High Precision Pre-drilling Pressure Prediction for Complex Cause’s Overpressure

High precision pre-drilling pressure prediction is one of the key technologies in the integration of seismic-geology-engineering. The accurate identification of the mechanism of overpressure can effectively guide the construction of pressure prediction models, and quantitative identification of overpressure’s mechanism can be achieved through methods such as logging curve combination and Bowers method; In response to the problem of weak rock physics foundation in the conventional Eaton method, an improved Eaton method based on rock physics theory is proposed, which can effectively improve the accuracy of pressure prediction model; High precision three-dimensional velocity is the key to pre-drilling pressure prediction, through comparative analysis of tomographic modeling velocity and pre-stack inversion velocity, it is confirmed that the accuracy of pre-stack inversion velocity meets the requirements of deep pressure prediction. In response to the challenge of high-precision pressure prediction for complex causes of overpressure, an integrated formation pressure prediction technology is proposed based on quantitative identification of overpressure causes, with the construction of pressure prediction models as the core, and pre-drilling pressure prediction as the key. Good application results have been achieved in a certain research area in the East China Sea, with a relative error of 7.84% in pre-drilling pressure prediction, and accurately characterizes the overpressure characteristics of deep reservoirs, indicating that the integrated formation pressure prediction technology proposed in this paper is suitable for high-precision pre drilling prediction of complex cause’s overpressure.