当岩层厚度不大时,用普通视电阻率测井(如梯度电极系或电位电极系视电阻率测井)很难准确确定岩层电阻率和划分岩层界面。这是因为,普通视电阻率测井结果受围岩及泥浆的影响严重,而这些影响又很难进行校正的缘故。因此,用普通视电阻率测井曲线来进行岩性和煤质的计算机定量分析, When the thickness of the rock is not large, it is very difficult to accurately determine the resistivity of the rock formation and to divide the rock formation interface with ordinary apparent resistivity logging (such as gradient electrode system or potential electrode system apparent resistivity logging). This is because ordinary resistivity logging results are severely affected by wall rock and mud and these effects are difficult to correct. Therefore, using general apparent resistivity logging curve to conduct computer quantitative analysis of lithology and coal quality,