韩城矿区5^#煤层含气性影响因素研究

Study on Gas Content of No.5Coal-bed and Influencing Factors in Hancheng Mine

煤层的含气性是评价煤层气勘探开发前景的决定性因素之一。结合该区块地质资料、测井资料、录井资料、岩心分析资料等研究了韩城矿区5#煤层的含气性影响因素。首先建立自然伽马测井、电阻率测井和密度测井与含气性影响因素(灰分含量、镜质体反射率、煤层厚度)之间的关系模型,据此分析含气性影响因素与含气性的关系。研究表明,灰分含量与自然伽马和密度测井值均呈正相关;灰分含量越高,煤层含气性越差。镜质体反射率与自然伽马呈负相关,而与电阻率呈正相关;镜质体反射率越高,煤层含气性越好。煤层厚度与自然伽马呈负相关,与电阻率呈正相关;煤层厚度越大,含气性越好。

Combined with the areal geological data,logging data and core data the influencing factors,oil and gas bearing properties of No.5coal-bed are studied.By studying the natural gamma ray logging,resistivity logging,density logging and hydrocarbon content model,the influencing factors(ash content,vitrinite reflectance,thickness)of hydrocarbon reservoir are studied.In the region,the coal-bed hydrocarbon content factors and the logging response relationship are analyzed.The result shows that the ash content is related with vitrinite reflectance and it is negatively correlated with natural gamma ray,and resistivity is positively correlated.The higher the vitrinite reflectance is,the better the hydrocarbon content is.Ash content is a positive correlation with density and natural gamma logging value.The higher ash content is worse,and it is negative correlation with the natural gamma ray,and resistivity is positively correlated.