Detection performance of the azimuthal electromagnetic wave logging instrument at coal-rock interface in horizontal wells

Authors

ZHANG Yi, China Coal Research Institute, Beijing 100013, China; Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, ChinaFollow
KANG Zhengming, School of Electronic Engineering, Xi’an Shiyou University, Xi’an 710065, ChinaFollow
FENG Hong, Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, China
HAN Xue, China Petroleum Group Logging Co. LTD, Xi’an 710077, China
LI Fei, School of Electronic Engineering, Xi’an Shiyou University, Xi’an 710065, China
LI Xin, SINOPEC Petroleum Engineering Technology Research Institute, Beijing 100101, China

Abstract

The advance and accurate identification of coal-rock interfaces is one of the key technologies to realize intelligent mining, improve mining efficiency and reduce cost. Azimuthal electromagnetic wave logging has achieved good results in lithologic interface identification of petroleum logging, but the identification of coal-rock interface is seldom studied. For the purpose of studying the applicability and detection performance of azimuthal electromagnetic wave in the coalfield logging environment, the one-dimensional generalized reflection coefficient method is used to calculate the magnetic field component, and the fast Hankel transform is used to accelerate the integral calculation speed. What is more, the effects of coil system combination mode, frequency, source distance, radius of coil system, resistivity contrast, emission current and resistivity anisotropy on azimuth electromagnetic logging response in the coal field are simulated. The results show that the azimuthal electromagnetic wave logging instrument can distinguish the coal-rock interface and has a great application potential in coal-rock interface recognition. The radius of the coil system and the emission current mainly affect the size of the instrument response signal. In a certain range of resistivity contrast, the amplitude ratio and phase difference near the interface increase with the increase of resistivity contrast, and the resistivity anisotropy has little effect on the amplitude ratio and phase difference in high resistivity formation. The transmitting frequency, source distance and resistivity contrast of the instrument simultaneously affect the maximum edge depth of the azimuth signal.

Keywords

azimuth electromagnetic wave logging, coal-rock interface, horizontal well, forward modeling

DOI

10.12363/issn.1001-1986.21.06.0334

Recommended Citation

ZHANG Yi, KANG Zhengming, FENG Hong, et al. (2022) "Detection performance of the azimuthal electromagnetic wave logging instrument at coal-rock interface in horizontal wells," Coal Geology & Exploration: Vol. 50: Iss. 2, Article 18.
DOI: 10.12363/issn.1001-1986.21.06.0334
Available at: https://cge.researchcommons.org/journal/vol50/iss2/18

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