对我国煤层气勘探前景的再认识

我国的煤层气勘探已经取得了令人鼓舞的成果,众多地区的勘探开发试验取得了工业性突破,并发现了大型煤层气田。与此同时,也存在着勘探开发的技术难题和不同认识,主要集中体现在煤层气地质条件的影响方面。作者从影响煤层气勘探的地质条件出发,探讨了煤层气资源的可采性,认为目前能够采用排水来气方法开发煤层气资源的地区是有限的,这主要受制于煤层气的可采性,而煤层气的可采性则主要取决于煤体结构、地层压力和水文地质条件。文中首比提出了划分煤层气的3种水文地质类型及分布区域,分析了不同水文地质类型对煤层气可采性造成的不同影响,探讨了煤层气综合勘探开发的前景,并提出了今后煤层气勘探工作的建议。 

A REDISCUSSION ON THE EXPLORATION PROSPECT OF COAL BED GAS IN CHINA

Encouraging achievements have been obtained from the exploration of coal bed gas in china. In many areas, an industrial breakthrough has been made in exploation and development tests, and large scale coal bed gas fields hav been discovered. But there exists technical problems and different opinions to the exploration and development which mainly reflect the influence from the gelogic conditions of coal bed gas. From the geologic conditions which affect the exploration of coal bed gas, the author studied the mineability of coal bed gas resources and considered that the area whose coal bed gas resources can be developed by the drainage gas-collecting method is limited at the present. This is mainly controlled by the mineability of coal bed gas. The mineability of coal bed gas mainly depends on coal texture, formation pressure and hydrogeologic conditions. In this paper,three hydrogeologic types of coal bed gas and their distributive regions were suggested for the first time, different influence caused by different hydrogeologic types to the mineability of coal bed gas was analysed, and the prospect to the comprehensive exploration and development of coal bed gas was discussed. Also, the author gave some advises to the later exploration work of coal bed gas.