Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (5): 130-138.doi: 10.12108/yxyqc.20220511

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Hydrocarbon accumulation characteristics of the second member of Sinian Dengying Formation in the north slope of central Sichuan paleo-uplift

ZHOU Hongfei1,2, DAI Xin1, JIA Min1, ZHANG Rui1,2, LI Guohui1, LI Nan1, YANG Qiang1, BAI Rong1   

  1. 1. Research Institute of Exploration and Development, PetroChina Southwest Oil & Gas Field Company, Chengdu 610051, China;
    2. Key Laboratory of Gas Evaluation and Exploitation of Sichuan Province, Chengdu 610021, China
  • Received:2021-12-02 Revised:2022-05-05 Online:2022-09-01 Published:2022-09-06

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Abstract: The hydrocarbon accumulation characteristics of the second member of Sinian Dengying Formation (Deng 2 member)in the north slope of central Sichuan paleo-uplift were comprehensively studied by means of fine core description,thin section identification,hydrocarbon source correlation and seismic facies characterization. The results show that:(1)During the depositional period of Deng 2 member,restricted platform facies and platform margin facies are mainly developed in the north slope,with relatively developed platform margin algal mound facies and grain shoal facies. The average values of reservoir thickness,storage-land ratio,porosity and permeability of Dengying 2 member are 176.6 m,34.6%,4.4% and 3.6 mD,respectively. It belongs to low porosity and low permeability reservoir,and the reservoir quality is better than that in Gaomo area as a whole. (2)The Sinian-Cambrian in the north slope have good accumulation conditions,multiple sets of source rocks are developed, with two types of source-reservoir configuration:upper source and lower reservoir,and side source and side reservoir. The natural gas of Dengying 2 member is mainly supplied by source rocks from Qiongzhusi Formation and the deep Sinian source rocks.(3)Deng 2 member in the study area has the conditions for forming structural-lithologic gas reservoirs and lithologic gas reservoirs. The large-scale faults in the updip direction and the effective sealing of lithologic tight zones are the key for hydrocarbon accumulation and formation of different gas water systems. (4)Deng 2 member in the study area has better reservoir conditions,source rocks and source-reservoir configuration than that in Gaomo area,showing the geological basis for forming large gas fields. The amount of trap resources has reached 1.05×1012 m3,with great exploration potential,so it is an important replacement field for large-scale gas field exploration in central Sichuan paleo-uplift.

Key words: platform margin algal mound facies, grain shoal facies, low porosity and low permeability, upper source and lower reservoir, side source and side reservoir, the second member of Dengying Formation, Sinian, north slope, central Sichuan paleo-uplift

CLC Number: 

  • TE122.2
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