Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (4): 137-144.doi: 10.12108/yxyqc.20230413

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Development characteristics and accumulation model of sublacustrine fans of the first member of Eocene Liushagang Formation in Weixinan Sag，Beibuwan Basin

MAN Xiao, HU Desheng, WU Jie, GONG Liyuan, LIU Zhixuan, JIANG Yingde, ZHAO Ye   

  1. Zhanjiang Branch of CNOOC Ltd., Zhanjiang 524057, Guangdong, China
  • Received:2022-08-19 Revised:2022-09-19 Online:2023-07-01 Published:2023-07-01

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Abstract: Based on the data of 3D seismic，mud-logging，wire-logging and core observation，the sedimentary characteristics and main controlling factors of the sublacustrine fan of the first member of Eocene Liushagang Formation in Weixinan Sag of Beibuwan Basin were studied，and the lithologic trap development model and hydrocarbon accumulation model were determined. The results show that： （1） The sublacustrine fans are developed in lowstand systems tract（LST）and transgressive systems tract （TST）of the first member of Liushagang Formation in subsag A of Weixinan Sag. The sublacustrine fans in LST are developed near the No. 1 fault，which is characterized by continuous and strong seismic reflection，while the sublacustrine fans in TST are distributed in the sag，and have obvious mound reflection.（2）Controlled by two major factors of source supply and paleogeomorphology，the first member of Liushagang Formation in subsag A developed two stages of sublacustrine fans. During the period of LST，there was little source supply in short axis direction，the footwall of No. 1 fault was the accumulation center of the sag，small scale nearshore submarine fans that directly enter the lake were developed，and lithologic traps that dip upward and pinch out toward the source area were formed. During the period of TST，the source supply gradually increased，the activity of No. 1 fault weakened，and the accumulation center of subsag A gradually migrated to the sag. The loose sediments in the fan delta front transported again into the middle of the sag and developed sublacustrine fans. Lithologic traps that dip and pinch out toward the south slope，and structurallithologic traps shielded by No. 2 fault were formed.（3）Vertical migration conditions are the key factors for lithologic reservoir accumulation in the study area. Microfractures controlled by early faults and late structural differential settlement developed in the upper part of the hydrocarbon source layer of subsag A，providing a good migration path for oil and gas to vertically migrate through mudstone caprocks to the lithologic trap above the source and accumulate to form reservoirs. This area has a reservoir accumulation model of “overpressure driving，microfractures provide migration path， and accumulation in low potential areas”.

Key words: sublacustrine fan, lithologic reservoir, vertical migration, accumulation model, the first member of Liushagang Formation, Eocene, Weixinan Sag, Beibuwan Basin

CLC Number: 

  • TE122.2
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