利用地球物理资料预测异常地层压力

Geophysical attributes, e.g. interval velocity, resistivity, Poisson’s ration and some other seismic amplitude attributes, are function of the effective stress. The geophysical attributes are available to compute the effective stress and pore pressure based on the effective stress principle. This principle is applicable regardless the origin of abnormal pore pressure. The critical factors for the pore pressure prediction include how to build the model that fit the abnormal pressure’s origin and how to use proper geophysical attributes. Pore pressure prediction using geophysical data contains the following issues: (1) the origin of abnormal pressure analysis based on geological knowledge, well-logging and drilling data; (2) overburden pressure and effective stress computation using well logging data; (3) model selection by the relation between effective stress and geophysical attributes, e.g. velocity and others; (4) empirical coefficients calibration using optimization method; (5)high resolution velocity inversion and extraction of other attributes from seismic data; (6)3D pore pressure prediction according to the established model; (7) final results assessment.