and explored deeply. Key words South Sumatra Basin petroleum geology hydrocarbon distribution exploration potential Barisan 1 1

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1 GLOBAL GEOLOGY Vol. 35 No. 4 Dec P A doi /j. issn 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 China 2. CNPC Great Wall Drilling Company Ltd. Beijing 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 k

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.

2 and explored deeply. Key words South Sumatra Basin petroleum geology hydrocarbon distribution exploration potential Barisan km km m m % 56. 5% Fig. 2 2 Composite stratigraphic column of South Sumatra Basin Fig Location of South Sumatra Basin

3 Lahat Fig. 3 Geological profile of South Palembang Depression Talang Akar Ⅱ Talang Akar Talang Akar Gumai Ⅱ1 - - Talang Akar % 1. 2% 1. 4% % ~ 12% Suban 15% 100 ~ md 2Lahat 19% Muara Enim Gumai 20% 163 md 6Air Benakat Lahat Ⅲ 24% 107 md 300 md Puyuh 3 Talang Akar 5 14% ~ 29% 5 ~ md 4Batu Raja 3 Kasai 18% ~ 2 38% 20% 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 Gumai Talang Akar Batu 300 ~ 600 m Raja 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 Talang 4 Talang Akar Talang Akar Talang Akar Air Benakat Talang Akar Batu Raja % 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.

5 Talang Akar Batu Raja 6 15 Suban 16 Gumai Air Benakat 12 48% 52% Talang Akar Batu Raja Talang Akar Talang Akar Batu Raja 6 Fig. 6 Hydrocarbon accumulation model of South Sumatra Basin m 1. J XUE Liang-qing YANG Fu-zhong MA Hai-zhen et al. Petroleum play analysis of the PetroChina Contract Blocks

6 in the South Sumatra Basin J. Petroleum Exploration 10. and Development J YUN Jin-biao ZHOU Bo. Relationship between fault J MAO Zhi-guo FAN Tai-liang WANG Hong-yu et al. Formation and distribution of litho-stratigraphic reservoirs inside sequence stratigraphic framework North of South Sumatra Basin J. Petroleum Exploration and Development B J TIAN Shi-cun LIU Guo-chen TANG Lei et al. Sequence stratigraphic framework and play fairways in Block B of the South Sumatra Basin J. Oil & Gas Geology Hall R. Cenozoic geological and plate tectonic evolution of SE Asia and the SW Pacific computer-based reconstructions model and animation J. Journal of Asian Earth Sciences J YANG Lei. Petroleum geology and exploration potential analysis in the Central Sumatra Basin J. Xinjiang Petroleum Geology J ZHANG Qin ZHU Xiao-min DONG Guo-dong et al. Control of tectonic evolution on sedimentary systems and hydrocarbon accumulation the South Sumatra Basin J. Petroleum Geology and Recovery Efficiency Jabung J LIU Ya-ming ZHANG Chun-lei. Hydrocarbon accumulation characteristics and main controlling factors of the Block Jabung South Sumatra Basin J. Geology and Exploration M J YUAN Hao ZHANG Ting-shan WANG Hai-feng et al. Geochemistry and petroleum generation evaluation of Paleogene source rock in M Block of South Sumatra Basin J. Natural Gas Geoscience Michele G. Bishop. South Sumatra Basin province Indonesia The Lahat /Talang Akar-Cenozoic total petroleum system R. Colorado Open-file report 99-50S USGS system and reservoir formatting in Tazhong uplift and north slope area in Tarim Basin J. Global Geology J TAO Chong-zhi DENG Chao BAI Guo-ping et al. A comparison study of Brazilian Campos and Santos Basins hydrocarbon distribution differences and control factors J. Journal of Jilin University Earth Science Edition Hennings P Allwardt P Paul P et al. Relationship between fractures fault zones stress and reservoir productivity in the Suban gas field Sumatra Indonesia J. AAPG Bulletin J FU Guang FU Xiao-fei. Controlling of fault transport system and its combination to the formation and distribution of oil or gas reservoirs J. Global Geology Ripah J TIAN Xin WANG Xu-ben L Xi-min et al. Control of synsedimentary faulting on deposition in the back-arc rift basin of Ripah Oilfield in Jabung region the South Sumatra Basin J. Journal of Chengdu University of Technology Science & Technology Edition J LI Feng-jun JIANG Zhen-xue FU Guang et al. Transporting condition of faults required in formation of large and medium gas fields with high efficiency in rift basin J. Journal of China University of Petroleum J ZHANG Ting-ting YU Yun-liang WANG Huan. Relationship of transition structures with hydrocarbon reservoirs a case study in Zhangwu Fault Depression J. Global Geology

km t 2 4 Fig Tectonic divisions of Siberian platform

km t 2 4 Fig Tectonic divisions of Siberian platform 31 1 2012 3 GLOBAL GEOLOGY Vol. 31 No. 1 Mar. 2012 1004 5589 2012 01 0139 09 1 1 2 1 1 1 1. 130061 2. 130061 - P168. 130. 2 A doi 10. 3969 /j. issn. 1004-5589. 2012. 01. 017 Reserch on hydrocarbon accumulation