Application of S-wave velocity forward in Turbidity reservoir prediction of Dongpu sag

Turbidity sand bodies of the 3~(rd) member from Shahejie formation of ShaPuwei sub-sag,Dongpu sag were characterized by fast lateral variation,deep buried depth,thin thickness,strong diagenesis and strong concealing property.By using traditional wave impedance inversion,effective reservoirs and the fluid properties were difficult to be identified.Combined with logging data in Pu-138 block,based on rock physics theory,by using conventional logging data,multiple mineral components were obtained.According to Xu-White model and Biot-Gassmann equation,the shear velocity forward was obtained and the quantitative interpretation template was established.The prediction and inversion of turbidite sand reservoirs in Puwei area were carried out by using elastic parameters,the inversion results were consistent with the actual drilling results and the consistent rate reached 76%,which proved the effectiveness of this prediction method.