煤层气储层测井评价

EVALUATING COALBED METHANE RESERVOIR BY LOG DATA

煤层储集具有双重孔隙介质特征,由煤的基质微孔和割理(裂缝)系统组成,因而传统的评价常规天然气储层的方法不能适合于评价煤层气储层,如何研究煤层气测井评价技术有十分重要的意义。文章在大量文献调研的基础上,基于国内外煤层气测井技术的发展现状,综合评述了测井评价煤层气储层领域的新进展,包括测井系列选择、煤层划分和岩性,煤质参数计算、孔隙度、渗透率、饱和度、含气量等煤层气储层参数计算,煤层力学参数和地应力分析、煤层对比、沉积环境分析等等,重点论述了煤质参数、煤层孔隙度、含气量的计算方法理论,并分析了煤层气储层测井评价当前面临的技术问题、难题及今后努力的方向。

Coal reservoir is of dual porosity media, being composed of matrix micropores and cleats (fissures), so that the traditional methods of evaluating conventional natural gas are unsuitable for coalbed methane reservoir evaluation. It is very important to study the technique of evaluating coalbed methane reservoir by log data. On the basis of investigating a large number of literatures, in consideration of the current situation of expanding coalbed methane logging techniques at home and abroad, the outhor comments comprehensively the new developments in evaluating coalbed methans reservoir by log data, which includes the logging program selection, the coal bed division and lithology, the calculations of coal quality parameters, the calculations of coalbed methane reservoir parameters as porosity, permeability, saturation and gas content, etc., the analyses of coalbed mechanics and ground stress, the coal bed correlation, the sedimentary environmental analysis and so on; emphatically expouds the calculation methods of coal quality parameters, coalbed porosity and gas content; and analyzes the problems and difficulties faced by evaluating coalbed methane reservoir by log data at present, and the ways of their being resolved.