar Fig. 4 4 Histograms of oil and gas reserve held in different assemblies of South Sumatra Basin 3 5 Talang Akar TAF Fig. 5 Facies and fields distribution of Talang Akar Formation TAF 1 Batu Raja 58% 19% 40%
1056 35 10 11 - Talang Akar Batu Raja 6 15 Suban 16 Gumai Air Benakat 12 48% 52% Talang Akar Batu Raja 13 5 1 5 2 Talang Akar Talang Akar Batu Raja 6 Fig. 6 Hydrocarbon accumulation model of South Sumatra Basin 3 4 4 3 500 m 1. J. 2005 32 3 130-134. 14 XUE Liang-qing YANG Fu-zhong MA Hai-zhen et al. Petroleum play analysis of the PetroChina Contract Blocks
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