浙江煤山上二叠统龙潭组页岩气储层矿物成分特征

摘要

In order to study the mineral characteristics of shale gas reservoirs,and analyze the influences of different minerals in shale gas reservoirs,in this paper,by using X-ray diffraction (XRD) technology,qualitative and quantitative analyses were performed on 17 shale samples from the Upper Permian Longtan Formation of Meishan Area,and it was put forward that,the difference of mineral composition results in the difference of shale reservoir performance.The results of research show that major components of the Longtan Formation mud shale Are composed of clay minerals and quartz,with an average of 49.1％ and 30.6％ respectively,the next is calcite with an average of 3.5％.In addition,a small amount of feldspar,pyrite,siderite and so on Are included.Clay minerals Are helpful for the adsorption of shale gas,brittle minerals such as quartz and calcite Are in favor of width generation by fracturing in the process of exploiting.The component and content of the mineral have influence on the adsorption capacity and retrofit of shale gas reservoirs.%为了研究页岩气储层的矿物特征,分析浙江煤山地区不同矿物对页岩气储层的影响,采用X射线衍射(XRD)技术,对煤山地区上二叠统龙潭组17个泥页岩矿物样本进行了定性和定量分析,并探讨了矿物不同组成可能造成的储层性能差异.结果表明,龙潭组泥页岩矿物成分以黏土矿物和石英为主,平均含量分别为49.1％和30.6％,其次是方解石,平均含量为3.5％,此外还含有少量长石、黄铁矿、菱铁矿等矿物.黏土矿物有利于页岩气吸附,石英和方解石等脆性矿物有利于开发过程中压裂造缝,其对页岩气藏的形成和开发都具有一定的积极作用.页岩气储层矿物成分的研究为其吸附储存、裂缝评价、压裂造缝等研究提供了坚实的基础.