中国南方古生界页岩吸附特征及控制因素  

Characterizing the methane sorption and its controlling factors in Paleozoic shales of south China

作　　者：王思波[1,2] 宋之光[2] 曹涛涛[2] 夏嘉[2] 

机构地区：[1]中国科学院南海海洋研究所中国科学院边缘海地质重点实验室,广东广州510301 [2]中国科学院广州地球化学研究所有机地球化学国家重点实验室,广东广州510640

出　　处：《地球化学》2014年第5期429-436,共8页Geochimica

基　　金：国家自然科学基金(41273058);国家科技重大专项(2011ZX05008-002-20)

摘　　要：通过对中国南方古生界上扬子和下扬子地区的页岩甲烷吸附量、有机质丰度、矿物组成和 Tmax 等的分析，研究了总有机碳（TOC）含量、黏土矿物组成和有机质成熟度与页岩甲烷吸附量的相关性。结果显示：（1）中国南方古生界页岩样品甲烷吸附量在1.29~4.26 mL/g之间，变化较大，但多数样品吸附量在2.5~3.0 mL/g之间；（2）泥页岩的 TOC 与甲烷吸附量具有正相关关系，显示有机质及其含量是控制页岩吸附的主要因素；但在高过成熟阶段，随成熟度的升高，页岩的甲烷吸附量有下降的趋势；（3）黏土矿物含量与页岩吸附量没有相关关系，尽管个别黏土矿物如蒙脱石显示了一定的吸附能力。The methane sorption capacities of Paleozoic shales in the Upper and Lower Yangtze platform region in south China and their correlation with the TOC content, mineral composition and Tmax were investigated. The primary results suggest：（1） the methane sorption capacities of the Paleozoic shales in south China are in a broad range of 1.29-4.26 mL/g with most methane sorption capacities of the samples are mainly in the range of 2.5-3.0 mL/g, however, the methane sorption isotherms are somewhat different; （2） there is a general positive correlation between the TOC content and methane sorption capacity and indicates that organic matter and its content is the controlling factor of shale sorption; it is also worthwhile to point out that a declination in the methane sorption capacity of shales is observed as the Tmax increased for the high and over matured shales;（3） there is no correlation between clay mineral content and methane sorption capacity, although there is a weak positive correlation between montmorillonite content and methane sorption capacity.

关 键 词：甲烷吸附量 总有机碳 有机质成熟度 黏土矿物 南方古生界页岩 

分 类 号：P597[天文地球—地球化学] P618.13[天文地球—地质学]