黔西地层热流体差异作用及其煤层气成藏效应  

Differential effect of hydrothermal fluid in formation and accumulation effect of coalbed methane in West Guizhou

作　　者：唐淑玲[1] 汤达祯[1] 许浩[1] 陶树[1] 李松[1] 

机构地区：[1]中国地质大学(北京)煤层气国家工程中心煤储层实验室,北京100083

出　　处：《煤炭科学技术》2016年第2期8-16,共9页Coal Science and Technology

基　　金：国家科技重大专项资助项目(2011ZX05034);国家自然科学基金重点资助项目(0730422);国家自然科学基金面上资助项目(41272175)

摘　　要：为了研究煤层气系统热流体偶合地质作用机制,对织金、盘县煤系热流体地质特征进行了对比,并从地层热流体活动新的视角分析了黔西煤层气富集成藏地质选择过程。研究表明:织金、盘县均存在两期区域性热流体活动,早期以钙质流体为载体,晚期以硅质流体和少量钙质流体为载体,分别属于地层流体热循环作用和深源高温热流体的差异注入。热流体作用促使煤层气集中高强度生成和运移,产生密集成群管状气孔,与构造应力协同,导致煤体开裂破碎,明显影响煤的孔渗性。煤系地层中相对封闭滞留的热流体环境,是导致煤层气系统高压形成的重要因素之一。黔西北部台隆处于相对封闭滞留区,高温热流体配置条件更有利于煤层气富集成藏。In order to discuss the coupling geological mechanism of hydrothermal fluid in coalbed methane system,this paper compared the geological character of the hydrothermal fluid between Zhijin and Panxian in West Guizhou,and analyzed the geological process of enrichment and accumulation of coalbed methane from new perspective of hydrothermal fluid activities in formation. The results showed that two stages regional thermal fluid activities happened in the Zhijin and Panxian. In the early stage,the calcium fluid was the carrier,but it became to siliceous fluid and a small amount of calcium fluid in the later stage. The former was the result of thermal cycling effect of fluid in formation,and the latter was caused by the differential injection of deep- source and high temperature fluid. The hydrothermal fluid impelled coalbed methane to generate and migrate at high intensity,along with producing dense swarms tubular pores,which were coincident with tectonic stress. As a result,the coal body was broken and the porosity and permeability of coal were affected obviously. One of the most important factors which lead to high stress in coalbed methane system was the relatively closed and stranded hydrothermal fluid environment in coal measure strata. Platform uprise in the northeast of Guizhou region was just in such an environment,where the high temperature fluid could provide more favorable conditions for the enrichment and accumulation of coalbed methane.

关 键 词：热流体 地质作用机理 煤层气 富集成藏作用 

分 类 号：P618.11[天文地球—矿床学]