Patent ID: 7617051

Claim:
A method for pore pressure prediction, comprising: obtaining, using a processor, a compressional wave (P-wave) velocity and a shear wave (S-wave) velocity for a pre-drill location; calculating, using the processor, an effective stress at the pre-drilling location using a stress-velocity relationship equation, a stress sensitivity coefficient, the compressional wave (P-wave) velocity, and the shear wave (S-wave) velocity; obtaining, using the processor, a total stress at the pre-drill location; calculating, using the processor, a predicted pore pressure, at the pre-drill location, using the effective stress, the total stress, and a stress-pressure relationship equation; and adjusting, using the processor, a drilling operation associated with the pre-drill location, based on the predicted pore pressure, wherein the stress sensitivity coefficient is validated by obtaining an alternate pore pressure at the pre-drill location using a pore pressure at a location in an offset well and information about a hydrostatic gradient between the location in the offset well and the pre-drill location, wherein the location in the offset well is located in a high permeability substance and the high permeability substance extends to the pre-drill location.