Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (6): 151-161.doi: 10.12108/yxyqc.20250614

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Current geostress logging evaluation of tight reservoir in the fourth member of Triassic Xujiahe Formation in Yuanba area, northeastern Sichuan Basin

LI Chunyang1, WANG Boli2,3, YAN Xiao1, LI Kesai3,4, DENG Hucheng3,4, SU Jinyi1, WU Yajun1, YE Tairan1   

  1. 1. Sinopec Southwest Oil & Gas Field Exploration and Development Research Institute, Chengdu 610041, China;
    2. Research Center of Geotechnical Engineering Technology, Chengdu University of Technology, Chengdu 610031, China;
    3. National Key Laboratory of Oil and Gas Reservoir Geology and Development Engineering, Chengdu University of Technology, Chengdu 610059, China;
    4. Energy College, Chengdu University of Technology, Chengdu 610059, China
  • Received:2025-04-22 Revised:2025-06-29 Online:2025-11-01 Published:2025-11-07

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Abstract: Yuanba area in northeastern Sichuan Basin has been subjected to multi-stage tectonic stress since Triassic, with complex coupling characteristics of faults, folding and geostress. Accurate evaluation of current geostress has become one of the key factors for the efficient development of gas reservoir. Based on the data from dipole shear waves, electrical imaging, multi-caliper, and conventional well logging, the current geostress logging evaluation of the fourth member of Triassic Xujiahe Formation in Yuanba area was carried out, and the spatiotem-poral sequence of structural deformation was redefined. The results show that: (1) Since Yanshanian period, Yuanba area in northeastern Sichuan Basin has primarily experienced NW-SE compression and thrusting during LateMiddle Yanshanian, followed by NE-SW compression and thrusting during Early-Middle Himalayan. This tectonic history resulted in the current structure framework of NE-trending structure superposition, NW-oriented modification, and multiple stages fault development with diverse orientations.(2) In the fourth member of Triassic XujiaheFormation of Yuanba area, the maximum horizontal principal stress(σH)ranges from 110 MPa to 140 MPa, the minimum horizontal principal stress(σh)ranges from 80 MPa to 100 MPa, and the vertical principal stress(σV)mainly ranges from 105 MPa to 125 MPa. The relationship of these three principal stress(σH > σV > σh)exhibits a strike-slip stress state, with the regional principal stress direction being NWW-SEE.(3) The geostress is generally controlled by burial depth, and the release of fault stress adjusts the distribution characteristics of geostress.Vertically, mudstone in the middle section of the fourth member of Triassic Xujiahe Formation is developed, and the overall magnitude of geostress in the upper part is higher due to the creep deformation of the mudstone. The research results can provide reference for the selection of sweet spots in gas field geological engineering, analysis of the effectiveness of natural fractures, and artificial fracturing of reservoirs.

Key words: tectonic evolution, tight reservoir, current geostress, rock mechanic parameter, logging evaluation, Xujiahe Formation, Triassic, Yuanba area, northeastern Sichuan Basin

CLC Number: 

  • TE122
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