地物测井在煤层划分中的应用

Application of Geophysical Logging in Coal Seam Division

地物测井主要用于测定煤、岩层的物性参数。为了准确有效地进行煤层划分和对比,以贵州水城县某煤矿为实例,分析自然电阻率测井、自然伽马及伽马伽马测井曲线特征,确定了煤层的厚度、深度及煤质特征。通过研究自然电阻率曲线、自然伽马曲线特征,发现4个物性特征明显的地层,均显示明显的高电阻率异常和自然伽马低异常的特征,因此选取这4个地层作为物性标志层。以所建立的物性标志层为依据,对全区煤层划分对比,为进一步煤层资源量估算和勘探、开发提供参考。

Geophysical logging can be used in evaluating the physical characteristics of rock or coal formations. These physical characteristics combined with other geological materials can provide accurate and effective evidence for seam division and contrasting. Taking a coal mine in Shuicheng county, Guizhou province as an example, natural resistivity, nature rays and gamma gamma logging curves applied to interpret the thickness and depth of coal seams and to study the coal quality. Otherwise, natural resistivity, nature rays curves showed that there are four physical signs layers which have an obverse high resistivity abnormal and low nature rays abnormal. Based on these four physical signs layers, segmentation of coal seams can be carried out in the whole studding area. For further it can provide reference for coal resources estimation and further exploration.