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Logging-Constrained Pseudo 2D Inversion of Borehole-surface EM Data and a Case Study
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 73rd EAGE Conference and Exhibition incorporating SPE EUROPEC 2011, May 2011, cp-238-00545
- ISBN: 978-90-73834-12-5
Abstract
Due to the fact that vertical resolution of EM responses decreases rapidly with depth because of skin effect, it is difficult to detect a thin target buried at a depth of thousands of meters with a thickness of dozens of meters. In this paper we present a logging-constrained 1D inversion of BSEM data. First, an initial 2D resistivity model is generated using logging data and seismic data. Then , an Occam’s inversion is performed using the initial model as constraints. The inversion focuses on the deep target layer, and the inversion results of previous sites are used as references for the following sites. Finally, the results of 1D constrained inversion of BSEM data are obtained at the target layer. The applied inversion is also called pseudo 2D inversion. The inversion results of synthetic data match the original model well, and the inversion results of a real data set are consistent with known information, suggesting that the applied inversion algorithm and program of BSEM data are correct and effective.