Numerical Simulation Study on the Influence of Cracks in a Full-Size Core on the Resistivity Measurement Response

Hanwen Zheng, Zhansong Zhang (), Jianhong Guo, Sinan Fang and Can Wang
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Hanwen Zheng: College of Geophysics and Petroleum Resources, Yangtze University, Wuhan 430100, China
Zhansong Zhang: College of Geophysics and Petroleum Resources, Yangtze University, Wuhan 430100, China
Jianhong Guo: College of Geophysics and Petroleum Resources, Yangtze University, Wuhan 430100, China
Sinan Fang: College of Geophysics and Petroleum Resources, Yangtze University, Wuhan 430100, China
Can Wang: Hydrogeology and Engineering Geology Institute of Hubei Geological Bureau, Jingzhou 434007, China

Energies, 2024, vol. 17, issue 6, 1-18

Abstract: The development of fractured oil fields poses a formidable challenge due to the intricate nature of fracture development and distribution. Fractures profoundly impact core resistivity, making it crucial to investigate the mechanism behind the resistivity response change in fracture cores. In this study, we employed the theory of a stable current field to perform a numerical simulation of the resistivity response of single-fracture and complex-fracture granite cores, using a full-size granite core with cracks as the model. We considered multiple parameters of the fracture itself and the formation to explore the resistivity response change mechanism of the fracture core. Our findings indicate that, in the case of a core with a single fracture, the angle, width, and length of the fracture (fracture occurrence) significantly affect core resistivity. When two fractures run parallel for a core with complex fractures, the change law of core resistivity is similar to that of a single fracture. However, if two fractures intersect, the relative position of the two fractures becomes a significant factor in addition to the width and length of the fracture. Interestingly, a 90° difference exists between the change law of core resistivity and the change law of the resistivity logging response. Furthermore, the core resistivity is affected by matrix resistivity and the resistivity of the mud filtrate, which emphasizes the need to calibrate the fracture dip angle calculated using dual laterolog resistivity with actual core data or special logging data in reservoirs with different geological backgrounds. In the face of multiple fractures, the dual laterolog method has multiple solutions. Our work provides a reference and theoretical basis for interpreting oil and gas in fractured reservoirs based on logging data and holds significant engineering guiding significance.

Keywords: fractured reservoir; core resistivity; numerical simulation; fracture occurrence; logging interpretation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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