�й�ú����������������������̽��

中国煤层气储层具有独特性,由于成煤期后构造破坏强烈,构造煤发育,所以具有煤层气储层低含气饱和度、低渗透率以及低压力的“三低”特性;煤层气储层的原地应力比较大;目前的煤层气开发以中、高阶煤为主;中、高阶煤具有非常强烈的非均质性。针对中国煤层气储层的基本特性,文章提出了煤层气的开发技术,主要包括“动中之静”概念在煤层气选区评价中的应用;研究了煤层气储层封盖条件,主要包括煤层气储层的区域盖层研究和地下水动力学研究;煤层气储层保护研究,主要是指在煤层气钻井和完井工程作业过程中对煤层气储层所造成的伤害进行预防并使伤害程度最小化;煤层气储层增产措施研究,指建立有效的原地应力释放区、井间干扰效果明显、提高储层的导流能力以及有效压差;加快煤层气解吸速率和提高解吸量的研究。

Study on Reservoir Characteristics and Development Technology of Coal-bed Gas in China

Coal bed gas reservoirs in China has special characteristics called "3 lows",i e low gas saturation,low permeability and low pressure,and has high original in situ stress since strong tectonic/structural activities happened after coal forming At present,coal bed gas is exploited mainly aiming to the medium and high rank of coal that has strong heterogeneity According to these characteristics,the article proposes to apply the conception of "steady within acting" to select and appraise exploitation areas of coal bed gas Also,the article studies the sealing and capping conditions of coal bed reservoirs, mainly including the regional cap study and underground water kinetics study of coal bed gas reservoirs And reservoir protection of coal bed gas is discussed in the article to prevent and minimize the reservoir damage caused by drilling and completion activities The article suggests some measures to increase the production of coal bed gas reservoirs, such as making effective in situ stress releasing zones,conducting interference between wells which has got good results,increasing the conductivity and effective pressure difference of the reservoirs,speeding up the de absorptive rate of coal bed gas and improving the de absorption quantity of coal bed gas