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Zhe MAO, Lianbo ZENG, Longbu QIN, Kewei ZU, Guoping LIU, He TIAN. RESEARCH ON GROUND STRESS DISTRIBUTION RULES OF DEEP TIGHT VOLCANIC ROCK RESERVOIRS IN THE HUOSHILING FORMATION, XUJIAWEIZI FAULT DEPRESSION[J]. Journal of Geomechanics, 2018, 24(3): 321-331. doi: 10.12090/j.issn.1006-6616.2018.24.03.034
Citation: Zhe MAO, Lianbo ZENG, Longbu QIN, Kewei ZU, Guoping LIU, He TIAN. RESEARCH ON GROUND STRESS DISTRIBUTION RULES OF DEEP TIGHT VOLCANIC ROCK RESERVOIRS IN THE HUOSHILING FORMATION, XUJIAWEIZI FAULT DEPRESSION[J]. Journal of Geomechanics, 2018, 24(3): 321-331. doi: 10.12090/j.issn.1006-6616.2018.24.03.034
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RESEARCH ON GROUND STRESS DISTRIBUTION RULES OF DEEP TIGHT VOLCANIC ROCK RESERVOIRS IN THE HUOSHILING FORMATION, XUJIAWEIZI FAULT DEPRESSION

  • 1.

    College of Earth Science, China University of Petroleum, Beijing 102249, China

  • 2.

    State Key Laboratory of Petroleum Resources and Prospecting, Beijing 102249, China

  • 3.

    Exploration and Development Research Institute, Daqing Oilfield Campany, Ltd., Daqing 163453, Heilongjiang, China

  • 4.

    Research Institute of Exploraton and Development, Zhongyuan Oilfiled Company, Sinopec, Zhengzhou 450018, Henan, China

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Received Date:  23 January 2018
Revised Date:  13 April 2018
    Abstract
  • The XujiaweiziFault Depression is located in the north of the Songliao basin, and its deep Mesozoic Huoshiling formation is a dense volcanic gas reservoir with natural fracture development and strong heterogeneity of the stress distribution. The present ground stress orientation of single well is analyzed by induced fracture method and well diameter caving method, and the longitudinal distribution of present ground stress is calculated by acoustic logging method.The heterogeneous three-dimensional geological model is established according to the top-and-bottom surface maps, volcanic facies groups and fault distribution characteristics of the Huoshiling Formation. Based on the fitting and correction of dynamic and static rock physical parameters, the physical parameters of different lithofacies groups and fault rocks are determined in combination with experimental tests and existing research results, and the three-dimensional mechanical model is established. Ansys finite element numerical simulation software is used to establish the three-dimensional mathematical model of the Huoshiling Formation and to obtain the three-dimensional present ground stress distribution model by correlative calculation.The calculated results show that in the Huoshiling Formation the preferred orientation of the maximum horizontal principal stress is EW, with the stress values range from 86 to 110 MPa, and the minimum horizontal principal stress preferred orientation is SN, with the stress values range from 67 to 84 MPa. The simulation results show that the volcanic facies, characteristics of faults and structural relief have great influences on the present ground stress of the Huoshiling Formation, Xujiaweizi Fault Depression. Among them the horizontal principal stress orientation is greatly affected by the distribution of faults and the near-crater facies, while the value of the horizontal principal stress is controlled by them three. The horizontal stress in the lower position of the depression, the near crater facies and the fault ends are high.The results of present ground stress can provide important guidance for the next-stage of well networks arrangement, fracturing reformation scheme, horizontal well design and water injection management in the Xujiaweizi Fault Depression.
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