By analyzing the limitations of the traditional pore pressure prediction methods

a new pore pressure prediction approach based on the effective stress theorem and the acoustic velocity model is proposed.It first calculates clay content

porosity

and acoustic velocity with relevant log data

and then calculates vertical effective stress by using Support Vector Machines for Regression and the overburden pressure with density log data

and finally calculate formation pore pressure by the effective pressure theorem.Practical application of the approach shows that it is feasible in prediction of abnormal formation pressure of sandstone and shale caused by undercompaction.Compared with traditional pore pressure prediction methods

the approach does not require establishing normal compaction trend line and has better adaptability and higher accuracy of predictions.