常规测井计算方法难以满足页岩气田探明储量申报对储层矿物含量解释精度的要求。基于全岩X衍射和数字岩心构建实验对下志留统龙马溪组页岩气储层矿物成分的认识,建立了简化的岩石物理体积模型,把岩石骨架近似看作由硅质矿物、碳酸盐矿物和黏土矿物组成。引入“黏土视骨架密度”参数,建立了新的储层矿物含量计算公式。采用岩心全岩X衍射、岩心物性、有机碳含量数据,建立适合研究区的黏土视骨架密度法系列计算图版。基于常规测井数据计算出有机碳含量,通过图版可求得黏土视骨架密度,进一步可求得页岩中与简化模型相对应的三类矿物含量。与传统方法对比,“黏土视骨架密度法”解释精度相对较高,且费用低廉,易于在研究区推广。 Conventional log calculation method is difficult to meet the shale gas field proved reserves declaration interpretation of the accuracy of mineral content requirements. Based on the understanding of the rock composition of shale gas reservoirs in the Lower Silurian Longmaxi Formation based on the experiments of whole rock X-ray diffraction and digital core construction, a simplified petrophysical volume model was established. The rock skeleton was approximately regarded as a siliceous mineral, Salt minerals and clay minerals. By introducing the parameter “clay visual skeleton density”, a new formula for calculating the mineral content in the reservoir was established. Based on X-ray diffraction, core physical property and organic carbon content data of core rock, a series of calculation charts of clay visual skeleton density method for the study area were established. The organic carbon content was calculated based on the conventional log data. The clay visual skeleton density can be obtained from the plate and the three types of minerals in the shale corresponding to the simplified model can be further obtained. Compared with the traditional method, the interpretation accuracy of clay visualization skeleton method is relatively high, and its cost is low, which is easy to popularize in the study area.