煤层气储层测井评价方法研究

Research on Logging Evaluation Method for Coalbed Methane Reservoir

根据生产资料总结了QS盆地中部JS区块二叠系山西组和石炭系太原组的煤岩储层及其他岩性的测井响应特征,为该地区岩性识别奠定了基础。结合前人的研究工作,基于考虑煤岩的组分、测井系列、地层压力和温度对煤质参数的影响,给出了自然伽马(或无铀自然伽马)求取煤岩工业分析参数定量评价方法,同时利用改进后的兰氏方程计算煤层的含气量,从生产资料的实际处理效果发现,建立的煤质参数评价模型可信度较高,为评价煤层气资源提供了可靠参数。

Geophysical well logging technology is an important means in coalbed methane reservoir evaluation. Based on actual production data, summarized are the logging response characteristics of combed reservoir and other lithology of Shanxi and Taiyuan formation of Permian, JS block in the middle of QS basin, which is the basis for lithology identification in this area. From former researches and influence of coal maceral, logging series, formation pressure and tempera- ture on the quality parameters of coal, derived is the quantitative evaluation method by GR（or KTh） on proximate analyses of combed. Meanwhile, calculated is gas content by the improved Langmuir equation. The result of the actual data processing shows that the established evaluation model has higher reliability and provides reliable parameters for assessing combed methane resources.