Simulation of the borehole quasistatic electric field excited by the acoustic wave during logging while drilling due to electrokinetic effect

Zheng, Xiongfei; Hu, Hengshan; Guan, Wei; Jun, Wang

doi:10.1190/geo2014-0506.1

Cited by 16 publications

(6 citation statements)

References 31 publications

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“…By comparing Figure 2a,b, Figure 4a,b and Figure 6a,b, it can be found that the electric field in the electrokinetic logging while drilling in the oil-wetted porous formation with dual phase fluid is much less affected by the drill collar wave than the acoustic field, which is an advantage of electrokinetic logging. This is consistent with the research results of saturated porous medium [14,15]. At the same time, it can also be found that under the excitation of dipole source, the influence of drill collar wave can be almost ignored.…”

Section: Discussionsupporting

confidence: 91%

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Seismoelectric Coupling Equations of Oil-Wetted Porous Medium Containing Oil and Water

2023

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For porous medium containing multiphase fluid, such as oil-wetted porous medium with oil–water dual phase fluid, its fluid interface will also produce electric double layer (EDL), which will play a role in the seismoelectric effects. At this time, the principle of seismoelectric effects is more complex. The existing theory for the seismoelectric effects is the Pride theory used in the water-saturated porous formation, which cannot meet the actual needs of the theoretical research of seismoelectric exploration in the porous formation with multiphase fluid. Carbonate porous formations are often oil-wetted; therefore, it is necessary to study the electrokinetic effects of oil-wetted porous medium containing multiphase fluid. In this paper, we treated the oil–water mixture as an effective fluid, and solved the effective elastic parameters and extended the Biot equations to the case of oil-wetted porous medium with oil–water dual phase fluid. We calculated the effective electromagnetic parameters and derived the macroscopic coupling equations of seismoelectric effects and electroseismic effects, and proposed the new electrokinetic coupling coefficients of the oil-wetted porous medium with dual phase fluid. We also deduced the coupling functions of electric and magnetic fields relative to the solid displacement in the homogeneous porous medium, and studied the polarization characteristics of the electric field. We use the derived coupling equations to simulate the seismoelectric logging while drilling in the model of oil-wetted porous formation with dual phase fluid under the excitation of multipole sources. The influence of drill collar wave on the acoustic field and electric field under the excitation of different sources was investigated, which has a certain guiding role in the selection of electrokinetic logging tools.

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Section: Discussionsupporting

confidence: 91%

“…Guan's research indicates that the electric field is less affected by the drill collar wave in the electrokinetic logging while drilling in saturated porous formation. In 2015, Zheng conducted a similar study using the quasi-static field method and obtained the same conclusion [15].…”

Section: Introductionmentioning

confidence: 73%

Seismoelectric Coupling Equations of Oil-Wetted Porous Medium Containing Oil and Water

2023

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“…This slow convergence problem also affects the numerical simulation of elastic waves in stratified solid media (e.g., Apsel & Luco, 1983; Bouchon & Aki, 1977; Chen, 1999; Kennett, 1983; Yao & Harkrider, 1983). Classic methods for modeling the wave‐fields inside a borehole, for instance, real‐axis integration method (e.g., Tsang & Rader, 1979; Zheng et al., 2015), and discrete wavenumber method (e.g., Cheng & Toksöz, 1981), can also encounter the same problem (e.g., Parra et al., 1993). Two methods have been proposed to solve this problem.…”

Section: Problem Analysismentioning

confidence: 99%

Seismoelectric and Electroseismic Modeling in Stratified Porous Media With a Shallow or Ground Surface Source

et al. 2021

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For a shallow or ground surface source and receiver at the same level or close depth, it is very difficult or computationally inefficient to simulate seismoelectric or electroseismic wave‐fields in stratified porous media by current reflectivity methods, such as the Luco‐Apsel‐Chen generalized reflection and transmission method (LAC GRTM). In this work, the peak‐trough averaging method which has been proved effective and efficient in dealing with this kind of computational problem is adopted to update the seismoelectric and electroseismic modeling algorithm based on LAC GRTM. After thoroughly verifying the accuracy and computational efficiency of the updated algorithm, we utilize it to numerically investigate both the electroseismic and seismoelectric couplings. Snapshots of electroseismic wave‐fields indicate evanescent electroseismic conversion, a reverse process of evanescent seismoelectric conversion, dominates at relatively larger ratios of seismic wavelength to interface depth, whereas the interfacial radiation electroseismic conversion is more prominent for the opposite situation. Our seismoelectric modeling results demonstrate that electric signals can arrive at the ground surface a few milliseconds earlier than their causative seismic signals due to evanescent seismoelectric conversion. This is the first modeling result considering source‐receiver geometries on the surface capable of explaining similar phenomena reported in geophysical field observations of seismically induced electrokinetic effects over a long history. The updated algorithm offers an accurate and efficient tool for forward modeling and will benefit interpretations of field observations as well as future inversion studies.

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“…They calculated ES and SE logging responses to estimate the parameters of the porous medium around the borehole. A variation of this numerical technique was employed recently by Zheng et al [2015] when simulating the electric field excited by the acoustic wave in a logging while drilling scenario. Two dimensional numerical tests about P-TM conversions using an implicit time stepping finite element algorithm in a commercial software were implemented by Kröger et al [2014], while Zhou et al [2014] studied converted waves inside a borehole setting boundary conditions at the interface between fluid and porous media.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Modeling of Electroseismics and Seismoelectrics

Zyserman

Gauzellino

Jouniaux

2020

Geophysical Monograph Series

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In this chapter we describe a set of finite element formulations employed to approximate the solution to an extension to partially saturated porous media of Pride's equations, which is one of the most widespread theoretical frames that model the coupled electromagnetics and acoustics of saturated porous media. We also show how these numerical algorithms can be implemented on multi-core computers, and analyse their performance, observing that the parallel efficiency of the algorithms decays slower when the resources of each computing core are used as close to their maximum as possible. Further, we perform a study of two dimensional PSVTM electroseismic conversions in a time-lapse carbon dioxide geological deposition monitoring scenario, setting the electromagnetic source in depth, and measuring the seismic responses both in wells and at the surface. We observe that, contrary to what is known from standard field settings, the interface responses play no important role in elucidating the CO 2 plume behaviour, and that the in-depth converted signals convey information about the carbon dioxide saturation in the plume.

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Simulation of the borehole quasistatic electric field excited by the acoustic wave during logging while drilling due to electrokinetic effect

Cited by 16 publications

References 31 publications

Seismoelectric Coupling Equations of Oil-Wetted Porous Medium Containing Oil and Water

Seismoelectric Coupling Equations of Oil-Wetted Porous Medium Containing Oil and Water

Seismoelectric and Electroseismic Modeling in Stratified Porous Media With a Shallow or Ground Surface Source

Finite Element Modeling of Electroseismics and Seismoelectrics

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