煤田地质与勘探2025，Vol.53Issue(11)：44-52,9.DOI:10.12363/issn.1001-1986.25.05.0380
高阻煤层随钻电磁波方位探测能力研究
Logging-while-drilling azimuthal electromagnetic measurements for high-resistivity coal seams
摘要
Abstract
[Objective and Method]To determine the boundary detection capability of logging-while-drilling(LWD)electromagnetic azimuthal measurements for high-resistivity coal mines,this study simulated geosignal responses under varying operating frequencies,transmitter-receiver coil spacing conditions,and formation resistivity values.Then,key parameters for boundary detection for high-resistivity coal seams were optimized.Accordingly,this study proposed design schemes for LWD instruments with short(<80 inches)and long(approximately 240 inches)transmitter-receiver coil spacing for short-distance(2.032 m)and long-distance(6.096 m)detection,respectively.[Results and Conclu-sions]LWD electromagnetic azimuthal measurements exhibit a significantly decreased depth of detection(DOD)in high-resistivity coal seams compared to that in low-resistivity hydrocarbon reservoirs.Consequently,the existing methods for selecting the operating frequency and transmitter-receiver coil spacing are no longer applicable.In high-resistivity coal seams,increasing the operating frequency and transmitter-receiver coil spacing appropriately can enhance the strength and DOD of geosignals.Under transmitter-receiver coil spacing of 50‒85 inches(1.270‒2.159 m)and an operating fre-quency of(2‒5)MHz,the DOD can reach 3 m,meeting the need for roof and floor detection.When the transmitter-re-ceiver coil spacing increases to 5 m and the operating frequency decreases to 200‒400 kHz,the DOD of electromagnetic signals in high-resistivity coal seams can extend to 10 m,offering a foundation for long-distance detection of low-res-istivity anomalies.关键词
随钻电磁波测井/边界探测/高阻煤层/地质导向/参数优选Key words
logging while drilling(LWD)of electromagnetic measurement/boundary detection/high-resistivity coal seam/geosteering/parameter optimization分类
天文与地球科学引用本文复制引用
赵伟娜,郑东方,艾维平,谢夏..高阻煤层随钻电磁波方位探测能力研究[J].煤田地质与勘探,2025,53(11):44-52,9.基金项目
山东省自然科学基金项目(ZR2023QA07) （ZR2023QA07）
中国石油青年科技专项项目(2024DQ03113) （2024DQ03113）
