Seismic Petrophysics of Unconventional Reservoirs
Over the last several years, both the exploration and the development of unconventional shales have grown dramatically and, in fact, many operators have switched to unconventional plays. It is often thought that these plays also require unconventional approaches to reservoir characterization. In Chapter 6, “Seismic Petrophysics of Unconventional Reservoirs,” it is demonstrated that the fundamental workflows typical for conventional reservoirs still are applicable in organic shales. However, the complexity of rock-physics modeling increases in proportion to the additional parameters of interest, such as total organic carbon (TOC) content and thermal maturity, and their effects on organic porosity, overpressure, and the stress sensitivity of seismic velocities.
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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.