Finite element simulation for fracturing monitoring of oil and gas reservoirs by using contact induced polarization method
LI Jinghe1,2, HE Zhanxiang2,3,4, MU Tong1
1. College of Earth Sciences, Guilin University of Technology, Guilin, Guangxi 541004, China; 2. Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Shenzhen, Guangdong 511458, China; 3. Shenzhen Key Laboratory of Deep Offshore Oil and Gas Exploration Technology, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China; 4. Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
Abstract:The exploration target which can access currents through natural or artificial outcrops is an important research object in geophysical exploration, and it is common in minerals, oil and gas, hydrological engineering, and environmental geophysics. However, it is a challenging task to efficiently and accurately simulate the spatial response distribution of targets with access to currents. Therefore, on the basis of the fracturing monitoring problem of oil and gas reservoirs, this paper proposes a three-dimensional finite element (FE) numerical simulation technology for the contact induced polarization method. The contact induced polarization method adopts the observation system with contact power supply and ground measurement, and the direct power supply can effectively improve the intensity and precision of observed signals. The current distribution of a unit field source of discrete grids is calculated by tetrahedron subdivision of staggered grids, and the three-dimensional numerical simulation of a contact field source is realized by the FE method. The formula for calculating the apparent resistivity of the contact induced polarization method is defined. In addition, we design the field sources, physical soil trough test simulation, and fracturing monitoring models of coalbed methane (CBM) reservoirs in Qinshui Basin of different methods, and the numerical results are compared and analyzed with the observation data of traditional induced polarization me-thods. The results verify the feasibility and effectiveness of the application of the contact induced pola-rization method in oil and gas reservoir fracturing monitoring.
李静和, 何展翔, 穆桐. 接触式激发极化法油气储层压裂监测有限元模拟[J]. 石油地球物理勘探, 2022, 57(3): 719-727.
LI Jinghe, HE Zhanxiang, MU Tong. Finite element simulation for fracturing monitoring of oil and gas reservoirs by using contact induced polarization method. Oil Geophysical Prospecting, 2022, 57(3): 719-727.
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