Vp-Vs ratio sensitivity to pressure, fluid, and lithology changes in tight gas sandstones

Tight gas sandstone reservoirs are a vast resource. Due to their complexity and our poor understanding of these unconventional petroleum systems, new technologies are necessary to successfully exploit them. Some of the geological challenges present in tight gas sandstone reservoirs are: high reservoir heterogeneity, very low porosity and permeability, possible presence of natural fractures, uncertainty in gas/water contact, and the influence of over-pressures. This study shows the integration of core, log, and seismic data in tight gas sandstones and the use of Vp/Vs as an attribute can help to distinguish reservoir changes.