Abstract
When the acoustic field propagates in the porous medium, the electromagnetic wave can be induced by the seismoelectric effects which can be used in the logging. This paper studies the seismoelectric wave field and deduces the formulations of the acoustic and electromagnetic field of the liquid in the well, and gives the acoustic and electromagnetic boundary conditions between the driller collar and the log liquid, when the driller collar is added. We also do the numerical simulation of the seismoelectric wave field excited by monopole source, study the velocity dispersion characteristics of the acoustic and electromagnetic field, and investigate the detective depth of the seismoelectric logs. Through the simulation we know the seismoelectric logs can avoid the interference of drill collar wave. This paper also provides theoretical guidance for the design of receiving antenna.
Highlights
With the development of the world economy, the shortage of oil and gas has become the main restricting factor of economic and social development[1].And the oil and gas are mainly stored in the porous media[2].So the application of seismoelectric effects in the exploration of oil and gas is very promising, especially in the search of “remaining oil"[3]
A simplified method for Seismoelectric logs is proposed by Hu Hengshan and Liu Jiaqi, which ignores the influence of electromagnetic field and solve the acoustic field independently first, and solve the electromagnetic field by using seismic and electric coupling relationship[4,5]
Where a j is the coefficient of Hertz vector potential. bj is the the electromagnetic wave induced by the acoustic field in the porous medium
Summary
With the development of the world economy, the shortage of oil and gas has become the main restricting factor of economic and social development[1].And the oil and gas are mainly stored in the porous media[2].So the application of seismoelectric effects in the exploration of oil and gas is very promising, especially in the search of “remaining oil"[3]. Seismoelectric effects refer to the excitation of electromagnetic wave excited by the seismic wave in the porous medium, It is a process of energy conversion between mechanical energy and electromagnetic energy in nature. Seismoelectric logs have better recognitive ability of oil and gas, and better detective ability than pure electric logging and seismic logging. A simplified method for Seismoelectric logs is proposed by Hu Hengshan and Liu Jiaqi, which ignores the influence of electromagnetic field and solve the acoustic field independently first, and solve the electromagnetic field by using seismic and electric coupling relationship[4,5]. Jin Zhiwen derived the expressions of the acoustic and the electromagnetic field in the porous medium excited by the multipole source[7]. Solution of the seismoelectric field and study the propagating characteristics of the acoustic and the electromagnetic field. We obtain the velocity dispersion characteristics of the seismoelectric field, and investigate the detective depth of the seismoelectric logs
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