Pore Pressure and Stress State
Pore-pressure prediction from well-log and seismic data is critical in drilling operations and also is important in estimations of geomechanical parameters and stress-states from seismic data. It is well established that stresses in the subsurface have a direct impact on rock physics and, hence, on seismic amplitudes. Indeed, knowledge of effective-stress variations laterally and with depth markedly reduces interpretation uncertainty and helps separate intrinsiceffects from extrinsic influences of pore pressure and stress state on seismic rock properties. An approach to pore-pressure and vertical-effective-stress analyses is discussed in Chapter 2.
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Seismic Petrophysics in Quantitative Interpretation
Seismic Petrophysics in Quantitative Interpretation is written for oil and gas industry professionals and academicians who are concerned with the use of seismic data in petroleum exploration and production. In addition, it should prove useful toward thoughtful applications of those data by geotechnical engineers. Seismic interpretation can be made simple and robust by integrating rock-physics principles with the seismic and petrophysical attributes that bear on the properties of conventional reservoirs (thickness, net/gross, lithology, porosity, permeability, and satu-ration) and of unconventional reservoirs (thickness, lithology, organic richness, and thermal maturity). Practical solutions can be used to address existing interpretation problems in rock-physics-based AVO analysis and prestack seismic inversion in order to streamline the workflows in subsurface characterization.