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| IP characteristics and anisotropy experiment of hydraulic fracturing shale |
| TONG Xiaolong1,2, YAN Liangjun2, XIANG Kui2, TAN Gongxian2 |
1. Key Laboratory of Drilling and Production Engineering for Oil and Gas, Hubei Province, Wuhan, Hubei 430100, China;
2. Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Yangtze University, Wuhan, Hubei 430100, China |
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Abstract Hydraulic fracturing is the core technology to improve the physical properties of unconventional reservoirs and effectively develop unconventional oil and gas resources.Different from microseismic monitoring, the electromagnetic monitoring method has a better physical basis based on the complex resistivity differences between fracturing fluids and surrounding rocks.The fractured reservoirs formed by hydraulic fracturing of tight shale and other unconventional reservoirs have complex structures and often have various induced polarization (IP) mechanisms, which causes certain difficulties in IP modeling of actual formations and limits the evaluation of electromagnetic fracturing monitoring.Therefore, this paper carries out IP modeling based on dual pore media and combines the IP characteristics of tight shale in Wufeng Formation before and after fracturing with the experiment.The differences in IP parameters and anisotropy characteristics of reservoir samples before and after fracturing are analyzed in the condition of different pressure, saturation, and proppant filling.The results show that the IP physical features of fractured reservoirs after fracturing are greatly affected by the fracture surface, and the enhanced pore connectivity of reservoirs is the main reason for the resistivity decrease.Meanwhile, the directional distribution of proppants is beneficial to enhance the anisotropy of fractured reservoirs, which provides a theoretical and experimental basis for IP modeling of reservoirs.
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Received: 12 February 2022
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2023, Vol. 58 
