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煤层裂缝性质与双侧向曲线差异的大小、正负有着定性和定量的关系。一般高角度裂缝在双侧向曲线上表现为正差异， 低角度裂缝表现为负差异， 斜交缝表现为无差异或小的正、负差异。用立方体模型近似模拟煤层基岩块体， 利用该模型求出裂缝孔隙度后， 给出垂直裂缝开度、裂缝间距以及裂缝渗透率的计算公式。通过对山西屯留地区和寿阳地区煤层气井的测井解释， 并与分析结果对比， 证明应用效果良好。
The nature of the fracture and the difference between the two lateral curves have a qualitative and quantitative relationship between positive and negative. Generally, high-angle fractures show positive differences in bilateral curves, low-angle fractures show negative differences, and oblique fractures show no or small positive and negative differences. The cubic model is used to simulate the bedrock of coal seam. After the fracture porosity is calculated by this model, the formulas of vertical crack opening, crack spacing and fracture permeability are given. Through logging interpretation of coalbed methane wells in Tunliu area and Shouyang area of Shanxi Province and comparison with the analysis results, it is proved that the application effect is good.