鄂西渝东地区页岩岩石物理参数试验研究

Experimental Study on Rock Physical Parameters of Shale Samples in Western Hubei and Eastern Chongqing Area

摘要: 研究页岩气储层岩石的物理参数及其地球物理响应特征对其资源评价具有重要意义。基于鄂西渝东地区海相页岩露头标本，在实验室内测量页岩的密度、声波速度、渗透率和复电阻率。结果表明，研究区页岩具有低密度、低渗透率、相对中高电阻率的特征，但页岩极化率相差较大，最高达40.8%，最低14.5%，分为高极化率、中极化率和低极化率3个层次。研究区页岩的矿物成分主要为石英和黏土，但下志留统龙马溪组页岩的脆性矿物含量更高，下寒武统水井沱组页岩方解石和白云石含量相较于龙马溪组更高。

Abstract: It is of great significance for the evaluation of resources to study the physical parameters of shale gas reservoir rocks and its geophysical response characteristics. The shale density, velocity, per-meability and complex resistivity are measured in the laboratory based on outcrop samples of marine shale in Western Hubei and Eastern Chongqing area. The results show that the shale of study area has the characteristics of low density, low permeability and relatively medium and high resistivity, but the polarizability is different, the largest up to 40.8%, the lowest 14.5%, which are divided into 3 levels of high polarizability, medium polarizability and low polarizability. The min-eral composition is mainly quartz and clay, but shale brittle mineral content of Lower Silurian Longmaxi formation is higher. Calcite and dolomite content of Lower Cambrian Shuijingtuo forma-tion is higher compared to Longmaxi group.