Rock Properties In Low-porosity/low-permeability Sandstones

摘要

Velocities in sedimentary rocks are partially controlled by composition, porosity, and fluid type (all key terms in most empirical relationships and in Gassmann's equation). However, in low-porosity rocks, tight gas sands in particular, the importance of pore microstructure may be more important than other factors and may possibly dominate the velocity response. Clearly this may have an impact on our ability to use sonic velocities or seismic amplitudes as a measure of porosity in tight gas sand reservoirs.