Выпуск: 1 , Год издания: 2016

The present paper is part of a major research study that has for objective the prediction of stress in sedimentary basins, as a contribution to geological and engineering methods and techniques for oil and gas exploration. Such an attractive and important scientific theme is based on the knowledge of the compressional (vP) and shear (vS) wave velocities and the densities (ρ) distributions, in order to localize low pressures zones in sedimentary basins. It is rather usual to think and accept that pressure increases continuously with depth, and we show here that this is not the case. The vertical and horizontal pressure variations act as natural pumps that pushes fluids from high to low pressure zones. The major physical parameter for this phenomena is played by the (Formula Presented) ratio discontinuity along the interfaces. Most of the seismic exploration is based on the acoustical wave equation, that results in a knowledge for the compressional wave velocity model. To obtain the shear wave velocity information it is necessary a 3D component sensor survey, and density log information can also be incorporated. Shear wave velocities can also be obtained from VSP technology, and by petrophysical measurements.