Geometry of Hydraulic Fractures in Fractured Horizontal Wells in Shale Reservoirs of Jimsar Sag，Junggar Basin

doi:10.7657/XJPG20240110

Abstract

Abstract:

The side-view images of microseismic monitoring in horizontal wells in the shale reservoirs in the Jimsar sag of Junggar basin and in the southern Sichuan basin exhibit a phenomenon that the density and extent of the data points parallel to bedding direction are much greater than those perpendicular to the bedding direction. This phenomenon contradicts the hydraulic fracture interpretation results from conventional processing. However，there is no clear explanation for this phenomenon in terms of 3D geometry of hydraulic fractures. A method of microseismic inversion was established，and the inversion results were reconstructed to obtain 3D geometry of the fractures induced by horizontal well hydraulic fracturing in shale reservoirs. Finally，the fracture geometry and the microseismic inversion method were verified through physical simulation experiments on fracturing under true triaxial stress. The results show that the fractures from inversion primarily exhibit a geometrical pattern of one main fracture intersecting with multiple secondary fractures in three dimensional space. Combining with the results of fracturing physical simulation experiments under true triaxial stress，it is found that the hydraulic fractures are horizontally and vertically intersected. The results of acoustic emission experiments and the fracture geometry presented after true-triaxial fracturing physical simulation of outcrop samples from the Jimsar sag validate that the microseismic inversion method is reliable and the fractures induced by horizontal well hydraulic fracturing in shale reservoirs are complex.

Key words: Junggar basin, Jimsar sag, shale, horizontal well, reservoir, microseismic, hydraulic fracturing, fracture geometry

CLC Number:

TE357

FANG Zheng, CHEN Mian, WANG Su, LI Jiacheng, LYU Jiaxin, YU Yanbo, JIAO Jibo. Geometry of Hydraulic Fractures in Fractured Horizontal Wells in Shale Reservoirs of Jimsar Sag，Junggar Basin[J]. Xinjiang Petroleum Geology, 2024, 45(1): 72-80.

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基本力学参数	数值	压裂实验参数	数值
弹性模量/GPa	29.95	水平地应力差/MPa	8
泊松比	0.23	最大水平主应力/MPa	26
单轴抗压强度/MPa	23.97	最小水平主应力/MPa	18
单轴抗拉强度/MPa	1.64	上覆应力/MPa	28
渗透率/mD	0.11	排量/（mL·min^-1）	30
孔隙度/%	6.45