陆相页岩储层特征及其影响因素:以四川盆地上三叠统须家河组页岩为例  

Reservoir characteristics and its influence on continental shale:An example from Triassic Xujiahe Formation shale,Sichuan Basin

作　　者：黄金亮 董大忠 李建忠 胡俊文 王玉满 李登华 王淑芳 

机构地区：[1]中国石油集团科学技术研究院,北京100083 [2]国家能源页岩气研发(实验)中心,河北廊坊065007

出　　处：《地学前缘》2016年第2期158-166,共9页Earth Science Frontiers

基　　金：国家油气重大专项"页岩气重点地区资源评价"(2011ZX05018-001);国家重点基础研究发展计划"973"项目(2013CB228001)

摘　　要：以我国四川盆地上三叠统须家河组页岩为重点研究对象,在大量岩心、露头样品分析化验基础上,开展陆相页岩储层孔隙特征研究。采用高压压汞法、液氮吸附法、脉冲式渗透率法等多种手段相结合测定页岩储集物性,表明须家河组具有一定的储集性能,孔隙度为0.95%~4.77%,平均为2.73%。运用岩心观察、薄片观察、场发射扫描电镜等直接观察手段与高压压汞、氮气等温吸附等实验系统研究须家河组页岩的储集空间特征,明确纳米级基质孔隙是须家河组储集空间的主体,包括原生残余孔、颗粒间孔、溶蚀孔和有机质孔,孔径2~100nm,〈50nm的孔隙占83.9%,有机质孔隙局部发育。影响须家河组页岩储层特征的主要控制因素包括TOC含量、黏土矿物含量以及有机质热演化程度。Based on drilling data,outcrop geologic survey around the area and laboratory test results of lots of rock samples,reservoir characteristics of Triassic Xujiahe Formation shale in the Sichuan basin are analyzed.Physical properties of the shale reservoir were tested by high pressure mercury intrusion method,nitrogen isothermal adsorption,and pulse permeability method.It is thought that Xujiahe Formation shale has a center of reservoir performance,and the porosity ranges from 0.95%to 4.77% with an average of 2.73%.A series of methods including direct observation method such as core and thin section observation,field emission scanning electron microscopy（FSEM）in combination with high-pressure mercury injection,nitrogen isothermal adsorption experiment research have been used to research the reservoir space characteristics of Xujiahe Formation.Nanoscale matrix pore is the dominant reservoir space in the Xujiahe Formation shale,and pore with size less than 50 nm accounted for 83.9%.Matrix pores with pore size of 2-100 nm include residual primary pores,intergranular pores,dissolved pores,and organic pores that only developed in local parts.It＇s pointed out that TOC content,clay mineral content and thermal maturity were the main controlling factors on reservoir characteristics of Xujiahe Formation shale.

关 键 词：陆相页岩 须家河组 孔隙特征 有机质孔 比表面积 孔径分布 

分 类 号：P618.130.21[天文地球—矿床学]