沁水盆地郑庄煤层气储层裂隙的测井响应特征

煤层气储层的裂隙发育程度与储层的地球物理测井响应特征相关,通过对沁水盆地郑庄区块80余口井测井资料的分析,总结了地质构造作用及裂隙发育对测井特征的影响,认为研究区识别煤层气储层裂隙的敏感参数依次为体积密度（DEN）、深侧向电阻率（RD）、声波时差（AC）、井径（CAL）、自然伽马（GR）、中子孔隙度（CNL）等,通过判断深、中、浅三个电阻率值的差异识别裂隙发育程度,建立了夹矸层RD≥3000 Ω·m、3000Ω·m＞RD≥1000Ω·m、1000Ω·m＞RD≥500Ω·m、RD＜500Ω·m、及CNL＞ 45％等几种类型的测井响应参数,给出了相应的测井响应示例,为建立研究区的裂隙发育展布提供了参考.

The Logging Response Characteristics of Reservoir Fracture of Coalbed Methane in Zhengzhuang Block of Qinshui Basin

The degree of fracture developement of coalbed methane reservoirs is related to geophysical logging response characteristics. By the analysis of the logging data of more than eighty wells in Zhengzhuang Block of Qinshui Basin, the role of geological structure and influences of fracture development on the well logging characteristic have been summa- rized, and then the sensitive parameters of well logging to identify the fracture development of coalbed methane were determined successively as DEN, RD, AC, CAL, GR and CNL in the research area. By determining the difference resistivity values of deep, shallow later-olog, the degree of development of fracture is identified. The several typical well logging parameters have been used to recognize fracture development characteristics for partings seam, RD≥3000 Ω·m,3000Ω·m〉RD≥1000Ω·m,1000Ω·m〉RD≥500Ω·m,RD〈500Ω·m and CNL〉 45%. The corresponding well logging response examples are provid- ed. This study provides a reference to the establishment of fractured distribution in the study area.