Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (1): 14-22.doi: 10.12108/yxyqc.20240102

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Paleotectonic stress field and fracture characteristics of shales of Ordovician Wufeng Formation to Silurian Longmaxi Formation in southern Fuling area，Sichuan Basin

BAO Hanyong1, LIU Chao1, GAN Yuqing1, XUE Meng2, LIU Shiqiang2, ZENG Lianbo2,3, MA Shijie2, LUO Liang2   

  1. 1. Research Institute of Exploration and Development, Jianghan Oilfield Company, Sinopec, Wuhan 430223, China;
    2. School of Earth Sciences, China University of Petroleum(Beijing), Beijing 102249, China;
    3. Institute of Energy, Peking University, Beijing 100871, China
  • Received:2023-07-25 Revised:2023-09-01 Online:2024-01-01 Published:2024-01-02

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Abstract: Through rock mechanics experiment, acoustic emission experiment, comprehensive interpretation of seismic data, the finite element numerical simulation method was used to numerically simulate the paleotectonic stress field of marine shales of Ordovician Wufeng Formation to Silurian Longmaxi Formation in southern Fuling area. Combined with the measured results of cores, the development characteristics of structural fractures were predicted. The results show that:(1) The distribution of tectonic stress and fractures in southern Fuling area during the main formation period of fractures(the Late Yanshanian) was influenced by faults, rock mechanical properties, and tectonic stress. In areas where faults are widely developed, stress concentration can easily occur and cause large stress gradients.(2) Coulomb-Moore fracture criterion was used to predict the development of structural fractures in the study area, and the shear fracture index R was introduced to quantitatively characterize the strength of fracture development. The larger the value, the higher the degree of fracture development. Narrow and steep fault anticlines and fractures are developed near faults, mainly with high angle shear fractures, while the development of fractures is weakest in the wide and gentle synclines. The stress in the siliceous shales at the bottom of the Wufeng Formation Longmaxi Formation in the study area is concentrated, and the fractures are the most developed.(3) There are three favorable zones for the preservation of marine shale gas in the southern Fuling area:The Fenglai syncline, which is far away from the major faults and has not suffered significant damage during the main structural deformation period, is located in the low stress area with good preservation conditions, and is classified as class Ⅰ favorable zone;The Baima syncline, with small faults developed, stress values at a moderate level and moderate preservation conditions, is classified as class Ⅱ favorable zone;The Shimen-Jinping fault anti-cline, which has undergone strong transformation and is prone to large-scale shear fractures, making the preservation conditions damaged, is classified as class Ⅲ unfavorable zone.

Key words: thin plate model, rock mechanics parameter, finite element numerical simulation, tectonic stress field, shear fracture, Coulomb-Moore fracture criterion, fracture index, marine shale, Wufeng-Longmaxi Formation, southern Fuling area, Sichuan Basin

CLC Number: 

  • TE122.1
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