构造煤煤层气及裂隙的测井响应和敏感参数分析:以沁水盆地郑庄地区为例

摘要

基于测井资料划分煤体结构对于煤层气勘探开发比较重要。通过对沁水盆地郑庄区块80口井测井资料的分析，总结了该地区3＃、15＃煤层各测井参数响应分布特征及其典型特征值范围，依据研究区情况将煤体结构划分为3类：原生结构煤、碎裂状构造煤、碎粒或糜棱状构造煤。针对这3种煤体结构类型及夹矸层确定了相关的测井响应典型特征值范围，认为对于煤层气储层及其裂隙判别的敏感参数依次为体积密度、深侧向电阻率、声波时差、井径、自然伽马、中子孔隙度等；通过判断深、中、浅3个电阻率值的差异识别裂隙发育程度，并建立了几种煤体结构类型的测井响应敏感参数及裂隙发育特征模式。%It is important to identify coal structure based on logging data for coalbed methane(CBM)exploration and development.By analysis the logging data of eighty wells in the Zhengzhuang block of Qinshui Basin,the typical characteristic values and frequency histograms had been summarized with the logging parameters of No. 3 and No. 1 5 coal seams.Based on the condition of the research area,the coal structures were divided into three types such as the original structure coal,the cataclastic structure coal,and the particle structure coal.And for those coal structures and partings,the typical characteristic values of logging response had been determined.It was shown that the sensitive parameters of logging to recognize the coalbed methane and fractured features were successively as DEN,RD,AC,CAL,GR and CNL in this area.And then by compare the difference of deep, shallow laterolog resistivity and flushed zone resistivity to identify the development degree of fractures,several modes for recognizing fracture development characteristics with sensitive parameters of well logging for CBM res-ervoir had been built.