Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (1): 108-119.doi: 10.12108/yxyqc.20230110

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Hydrocarbon accumulation characteristics of tight reservoirs of Da'anzhai member of Jurassic Ziliujing Formation in eastern Sichuan Basin

XIE Rui1,2, ZHANG Shangfeng1,2, ZHOU Lin3, LIU Haotian3, YAO Mingjun3, JIANG Xuegui1,2   

  1. 1. Key Laboratory of Exploration Technology for Oil and Gas Resources, Ministry of Education, Yangtze University, Wuhan 430100, China;
    2. School of Geosciences, Yangtze University, Wuhan 430100, China;
    3. Research Institute of Exploration and Production, Jianghan Oilfield Company, Sinopec, Wuhan 430070, China
  • Received:2021-10-13 Revised:2022-04-11 Online:2023-01-01 Published:2023-01-06

Abstract: The Da’anzhai member of Jurassic Ziliujing Formation in eastern Sichuan Basin has the typical characteristics of near-source hydrocarbon accumulation. By means of source rock evaluation,fluid inclusion analysis and burial history recovery,the reservoir characteristics and hydrocarbon accumulation of Da’anzhai member of Jurassic Ziliujing Formation in eastern Sichuan were studied. The results show that: (1) The organic matters of Da’anzhai member of Jurassic Ziliujing Formation in eastern Sichuan Basin are mainly type Ⅱ. The measured residual organic carbon mass fraction is 0.67%,the hydrocarbon generation potential is 1.53 mg/g,and the thermal evolution degree of organic matter is 1.1%-1.3%. On the whole,the source rocks of Da’anzhai member have medium to low abundance of organic matters,which is at the peak of hydrocarbon generation. (2) The lithologies of the first submember of Da’anzhai member in the study area are mainly shell limestone and limestone,and the structural fractures are the main reservoir space,followed by dissolved pores (caves) and dissolved micropores developed along the structural fracture. The reservoirs have poor physical properties with ultra-low porosity and ultra-low permeability. (3) There are two stages of crude oil charging and one stage of natural gas charging in the reservoirs of Da’anzhai member in the study area. The two stages of crude oil charging time are about 140 Ma and 25 Ma respectively. The first stage is relatively low maturity crude oil charging,the second stage is relatively high maturity crude oil charging,and the latter is the main charging period. The natural gas charging time is the same as the second stage of crude oil charging,which is mainly associated gas of crude oil.

Key words: tight reservoir, hydrocarbon accumulation, oil and gas charging, shell limestone, Da’anzhai member, Ziliujing Formation, Jurassic, eastern Sichuan Basin

CLC Number: 

  • TE122
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