Overburden pressure is the source power of sedimentary compaction,and is also the key data to compute core pressure.This paper shows density variation with overburden pressure and core pressure,the effect of different thicknesses of mudstone on overburden pressure and core pressure.It is proved that the maximum core pressure variation is 0.02 while density variation of mudstone is 0.3 g/cm3 from 100 to 400 m,and overburden pressure is almost the same by density integration which is filtered form 3 to 250 Hz,which represents low-frequency tendency.Therefore,on the basis of the relationship between the effective stress of the normal compacted formation and the pressure of the overlying strata,a fast method was established for converting the pressure field according to the well-controlled seismic layer velocity field,which was verified by multiple drill holes in some structure of West Bohai Sea,thus satisfying rapid exploration.
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