Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (3): 50-60.doi: 10.12108/yxyqc.20240305

• PETROLEUM EXPLORATION • Previous Articles    

Main controlling factors and distribution of reservoirs of the second member of Sinian Dengying Formation in Penglai gas field，central Sichuan Basin

XIA Maolong1, ZHANG Benjian1, ZENG Yiyang1, JIA Song1, ZHAO Chunni1, FENG Mingyou2, LI Yong1, SHANG Junxin2   

  1. 1. Research Institute of Exploration and Development, PetroChina Southwest Oil & Gas Field Company, Chengdu 610041, China;
    2. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China
  • Received:2023-04-23 Revised:2023-05-14 Published:2024-04-30

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Abstract: Based on data of rock cores, thin sections and analysis tests, a detailed study was conducted on the main controlling factors and distribution of the second member of Sinian Dengying Formation in Penglai gas field in central Sichuan Basin. The results show that:（1）The reservoirs of the second member of Sinian Dengying Formation in Penglai gas field are mainly composed of thrombolite dolomite, foam spongy dolomite and doloarenite. The reservoir space includes pores, caves and fractures, dominated by residual framework pores and small and medium-sized caves. The pores are mostly developed in microbial bonded dolomite and grain dolomite. The porosity of the reservoir in the upper Deng 2 member is 2.0%-11.0%, with an average of 4.43%, and the permeability is 0.005-10.000 mD, with an average of 1.19 mD. The porosity of the reservoir in the lower Deng 2 member is 2.00%-6.98%, with an average of 3.64%, and the permeability is 0.030 9-2.600 0 mD, with an average of 0.950 0 mD（. 2）The distribution and quality of reservoirs of Deng 2 member in the study area are jointly controlled by the distribution of microbial mound shoal, quasi syngenetic karstification and supergene karstification. High-quality reservoirs are mostly developed in the upper and middle parts of the upper Deng 2 member and the top of the lower Deng 2 member.（3）The lower Deng 2 member in the study area is generally a product of semi cyclical marine transgression, with vuggy-fractured reservoirs only developed in the upper part and reservoir undeveloped in the middle and lower parts. The upper Deng 2 member is mostly a product of regression and semi cycle. No. 1 sublayer developed in a secondary transgression background, with thin mound shoal, dominated by porous reservoir. No. 2 sublayer developed contiguous mound shoal under regression, with thick reservoirs mainly composed of vuggy reservoirs（mostly type Ⅱ reservoirs）, which is the main gas producing zone in the study area. The No. 3 sublayer is overall shallow water platform deposit in the late stage of regression, with well-developed botryoidal-lace shape structures and obvious karst transformation, dominated by karst reservoirs with superimposed fractures and caves（type Ⅲ reservoirs）.

Key words: microbial bonded dolomite, grain dolomite, microbial mound shoal, quasi syngenetic karstification, supergene karstification, transgression, regression, the second member of Dengying Formation, Sinian, Penglai gas field, central Sichuan Basin

CLC Number: 

  • TE122.2
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