叠前同时反演技术在页岩油储层预测中的应用OA

The shale oil reservoir of the Lucaogou Formation in Block Ji36 of the western slope zone of the Jimusaer Sag,Junggar Basin,exhibits strong heterogeneity.The wave impedance difference between reservoir sweet spots and surrounding rocks is small,making conventional post-stack seismic inversion technology unable to accurately predict the distribution of sweet spots.Based on the consistent processing of logging curves,starting from the petrophysical model,this study analyzes the logging curve response characteristics of shale oil reservoirs and the sensitive petrophysical parameters of target reservoirs.The results show that shale oil reservoirs are well-developed in areas with low P-wave to S-wave velocity ratio and high P-wave impedance,and the analysis of P-wave impedance and P-wave to S-wave velocity ratio can distinguish sandstones from mudstones.The prediction results are highly consistent with drilling and well testing data,which proves that the 3D seismic pre-stack simultaneous inversion technology can accurately predict the sweet spots of shale oil reservoirs.The technology application provides a reference basis for the deployment of shale oil exploration wells and the optimal design of horizontal well trajectories in this block.