Volume 24 Issue 4
Aug.  2018
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Article Navigation >  Journal of Geomechanics  > 2018  >  24(4): 452-464
ZHONG Cheng, QIN Qirong, ZHOU Jiling, et al., 2018. STUDY ON FAULT SEALING OF ORGANIC-RICH SHALE BY PRESENT STRESS: A CASE STUDY OF LONGMAXI FORMATION IN DINGSHAN AREA, SOUTHEAST SICHUAN. Journal of Geomechanics, 24 (4): 452-464. DOI: 10.12090/j.issn.1006-6616.2018.24.04.047
Citation: ZHONG Cheng, QIN Qirong, ZHOU Jiling, et al., 2018. STUDY ON FAULT SEALING OF ORGANIC-RICH SHALE BY PRESENT STRESS: A CASE STUDY OF LONGMAXI FORMATION IN DINGSHAN AREA, SOUTHEAST SICHUAN. Journal of Geomechanics, 24 (4): 452-464. DOI: 10.12090/j.issn.1006-6616.2018.24.04.047
shu

STUDY ON FAULT SEALING OF ORGANIC-RICH SHALE BY PRESENT STRESS: A CASE STUDY OF LONGMAXI FORMATION IN DINGSHAN AREA, SOUTHEAST SICHUAN

doi: 10.12090/j.issn.1006-6616.2018.24.04.047
  • 1.

    State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, Sichuan, China

  • 2.

    School of Science and Technology, Southwest Petroleum University, Chengdu 610500, Sichuan, China

  • 3.

    Chuanzhong Oil and Gas Field, Southwest Oil and Gas Field Company, PetroChina, Suining 629000, Sichuan, China

  • 4.

    Exploration Company, SINOPEC, Chengdu 610041, Sichuan, China

More Information
  • Received: 2018-03-12
  • Revised: 2018-06-11
  • Published: 2018-08-01
    Abstract
  • The study of fault sealing has important reference value and guiding significance for the preservation and evaluation of oil and gas reservoirs and exploration of the distribution of oil and gas. Based on the technologies and methods of FMI imaging logging, focal mechanism solution, field hydraulic fracturing, triaxial mechanical experiment, finite element 2D-σ method and so on, the direction, intensity of the present geostress and the rock mechanical properties of the Longmaxi Formation in Dingshan area were analyzed. The sealing property of faults near well location was evaluated preliminarily. The results show that the direction of the present ground stress is generally from NEE-SWW(55°±5°)to SEE-NWW(110°±5°). The maximum principal stress of the Longmaxi Formation is about 145.0 MPa in the Well DY2, and the superimposed normal stress on the fault plane is about 188.4 to 218.3 MPa. The rock is in the plastic deformation stage with a simple fracture mode, generally good fault sealing, gas-bearing properties and test results, the brittleness index about 41.6% to 49.0% and the burst factor about 0.197 to 0.355.The present maximum principal stress of shale formation in the Longmaxi Formation of the Well DY1 is about 52.0 MPa, and the superimposed normal stress of the fault plane is about 75.8 to 83.1 MPa. The rock in the Longmaxi Formation of the Well DY1 is in the elastic deformation stage with a more complex fracture mode, generally bad fault sealing, gas-bearing properties and test results, the Rickman brittleness index about 48.5% to 55.0% and the rock fracture coefficient about 0.355 to 0.671. The fault sealing near shale formation of the Longmaxi Formation in the well DY3 and the well DY4 are generally normal.

     

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