Methane adsorption comparison of different thermal maturity kerogens in shale gas system  

作　　者：HU Haiyan 

机构地区：[1]School of Geosciences, Yangtze University

出　　处：《Chinese Journal Of Geochemistry》2014年第4期425-430,共6页中国地球化学学报

基　　金：funded jointly by the National Natural Science Foundation of China (41472122);973 project (2012CB214702);open foundation of Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education [China University of Geosciences (Wuhan)] (TPR-2010-19)

摘　　要：To determine the effect of thermal maturity on the methane sorption in shale gas system, two different thermal maturity kerogens of type Ⅱ isolated from Barnett shale of Fort Worth Basin were used to measure the methane adsorption amount under the pressure ranging from 0 to 14 MPa at constant temperatures. One kerogen was called Lee C-5-1 with 0.58% of vitrinite reflectance; the other was called Blakely#1 kerogen with 2.01% of vitrinite reflectance. The results suggested that the methane sorption capacity of kerogen Blakely#1 was higher than the immature kerogen Lee C-5-1, and its Langmuir constant and Langmuir maximum sorption amount, which were reached by fitting the measured data for at least square method, greater than the immature kerogen Lee C-5-1. This may be associated with that nanopores opened up during the degradation of organic matter, and which increased the specific surface area of kerogen. Therefore, the over mature kerogen has greater methane adsorption capacity.To determine the effect of thermal maturity on the methane sorption in shale gas system, two different thermal maturity kerogens of type II isolated from Barnett shale of Fort Worth Basin were used to measure the methane adsorption amount under the pressure ranging from 0 to 14 MPa at constant temperatures. One kerogen was called Lee C-5-1 with 0.58% of vitrinite reflectance; the other was called Blakely#1 kerogen with 2.01% of vitrinite reflectance. The results suggested that the methane sorption capacity of kerogen Blakely#1 was higher than the immature kerogen Lee C-5-1, and its Langmuir constant and Langmuir maximum sorption amount, which were reached by fitting the measured data for at least square method, greater than the immature kerogen Lee C-5-1. This may be associated with that nanopores opened up during the degradation of organic matter, and which increased the specific surface area of kerogen. Therefore, the over mature kerogen has greater methane adsorption capacity.

关 键 词：甲烷吸附 热成熟度 干酪根 气系统 页岩 吸附比 镜质组反射率 镜质体反射率 

分 类 号：P618.13[天文地球—矿床学]