煤炭资源勘查过程中煤层气资源评价技术研究

Study on evaluation technology of coalbed methane resources in coal resource exploration process

基于对我国煤炭勘查过程中煤层气资源评价现状和存在问题的分析,总结提出了煤炭勘查过程中,对煤层气资源勘查在工作程度、工程布置、控制程度、资源量/储量估算及报告编制等方面的评价程度和要求,并重点对煤炭与煤层气资源勘查相似的钻井、测井、含气量测试方法进行对比,提出了具体技术要求。结果表明:在煤炭勘查过程中钻探的煤层气井应执行煤层气相关的钻井作业规范,煤炭与煤层气的测井方法相似,但煤炭使用的小口径测井仪应用在煤层气测井时应进行井径校正;瓦斯含量和煤层气含量测试方法在采样方法、采样与装样时间、煤样完整性等方面存在差异,建议煤炭勘查过程中采取绳索取心,并按照煤层气含量测定方法进行煤层瓦斯测试,以提高精度。

Based on the evaluation status of coalbed methane resources and the analysis on the existed problems coal exploration process in China,the paper summarized and provided the evaluation degree and requirements on the work schedule,engineering layout,control schedule,resources volume/reserves estimated and report preparation as well as others of coalbed methane resource exploration in coal exploration process. A comparison was conducted on the drilling,logging and gas bearing volume test method similar applied to coal and coalbed methane exploration,and put forword the spectific technical requirements The result showed that in the coal exploration process,the drilling exploration of the coalbed methane well should be conducted on well drilling operation code related to coalbed methane. The logging method of coal and coalbed methane would be similar,but when a small diameter logger was applied to logging of coalbed methane well,the diameter of well should be corrected. The sampling method,sampling and loading time,coal sample integrity and other aspects for the gas content and coalbed methane content test methods would be different. In coal exploration process,a cable coring was proposed.The seam gas test should be conducted according to coalbed methane content test method in order to improve accuracy.