我国煤层气储层研究现状及发展趋势

A REVIEW ON STUDIES OF COALBED METHANE RESERVOIRS IN CHINA

通过对煤层气储层描述及储层评价、煤储层分布、预测及选区评价、煤储层研究方法及实验技术等方面的系统评述后认为 ,我国目前已基本掌握了煤储层地质特征研究和地质评价选区技术、煤层气储层工程技术和储层模拟软件系统 ,并在煤层气储层研究方面有所突破。但我国煤储层的构造复杂 ,煤层多强烈变形、煤层结构常呈碎粒状及糜棱状等 ,煤储层多为贫煤和无烟煤 ,呈“三低一高”(煤层压力较低、煤层渗透率低、在水压裂等强化措施下形成的常规破裂裂缝所占比例低 ;煤层普遍具有较高的吸附力 )的物性特征 ,且变质程度偏高 ,高煤级煤 (贫煤—无烟煤 )占 49% ,独具“中国特色”。进而讨论了当前我国煤层气储层研究急待解决的 8个方面的科技问题和难点 ,指出了在 2 1世纪初叶我国煤层气储层研究的

A systematical review is made on coalbed methane reservoir description and valuation, coal reservoir distribution and prediction as well as its estimation of target area, methods to study coal reservoirs and the experiment technique in this paper. Also the research on coal reservoir geological characteristics and techniques of geological estimation on target area of coal reservoirs techniques on coalbed methane reservoir engineering, software systems of coal reservoirs simulation in China have been basically seized and shaped. Studies on coalbed methane reservoirs have been made some breakthrough. However, tectonics of coal reservoir in China are very complicated:coalbed transfiguration is stronger, and has granulated as well as mylonitic structures; coal reservoirs are usually lean coal and anthracite, and have three lower and one higher physical properties - lower coal reservoir pressure, lower coal reservoir permeability, lower percentage of routine fissure under the strengthen measure of hydraulic fracturing, and higher adsorbability of coal reserirs. While the rank of coal reservoir metamorphism tends high, higher-coal-rank coal - lean coal - anthracite accounts for 49%, thus indicating a unique Chinese feature. Furthermore, 8 scientific and technical points on research of coalbed methane reservoir have been summarized, which would need to be resolved urgently at present. Finally, 7 developing trends on research of coalbed gas reservoirs in China at infancy of 21th century have been pointed out.