Numerical simulation investigation and geological guided inversion method research of electromagnetic wave resistivity instruments for LWD in anisotropic formations

XiaoLei CHEN, BaoYin LIU, Jun ZHOU, ZhongQing ZHANG, ZhengZhi ZHOU, BaoHua MAO, Juan ZHANG, Yue WU

Prog Geophy ›› 2025, Vol. 40 ›› Issue (1) : 188-198.

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Prog Geophy ›› 2025, Vol. 40 ›› Issue (1) : 188-198. DOI: 10.6038/pg2025II0063

Numerical simulation investigation and geological guided inversion method research of electromagnetic wave resistivity instruments for LWD in anisotropic formations

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Abstract

The electromagnetic wave resistivity logging tool for Logging While Drilling(LWD) is one of the most widely used logging tools in horizontal well development. However, the anisotropy of the formation and the distance between the surrounding rock and the boundary in the horizontal well environment can cause distortion in the electromagnetic wave resistivity measurement values, leading to the common problem of low drilling rate in the development of thin reservoirs. In this paper, taking the electromagnetic wave LWD resistivity tool of CNLC as an example, the numerical simulation method is used to investigate the instrument response law in the horizontal well formation, and the characteristic signals indicating the boundary distance and anisotropy of the formation are defined and quantified, and the combination of characteristic signals and classification inversion is used to realize the quantitative calculation of the anisotropy and multiple boundary distances of the conventional electromagnetic wave LWD resistivity tool in complex formations. The boundary distance, horizontal resistivity and vertical resistivity calculated by inversion are consistent with the changes in borehole trajectory, the response characteristics of logging curves and the formation occurrence information displayed by borehole imaging, which verifies the rationality of the method. This method is suitable for obtaining boundary distance, anisotropy and formation resistivity parameters from conventional LWD instruments, quantifies the boundary detection ability of conventional electromagnetic wave resistivity instruments, provides a new idea for precise geological guidance of thin-bedded and complex oil and gas reservoirs, and provides a technical method for the fine evaluation of post-drilling formations, and has great potential application value.

Key words

Logging While Drilling(LWD) / Resistivity / Anisotropy / Inversion / Geological orientation

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XiaoLei CHEN , BaoYin LIU , Jun ZHOU , et al . Numerical simulation investigation and geological guided inversion method research of electromagnetic wave resistivity instruments for LWD in anisotropic formations[J]. Progress in Geophysics. 2025, 40(1): 188-198 https://doi.org/10.6038/pg2025II0063

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