IMPROVING THE PREDICTION ACCURACY OF FORMATION PORE PRESSURE, BASED ON THREE-DIMENSIONAL GEOMECHANICAL MODELING FOR GEOLOGICAL ENVIRONMENT PROTECTION

With the continuous development of oil and gas resources, the demand for geological environment protection is becoming more and more important. Formation pore pressure is an important basis for determining well structure, drilling fluid density and drilling parameters. Accurate prediction of formation pore pressure helps to achieve safe and efficient drilling. However, traditional formation pore pressure prediction methods usually have certain limitations and Inadequate, this paper proposes a method based on three-dimensional geomechanical modeling to improve the prediction accuracy of formation pore pressure. Firstly, the logging data, seismic data and VSP data of the regional work area are collected to calculate the key parameters of the three-dimensional geomechanical model; Secondly, a geomechanical model based on regional geological and logging data is established, and the effectiveness of the model is verified, then adjust the model through the pretreatment of key wells; Finally, based on the three-dimensional geomechanical model, the data are extracted along the borehole trajectory to predict the pore pressure. The results show that the average prediction accuracy of pore pressure in Yuanba area of the demonstration area is 90.39%, and the average prediction accuracy of the modified model is 92.32%. Compared with the engineering drilling data, the prediction results are within the range, which verifies the effectiveness of the model. This study provides a reliable reference for effectively improving the efficiency of oil & gas drilling and reducing geological environment pollution.