Application of quasi-acoustic reconstruction technology in reservoir prediction of Damintun sag

The 4~(th) member of the Shahejie formation in Damintun sag is mainly of a fan-delta sedimentation,with characteristics of mixed accumulation near source, large longitudinal thickness, fast change of facies zone and lithology, long oil-gas well segment and large difference. Due to the low resolution of seismic data, the acoustic logging curve cannot directly reflect reservoir characteristics, and the conventional seismic inversion is difficult to identify the favorable reservoir of conglomerate. Aiming at the problems mentioned above, the seismic data are processed with high resolution in order to meet the requirements of subsequent seismic inversion, and then the preprocessing and sensitivity analysis of logging data are carried out. Finally, the pseudo-acoustic reconstruction technique based on wavelet transform are used to construct the pseudoacoustic curve, and the pseudo-acoustic curve is used for seismic inversion research. The actual application results show that the quasi-acoustic reconstruction technology can significantly improve the resolution and accuracy of reservoir prediction, accurately depict the favorable reservoir of sandy gravel mass in the lower section of the 4~(th) member of Shahejie formation.