Construction of Three-Dimensional Geomechanical Model Based on Seismic Data

Accurate pre-drilling prediction of formation pressure is not only necessary to ensure drilling safety, but also of great significance to the deployment of horizontal well positions. Through the use of the P-wave impedance data volume that can be directly predicted by the post stack seismic data, combined with the conversion formula between various rock mechanical parameters, based on the analysis of adjacent well data, other rock mechanical parameters can be obtained by using the obtained uniaxial compressive strength through the parameter equation. At present, the methods to obtain formation fracture pressure mainly include indoor rock sample fracture test and logging data estimation, but these two methods can only obtain formation fracture pressure data at a single sample point or wellbore. In this paper, the influence of factors such as overburden stress, wellbore stress concentration, underground non-uniform tectonic stress and rock strength are comprehensively considered, and the information of spatial distribution of formation fracture pressure is obtained, and the prediction model of formation fracture pressure is built. Based on seismic, logging and adjacent well data, the missing information is compensated by using the SVM data fusion method, and the 3D model is reconstructed by using the prestack seismic data inversion results. According to the trajectory of offshore well D, the predicted rock mechanical parameters are extracted and compared with the corresponding measured data, and the coincidence degree is more than 85%.