Three-dimensional cross-well electromagnetic inversion using the least-square method
Li Jinghe1,2, He Zhanxiang2
1. Institute of Geophysics and Geomatics, China University of Geosciences (Wuhan), Wuhan, Hubei 430074, China; 2. BGP Inc., CNPC, Zhuozhou, Hebei 072751, China
Abstract:Practical applications of cross-well electromagnetic depend on three-dimensional effective simulation and interpretation. Using three-dimensional integral equation methods, we simulate a three-dimensional oil-gas model with variant spatial position. It is found that electromagnetic anomalous in different wells have different morphological characteristics. So three-dimensional inversions for cross-well electromagnetic are needed. Then inversions of four performance of waterflooding operation with variant-resistivity models and variant-resistivity strata are realized with least-square method. The result shows that three-dimension cross-well electromagnetic inversion with the least-square method can map spatial distribution of reservoir resistivity and strata resistivity, and their parameters. This will provide a new approach for dynamic process monitoring in oil and gas production.