A Study on Downhole Complex and Three Dimensional Distribution of Fractures in Changning Shale Formation

doi:10.11885/j.issn.16745086.2021.04.29.05

Abstract

Abstract: The Changning Block is rich in shale gas reserves in the Longmaxi Formation and is an important support point for China's oil and gas resources to increase production. However, the frequent occurrence of well leaks and blocking accidents in the drilling of shale reservoirs in the Changning Block has hindered the process of beneficial development of shale gas resources in the area. By combing the complex information data of drilled wells in the key well areas of the Changning Block, the ant-tracking method was used to predict the fracture development and 3D spatial spreading pattern of the shale formation based on the 3D seismic data body of the block, and the response relationship between well leakage, jamming complexity and fracture development was comparatively studied to lay the foundation for early warning and safe drilling of horizontal shale drilling wells in the Longmaxi Formation of the Changning Block. The results show that the fracture prediction method based on ant body is better applied in the Changning Block, the response between well leakage complexity and fracture prediction results is high, and fracture development, cross penetration of oblique intersection and laminated joints are the main causes of well leakage and jamming accidents. The fracture development in the shale of the Maokou and Wufeng Formations has threedimensional spatial variability, and the well leakage and jamming complexity is more prominent in the high tectonic areas and near large faults where fractures are developed and the rock is more fragmented. The results of the study explain the causes of well leakage and blocking complexities in the Changning Block and predict the three-dimensional fracture spreading pattern in the Changning Block, which can provide a scientific basis for the prediction of downhole complexities and the formulation of prevention and control measures in the Changning Block at a later stage.

Key words: ant body, fracture prediction, downhole complex, Changning Block, Longmaxi Formation shale

CLC Number:

TE21

LIU Houbin, YU Xingchuan, ZHANG Zhen, WAN Xiumei, SUN Hangrui. A Study on Downhole Complex and Three Dimensional Distribution of Fractures in Changning Shale Formation[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(4): 208-218.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.16745086.2021.04.29.05

http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2021/V43/I4/208

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