成都理工大学学报（自然科学版）2017，Vol.44Issue(2)：129-138,10.DOI:10.3969/j.issn.1671-9727.2017.02.01
四川盆地超深层泥页岩纳米孔隙特征及其地质意义
Nanopore characteristics of super-deep buried mudstones in Sichuan Basin and its geological implication
摘要
Abstract
SEM-PCAS method and N2 gas adsorption are used to study the nanopore characteristics of super-deep buried mudstones from the drilling well X at the depth of 6 875 ～8 042 m,so as to understand the influence of buried depth on shale pore system.A group of mudstones buried at the depth of 0～5 km in Sichuan Basin and its periphery area are selected as parallel samples.It shows that the nanopore characteristics of super-deep buried mudstones of 32 samples from Longmaxi Formation of Silurian,Wufeng Formation of Ordovician and Qiongzhusi Formation of Cambrian are fundamentally similar.Pore types of super-deep buried mudstones are mainly organic matter pores and intergranular pores,while intragranular pores constitute only a small part,with the narrowly shaped fissures as the major pore shape.N2 adsorption experiment shows that the isotherms types of all 32 samples are Ⅳ-H3 and the QSDFT pore size distribution focus on the range of 4～16 nm with the BET surface areas of being 8.63～16.13 m2/g.Compared to parallel samples,super-deep buried mudstones in Well X have more dispersed pore size distribution,smaller micropore volume and micropore surface area,possess advantage on the ratios of mesopore/micropore volume and mesopore/micropore surface area.It reveals that the nanopore characteristics of super-deep buried mudstones in Sichuan Basin are controlled by depth and the compaction related to depth also play a role in variation of pore sizes and pore shapes.关键词
超深层泥页岩/筇竹寺组/纳米孔隙/N2等温吸附/SEM-PCASKey words
super-deep buried mudstones/Qiongzhusi Formation/nanopores/N2 adsorption/SEM-PCAS分类
天文与地球科学引用本文复制引用
焦堃,夏国栋,王瀚,叶玥豪,刘树根,冉波,邓宾,李智武,李金玺,雍自权,姜磊..四川盆地超深层泥页岩纳米孔隙特征及其地质意义[J].成都理工大学学报（自然科学版）,2017,44(2):129-138,10.基金项目
四川省科技计划项目(15ZC1390) （15ZC1390）
国家自然科学基金项目(41572119). （41572119）
