川南煤田古叙矿区DC-5井上二叠统龙潭组煤层甲烷吸附性及其主控因素  

Constraints of methane absorbability in the Upper Permian Longtan Formation of Well DC-5 in Guxu mine area of southern Sichuan Coalfield

作　　者：鲍园 安超 琚宜文 尹中山[4] 熊建龙 王文愽 BAO Yuan;AN Chao;JU Yi-wen;YIN Zhong-shan;XIONG Jian-long;WANG Wen-bo(College of Geology and Environment,Xi’an University of Science and Technology,Xi’an 710054,China;Key Laboratory of Coal Resources Exploration and Comprehensive Utilization,Ministry of Natural Resources,Xi’an 710021,China;Key Laboratory of Computational Geodynamics of Chinese Academy of Sciences,College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;Geological Engineering Investigation and Design Institute,Sichuan Coalfield Geological Bureau,Chengdu 610072,China)

机构地区：[1]西安科技大学地质与环境学院,陕西西安710054 [2]自然资源部煤炭资源勘查与综合利用重点实验室,陕西西安710021 [3]中国科学院计算地球动力学重点实验室,中国科学院大学地球与行星科学学院,北京100049 [4]四川省煤田地质局工程勘察设计研究院,四川成都610072

出　　处：《天然气地球科学》2020年第1期93-99,共7页Natural Gas Geoscience

基　　金：国家自然科学基金项目“低阶煤生物气化过程中微纳米孔隙与大分子结构演化及其耦合机理”（编号：41972183）;四川省科技支撑计划项目“四川盆地东南缘古蔺县大村区块煤层气抽采试验”（编号：2016JZ0037）;西安科技大学博士启动金项目“煤系生物成因气生成演化机制”（编号：2018QDJ001）联合资助~~

摘　　要：煤层甲烷吸附性研究对于指导煤层气勘探开发以及揭示煤层储气机理具有重要作用。通过钻井取样、煤岩-煤质特性分析以及甲烷等温吸附实验,研究了川南煤田古叙矿区龙潭组不同深度煤层的煤质特征与甲烷吸附性差异,运用多元线性逐步回归方法分析了影响煤层甲烷吸附能力的主要因素。结果表明:古叙矿区龙潭组煤镜质组最大反射率RO,max值为2.83%~3.22%,属于高阶煤;显微组分以镜质组为主,惰质组次之,不含壳质组,无机矿物以黏土类为主;不同煤层的水分含量和挥发份产率差别不大,但是灰分产率和固定碳含量差别较大,导致朗格缪尔体积变化在11.39~25.06 m^3/t之间。认为固定碳含量是影响古叙矿区煤层甲烷吸附能力的主要因素,且固定碳含量与朗格缪尔体积呈正相关关系。Research on the absorbability of coalbed methane is of importance for guiding the exploration and exploitation of coalbed methane and revealing the storage mechanism of coalbed methane. This study investigates the coal quality and methane adsorption capacity at different depth of the Longtan Formation in the Guxu mine area of southern Sichuan Coalfield by drilling sampling,coal rock and coal analysis,and methane isothermal adsorption testing. The main geological factors affecting methane adsorption capacity are analyzed using a multiple linear stepwise regression method. Results show that the coal rank of the Longtan Formation in the Guxu mine area has reached the anthracite stage(Ro,max ranges from 2.83% to 3.22%),which belongs to high-rank coals.Vitrinite is the main component of coal maceral and followed by inertinite without exinite. Clay mineral is the main component of the inorganic mineral. The difference of moisture and volatile matter contents between coal seams in the Longtan Formation is small,while a large difference between ash and fixed carbon contents is observed. Langmuir volume(VL)of different coal seams ranges from 11.39 to 25.06 m^3/t. Fixed carbon content is the main factor affecting the methane adsorption capacity of the coal seams in the Guxu mine area. The content of fixed carbon is positively correlated with the methane adsorption quantity.

关 键 词：甲烷吸附 控制因素 龙潭组 古叙矿区 川南煤田 

分 类 号：TE122.2[石油与天然气工程—油气勘探]