Rock Physics Modeling Of Shale In Logging Scale And Study On Inversion Method Of Kerogen Content

With the continuous improvement of the exploration and development of oil and gas resources,shale oil and gas resources have become a hot spot for exploration and development.Kerogen content is an important parameter for shale reservoir logging evaluation.Reliable method for calculating shale reservoir kerogen content is of great significance for the exploration and development of shale oil and gas resources.At present,the method of calculating kerogen content of shale reservoir by well logging data is not applicable enough and the precision is not high enough.Therefore,a new method for determining kerogen content of shale is studied,and a reliable calculation method of kerogen content is obtained for shale oil and gas.The successful exploration and development is of great significance.The existing shale rock physics model is suitable for seismic exploration scales,and the logging data for shale rock physics modeling is less accurate.In this paper,the commonly used rock physics modeling methods are analyzed and compared.The applicability of each method is analyzed.The models are divided into two categories: isotropic model and anisotropic model.By analyzing and comparing the modeling results of actual data,the application scope of each model is studied.The modeling process of shale rock physical elastic parameters based on SCA model,Kuster-Toks?z model and Backus average model is summarized.The process is applicable to the logging scale,and the effectiveness of the process is verified by processing and analyzing the actual data.Influencing factors of shale acoustic time difference based on the proposed shale rock physics modeling process are analyzed.Based on the analysis results of the influence factors of acoustic wave time difference,an inversion algorithm of shale kerogen content based on shale rock physical elastic parameter modeling on logging scale is proposed.Based on the analysis of the actual data of two wells,the reliability of the kerogen content inversion algorithm based on petrophysical model is proved.