Выпуск: 2 , Том: 33 , Год издания: 2015

In order to localize low pressures zones in sedimentary basins for oil and gas exploration, it is necessary to know P and S wave velocities for medium. Strictly speaking, we need to know the rock densities for all layers, and in addition there are many correlation tables between seismic velocities and densities; besides, density is a parameter admitted to change slowly with depth to the top of the target interface. P wave velocities are considered a conventional asset, and S wave velocities can be obtained from special field survey, in particular from converted P-S waves registered by VSP technology, and by petrophysical measurements. The theory in this paper deals with stress prediction in the subsurface, and takes in consideration the constitutive parameters (density and Lame's), and the geometry of the reservoir target surface. The model does not separate the different contributions (porosity, fluids) to the rock velocities controlled by the constitutive parameters. It is not a necessary condition that an anticline be a potential structure for oil and gas accumulation