Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (6): 60-71.doi: 10.12108/yxyqc.20220605

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Fracture development models and significance of Ordovician WufengSilurian Longmaxi shale in Luzhou area，southern Sichuan Basin

YAN Jianping1,2, LUO Jingchao1,2, SHI Xuewen3, ZHONG Guanghai3, ZHENG Majia4, HUANG Yi5, TANG Hongming1, HU Qinhong6   

  1. 1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
    2. State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;
    3. Shale Gas Research Institute, PetroChina Southwest Oil and Gas Field Company, Chengdu 610051, China;
    4. PetroChina Southwest Oil and Gas Field Company, Chengdu 610051, China;
    5. Southwest Branch, CNPC Logging Company Limited, Chongqing 400021, China;
    6. Department of Earth and Environmental Sciences, University of Texas at Arlington, Arlington, TX 76019, USA
  • Received:2022-05-04 Revised:2022-06-07 Online:2022-11-01 Published:2022-11-09

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Abstract: Based on the data of cores， electrical imaging logging and conventional logging，the fracture types and combination characteristics，fracture information extraction and fracture development models of the deep shale of Ordovician Wufeng Formation-Silurian Longmaxi Formation in Luzhou area of southern Sichuan Basin were studied on the electrical imaging logging images，and the acoustic logging response of different fracture development models and their impact on the later fracturing stimulation were analyzed. The results show that：（1）With the increase of formation depth，the fracture dip angle and the complexity of structural fracture types gradually decrease of Ordovician Wufeng-Silurian Longmaxi shale in Luzhou area，southern Sichuan Basin. The well target section near the strong tectonic activity zone shows obvious development of medium and high angle structural fractures.（2）According to the relationship between structural fractures and bedding development， the fracture development models in the study area can be divided into six types： mixed development of structural fractures and bedding， medium-density bedding，tight bedding， strong structural fractures and weak bedding，large-scale structural fractures， and dense type. Among them， the mixed development of structural fractures and bedding and the medium-density bedding are the preferred types of fracturing.（3）Curve L was introduced（σ = k/n， k is a constant， σ is the average opening， n is the number of bedding）， the range of k and n values can effectively characterize the relative development degree of structural fractures and bedding，so as to divide and identify different fracture development models in the coordinate system.（4）Different fracture development models have certain differences in the P-wave and S-wave time difference and rock mechanical properties. The P-wave time difference of the mixed development of structural fractures and bedding and the strong structural fracture and weak bedding is smaller than that of the medium-density bedding and the tight bedding. The shear strength of the medium-density bedding is lower than that of the tight bedding.

Key words: deep shale gas, fracture development model, electrical imaging logging, acoustic time difference, rock mechanics, Wufeng-Longmaxi Formation, Luzhou area, southern Sichuan Basin

CLC Number: 

  • TE122
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