Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (4): 35-43.doi: 10.12108/yxyqc.20240404

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Natural fracture characteristics and fracture network simulation in shale reservoirs of Permian Lucaogou Formation in Jimsar Sag

XU Tianlu1, WU Chengmei1, ZHANG Jinfeng1, CAO Aiqiong2, ZHANG Teng3   

  1. 1. Jiqing Oilfield Operation Area, PetroChina Xinjiang Oilfield Company, Jimsar 831700, Xinjiang, China;
    2. Xinjiang Zhundong Petroleum Technology Co., Ltd., Fukang 831511, Xinjiang, China;
    3. Yuanwang Jingsheng Technology (Beijing) Co., Ltd., Beijing 100020, China
  • Received:2023-06-21 Revised:2023-07-11 Online:2024-07-01 Published:2024-07-04

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Abstract: Based on core，seismic，logging，and microseismic monitoring data，and under the constraints of natural fracture models and geostress models，the characteristics of natural fractures and their impact on the expansion of fracture networks in Permian Lucaogou Formation in Jimsar Sag were studied through fracture network simulation in shale reservoirs. The results show that：（1）The natural fractures of Permian Lucaogou Formation in Jimsar Sag include bedding fractures and structural fractures，with the bedding fractures as the main type，having a large number and small dip angles. The average number of fractures is 251，and the fracture surface density is 0.58-1.34 per meter，with an average of 0.93 per meter. The dip angle of the structural fractures is 70°-95°，and the number of fractures is significantly less than that of the bedding fractures. According to the formation time and occurrence，the structural fractures can be divided into type Ⅰ and type Ⅱ structural fractures. （2）The minimum horizontal principal stress in the study area is 50.41-55.22 MPa，and the maximum horizontal principal stress is 53.52-74.43 MPa，which is conducive to the extension of hydraulic fracturing network. There are stress barriers in the vertical direction of Lucaogou Formation，and the maximum interlayer stress difference can reach 12 MPa，so it is not easy for the artificial fracture to penetrate the layers during hydraulic fracturing. （3）The fracturing transformation of shale of Lucaogou Formation in the study area is mainly to activate the highangle structural fractures. 96.45% of the fracturing fractures are“T-shaped”，while the“cross-shaped”and “straight -shaped”fractures only account for 2.24% and 1.21%，respectively. The half-length of the fractures of Lucaogou Formation is 70-100 meters，and the height is 10-30 meters. When adjacent to faults，due to the excessive fracture length，well-channeling is prone to occur.

Key words: shale reservoir, hydraulic fracturing, natural fracture, bedding fracture, structural fracture, fracturing extension simulation, Lucaogou Formation, Permian, Jimsar Sag

CLC Number: 

  • TE319
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