福建尤溪剑溪矿区复煤层钻探与测井厚度误差原因分析

Error analysis of the thickness of compound coal seams determined by drilling and geophysical logging of Jianxi mining area in Youxi County of Fujian Province

煤田勘探中煤层定性、定厚及结构分析主要通过钻探岩、煤芯采取率,测井曲线和煤质化验成果综合判定。主要对剑溪矿区2个钻孔5个复杂煤层,从钻探与测井2个方面对比分析其厚度、煤层结构、煤质等特征,并对测井曲线在煤层定厚过程普遍产生较大误差,甚至出现误判原因进行探讨,从而提高煤田测井中煤层判层、定厚的准确性,更好地为煤炭资源勘查服务。

The properties, thicknesses and structures of coal seams are comprehensively determined by recovery rate of cores, coal cores and logging curves together with the measurement of coal quality. Taking the five complex coal seams from two drill holes in the Jianxi mining area of Fujian as an example, this work analyzed their thicknesses, structures and quality, and discussed the reason for the commonly great errors of coal seam thickness determined by logging curves. This result can improve the accuracy in predicting the coal seams and their thicknesses, and may also benefit the exploration of coal resources.