南苏门答腊盆地J区块中新统Gumai组岩性油气藏成藏条件及有利区带

doi:10.12108/yxyqc.20230615

Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (6): 138-146.doi: 10.12108/yxyqc.20230615

• PETROLEUM EXPLORATION • Previous Articles Next Articles

Hydrocarbon accumulation conditions and favorable zones of lithologic reservoirs of Miocene Gumai Formation in block J,South Sumatra Basin

HONG Guoliang, WANG Hongjun, ZHU Houqin, BAI Zhenhua, WANG Wenwen

PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China

Received:2023-04-28 Revised:2023-05-29 Online:2023-11-01 Published:2023-11-07

Abstract

Abstract: Lithologic reservoirs are developed in the lower member of Miocene Gumai Formation in South Sumatra Basin. Based on logging,mud logging and seismic data,combined with regional setting,the hydrocarbon accumulation conditions and main controlling factors of the lower member of Miocene Gumai Formation in block J of South Sumatra Basin were studied,and the favorable zones were predicted. The results show that:（1）Oil and gas in block J of South Sumatra Basin mainly come from the eastern Betara hydrocarbon generation sag,and there are three sets of source rock developed,namely,the source rocks in the lower member of Talang Akar Formation,the source rocks in the upper member of Talang Akar Formation,and the source rocks in Gumai Formation. Among them,the marine continental transitional source rocks developed in the lower member of Talang Akar Formation are the best,mainly type Ⅰ or Ⅱ kerogen,containing a large number of coal seams. The TOC content is mainly 0.5%-2.0%,hydrogen index（HI）is mainly 100-350 mg/g,and the average oxygen index（OI）is 30 mg/g.（2）The lower member of Gumai Formation in block J developed a set of sedimentary systems from east to west,including proximal delta front,distal delta front,and prodelta. The proximal delta front in the eastern part of the block is mainly composed of thick sandstone,while the distal delta front in the western part is mainly composed of mudstone with thin sandstone. Massive medium to fine sandstones are the main reservoir rocks,with widely developed argillaceous bands,which are underwater distributary channels and overbank in the delta front.（3）The lithologic reservoirs of Gumai Formation in block J are controlled by mudstone seal and major faults. Oil and gas are mostly concentrated in distal delta front with high shale content and good sealing conditions in the western part of the block.（4）The lithologic reservoirs in the lower member of Gumai Formation in block J have a hydrocarbon accumulation model of“lower generation and upper storage,composite transport,and caprock controlled reservoir”. The W and P regions in the central part are favorable areas for lithologic reservoir exploration.

Key words: lithologic reservoirs, delta facies, caprock controlled reservoir, lower generation and upper storage, marine continental transitional source rocks, lower Gumai Formation, Miocene, Betara hydrocarbon generation sag, South Sumatra Basin

CLC Number:

TE122

HONG Guoliang, WANG Hongjun, ZHU Houqin, BAI Zhenhua, WANG Wenwen. Hydrocarbon accumulation conditions and favorable zones of lithologic reservoirs of Miocene Gumai Formation in block J,South Sumatra Basin[J].Lithologic Reservoirs, 2023, 35(6): 138-146.

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Hydrocarbon accumulation conditions and favorable zones of lithologic reservoirs of Miocene Gumai Formation in block J,South Sumatra Basin

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