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

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.