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太行山东麓页岩储层地球化学参数测井计算方法研究

Study on well logging calculation method of geochemical parameters of shale reservoir in eastern foot of Taihang Mountain

  • 摘要: 为了较好地进行太行山东麓的页岩气储层测井评价,地球化学参数是研究页岩储层的重要参数,对储层有效性评价具有重要意义。基于太行山东麓页岩常规测井资料和地球化学参数测试,以石炭系上统太原组泥页岩为研究对象,对页岩储层测井响应特征统计分析。通过对页岩储层总有机碳含量、镜质体反射率和生烃潜力与测井参数值相关性分析,优选敏感参数并建立相应测井计算模型,利用所建模型对页岩储层3个地球化学参数进行了计算,进而查明页岩储层总有机碳含量、镜质体反射率及生烃潜力平面展布特征。结果表明:此页岩储层测井响应特征总体呈现“三高、一低、一中”特征;总有机碳含量与自然伽马、密度和声波时差相关性好;镜质体反射率与常规测井响应的相关性比较差,与深度呈良好的正相关关系;生烃潜力与镜质体反射率、声波时差及自然电位相关性较好。采用多元回归分析方法建立了太行山东麓A区块页岩储层总有机碳含量、镜质体反射率和生烃潜力计算模型,计算结果与实测结果吻合度较高,总有机碳含量相对误差小于8%,镜质体反射率相对误差小于3%,生烃潜力相对误差小于5%,表明该计算方法对该区地球化学参数计算效果明显。

     

    Abstract: In order to complete shale reservoir logging evaluation in the eastern foot of Taihang Mountain, geochemical parameters are very important in studying shale reservoir and play a significant part in assessing shale reservoir effectively.The statistical analysis was performed on the logging response characteristics of shale reservoirs of the mud shale in Taiyuan Formation of Upper Carboniferous using the conventional logging data and shale geochemical parameter tests.By analyzing the correlation that logging parameters have with total organic carbon, vitrinite reflectance and hydrocarbon generation potential in shale reservoir, followed by optimizing sensitive logging parameters, relevant calculation models are constructed to figure out the planar distribution characteristics of the total organic carbon, vitrinite reflectance and hydrocarbon potential.The results indicate that logging response from the shale reservoir can be generally summarized as “three high, one low and one medium”.The total organic carbon has good correlation with natural gamma, density and acoustic.However, the correlation between vitrinite reflectance and the response of conventional logging is poor, but vitrinite reflectance is in good positive correlation with the depth.And the hydrocarbon potential is well correlated with vitrinite reflectance, acoustic and spontaneous potential.In summary, a calculation model is constructed using multiple regression analysis for calculating the total organic carbon, vitrinite reflectance and hydrocarbon potential of shale reservoir in Area A of Taihang Mountain.Furthermore, the calculated results are in good agreement with the measured ones.The relative error of the total organic carbon, vitrinite reflectance and hydrocarbon potential are generally within 8%, 3%, 5% respectively,indicating that the method is effective for studying geochemical parameters.

     

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