南方古生界页岩吸附特征及主控因素  

Adsorption Characteristics and Main Controlling Factors on the Paleozoic Shale in South China Region

作　　者：刘祖发[1] 李强强[1,2] 关帅[1] 卓文珊[1] 丁波[1] 

机构地区：[1]中山大学地理科学与规划学院,广东广州510275 [2]中山大学地球科学与地质工程学院,广东广州510275

出　　处：《天然气地球科学》2015年第9期1689-1695,共7页Natural Gas Geoscience

基　　金：国家重点基础研究计划("973")课题(编号:2012CB214705-02);国家科技重大专项(编号:2011ZX05008-002-41)联合资助

摘　　要：南方古生界巨大的页岩气潜力近年来受到广泛关注。重点研究了南方古生界页岩的吸附特征及其控制因素。对采集的19件页岩样品,主要进行了矿物组成分析及等温吸附实验,并对典型样品开展了热模拟实验,研究了不同温度点的等温吸附容量,探讨了很高成熟度阶段页岩的吸附性能。结果表明,上二叠统页岩最大吸附量范围在0.21～5.63cm3/g之间,下志留统—下寒武统页岩最大吸附量范围在1.66～3.32cm3/g之间。页岩TOC含量是控制页岩吸附容量的主要因素。TOC含量越高,页岩的吸附容量越大。黏土矿物的吸附能力弱,其对页岩吸附容量的贡献一般被有机质所掩盖。成熟度是影响页岩吸附能力的另一关键因素。对于EqRO或RO〈3.6%的样品,其吸附容量随着成熟度的增加而增加,但当EqRO或RO〉3.6%,进一步增加成熟度,页岩的吸附容量有降低的趋势。The huge shale gas potential in the Paleozoic strata in South China region has attracted a widespread attention in recent years.This paper focused on the study of adsorption characteristics and controlling factors on the Paleozoic shale.A total 19 shale samples were obtained,their mineral compositions were analyzed,and their isothermal adsorption experiments were carried out.A thermal simulation experiment was conducted for a selected sample to obtain a suite of sub-samples with different maturities,their isothermal adsorption capacities were measured and the adsorption characteristics of shale with very high maturities were discussed.The result shows that the maximum adsorption capacity is between 0.21cm3/g and5.63cm3/gfor the Upper Permian shales and 1.66-3.32cm3/g for the Lower Cambrian-Lower Silurian shales.TOCcontent of shale is the main factor to control the adsorption capacity.The higher the content of TOC,the greater the adsorption capacity of the shale.The adsorption ability of clay minerals is weak for the studied shale and their contribution to the adsorption capacity is generally covered by the associated organic matter.Maturity is another key factor to influence the adsorption capacity of the shale.For samples with an EqROor RO〈3.6%,the adsorption capacity increased with increasing maturity,but when EqROor RO〉3.6%,the adsorption capacity of the shale decreased with further increasing maturity.The present result is greatly significant to the evaluation of shale gas in the Paleozoic strata in South China region.

关 键 词：古生界页岩 吸附容量 TOC含量 成熟度 矿物组成 

分 类 号：TE122.2[石油与天然气工程—油气勘探]