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2019 Vol. 25, No. 4
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Ziyi SONG, Hao WANG, Jing LI, Luning SUN, Jiatai ZHANG, Chen LIU. RESEARCH ON THE INFLUENCE OF THE COUPLING EFFECT OF SEEPAGE AND STRESS ON RESERVOIR FRACTURES[J]. Journal of Geomechanics, 2019, 25(4): 483-491. doi: 10.12090/j.issn.1006-6616.2019.25.04.046
Citation: Ziyi SONG, Hao WANG, Jing LI, Luning SUN, Jiatai ZHANG, Chen LIU. RESEARCH ON THE INFLUENCE OF THE COUPLING EFFECT OF SEEPAGE AND STRESS ON RESERVOIR FRACTURES[J]. Journal of Geomechanics, 2019, 25(4): 483-491. doi: 10.12090/j.issn.1006-6616.2019.25.04.046
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RESEARCH ON THE INFLUENCE OF THE COUPLING EFFECT OF SEEPAGE AND STRESS ON RESERVOIR FRACTURES

  • 1.

    CNOOC Research Institute Co. Ltd., Beijing 100028, China

  • 2.

    Institute of Geological Mechanics and Engineering, China University of Petroleum, Qingdao 266580, Shandong, China

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Received Date:  15 September 2018
Revised Date:  10 April 2019
    Abstract
  • Fracture is an important factor affecting the high and stable yield of reservoir, which lies in a complex geological environment. The formation and development of fractures are influenced by numerous factors; therefore, it is of great significance to study the effect of coupling among factors on reservoir fracture development for guiding petroleum exploration and development. In this study, the effect of seepage-stress coupling on fracture development of Wumishan Formation carbonate reservoir in Well Ren 11 area of Renqiu Oilfield is studied, and the results show that:Without considering the seepage-stress coupling effect, the maximum horizontal principal stress in the study area ranges from 82 MPa to 100 MPa, which gradually increases from southwest to northeast; the minimum horizontal principal stress ranges from 72 MPa to 88 MPa, which gradually increases from the center of the study area to the southwest and northeast. After considering the coupling effect, the maximum horizontal principal stress ranges from 84 MPa to 102 MPa, and the minimum from 76 MPa to 91 MPa. The horizontal principal stress increases after seepage-stress coupling is considered. After the coupling effect, fracture development index of the study area is mainly distributed between 0.027 and 1.156. The fracture development index of the top of the hilltop and the inner area of near the W-E fault is about 0.7, which is a relatively developed area, while the fracture development index of southwest and northeast marginal areas is less than 0.2, which is considered to be an underdeveloped area. With the increase of coupling time, the reservoir fracture development index increases gradually and it increases obviously in the area near the injection well and the oil production well. The fracture linear density of the whole reservoir also shows an increasing trend, only the fracture linear density around the oil production well shows a tendency to decrease first and then increase; The fracture parameters in the reservoir without consideration of coupling effect are smaller than that with consideration, which indicates that the results obtained from fracture prediction only based on stress field are on the small side.
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