A Comparative View on Integral Equation Approximations for Forward Modeling of Marine CSEM Data
عنوان دوره: پنجمین همایش ژئوفیزیک اکتشافی نفت
نویسندگان
1موسسه ژئوفیزیک دانشگاه تهران
2موسسه ژئوفیزیک، دانشگاه تهران
چکیده
One of the Electromagnetic inductions (EMI) techniques for submarine hydrocarbon reservoirs detection is the control source electromagnetic (CSEM) method. Despite the fact that the marine CSEM method has less accurate compared to the seismic reflection measurements, it has reduced the cost of modeling and has relatively high coverage speed. In this research, for 3D forward modeling of a hydrocarbon reservoir with regular and irregular geometrical shape, integral equation (IE) method are used. Whereas, for solving full integral equations high performance computers are needed, and these computational costs are not affordable, approximations are usually used to solve the electromagnetic problems. The aim of the present study is to apply and compare several approximation methods to solve integral equation for 3D CSEM synthetic data in order to avoid solving full integral equations. These approximation methods consist of T-matrix approximation (TMA), Extended Born approximation (EBA) and Born approximation (BA). To numerically verify the performance of the proposed approximations, the methods are tested on 3D forward modeling of two synthetic models in MATLAB software. Our results show that the T-Matrix approximation have better accuracy and a wider electrical conductivity application range.
کلیدواژه ها
 
Title
A Comparative View on Integral Equation Approximations for Forward Modeling of Marine CSEM Data
Authors
Maryam Bayat, Reza Ghanati
Abstract
One of the Electromagnetic inductions (EMI) techniques for submarine hydrocarbon reservoirs detection is the control source electromagnetic (CSEM) method. Despite the fact that the marine CSEM method has less accurate compared to the seismic reflection measurements, it has reduced the cost of modeling and has relatively high coverage speed. In this research, for 3D forward modeling of a hydrocarbon reservoir with regular and irregular geometrical shape, integral equation (IE) method are used. Whereas, for solving full integral equations high performance computers are needed, and these computational costs are not affordable, approximations are usually used to solve the electromagnetic problems. The aim of the present study is to apply and compare several approximation methods to solve integral equation for 3D CSEM synthetic data in order to avoid solving full integral equations. These approximation methods consist of T-matrix approximation (TMA), Extended Born approximation (EBA) and Born approximation (BA). To numerically verify the performance of the proposed approximations, the methods are tested on 3D forward modeling of two synthetic models in MATLAB software. Our results show that the T-Matrix approximation have better accuracy and a wider electrical conductivity application range.
Keywords
MCSEM, BA, EBA, TMA, Integral equation, Green’s function