The commom approach to pore pressure prediction is made in two main steps: (1)-determine the depth intervals wich contain mainly shale, (2)-evaluate the deviation in the petrophysical properties of the shale from the trend of normal compaction (e.g. Tertzaghi & Peck, 1948). Several alternative methods of velocity estimation from surface seismic data are usually employed at the second step (E.Penibaker, 1968). Some of the methods such as RMS velocity analysis, have low resolution. Other methods such as Pseudo Acoustic lmpedance transformation, do not provide the low frequency components which implies that the overall compaction trend for the shale sequences cannot be determined with sufficient accuracy. Furthermore, velocity based methods do not involve lithological subdivisions (i.e. step 1)


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