基于统计学方法的页岩孔容预测

发布时间：2018-03-16 10:47

本文选题：页岩　切入点：页岩组分　出处：《煤田地质与勘探》2017年01期 　论文类型：期刊论文

【摘要】：页岩气储集空间与储层矿物特征关系密切,以四川盆地东缘龙马溪组页岩为研究对象,利用矿物组成、微量元素、地球化学等测试结果,结合低温氮气吸附法和高分辨率成像技术,采用多元统计分析方法,建立了页岩孔容预测方程,并分析孔隙分布特征和影响因素。结果表明,龙马溪组中部和底部页岩组分含量差异较大,生物成因的自生石英发育是龙马溪组底部石英含量高的主要原因;页岩纳米级孔隙以2~5 nm为主,对孔容贡献率介于64.2%~70.1%;建立的页岩组分含量与孔容的预测模型高度显著。脆性矿物孔、黏土矿物片间孔及其粒内孔是富黏土矿物页岩的主要孔隙类型,孔隙呈微缝状,小于2 nm孔隙不发育;有机质含量是富有机质页岩孔容大小的主控因素,有机质孔的面孔率介于8.8%~12.5%;有机质含量及成熟度是小于2 nm微孔发育的主控因素,大于50 nm孔隙的发育则受控于黏土矿物、石英及长石含量。
[Abstract]:Shale gas reservoir space is closely related to reservoir mineral characteristics. Taking Longmaxi formation shale in the eastern margin of Sichuan Basin as an object of study, the results of mineral composition, trace elements and geochemistry are used. Combined with low temperature nitrogen adsorption method and high resolution imaging technique, the prediction equation of shale pore volume was established by using multivariate statistical analysis method, and the pore distribution characteristics and influencing factors were analyzed. The content of shale components in the middle and bottom of Longmaxi formation is quite different, the development of biogenic authigenic quartz is the main reason for the high content of quartz in the bottom of Longmaxi formation. The contribution rate to pore volume is between 64.2% and 70.1%. The prediction model of shale component content and pore volume is highly significant. Brittle mineral pore, clay mineral interlaminar pore and intergranular pore are the main pore types of clay rich mineral shale. The porosity is less than 2 nm, the content of organic matter is the main factor controlling the pore volume of rich organic matter shale, the porosity of organic matter is between 8.8% and 12.5%, the content and maturity of organic matter is the main factor controlling the development of micropore less than 2 nm. The development of pores greater than 50 nm is controlled by the contents of clay minerals quartz and feldspar.
【作者单位】：西南石油大学油气藏地质及开发工程国家重点实验室;
【基金】：国家自然科学基金项目(51674209) 国家科技重大专项课题(2011ZX05018-005)~~
【分类号】：P618.13

【相似文献】