Experimental Study on Petrophysical Properties as a Tool to Identify Pore Fluids in Tight-Rock Reservoirs

The petrophysical properties can be proper indicators to identify oil and gas reservoirs, since the pore fluids have significant effects on wave response. We performed ultrasonic measurements two sets of tight siltstones dolomites at partial saturation. P- S-wave velocities are obtained by pulse transmission technique, while attenuation is calculated using centroid-frequency shift spectral-ratio methods. fluid sensitivities different (i.e., velocities, impedances attenuation, Poisson's ratio, density, their combinations) quantitatively analyzed considering data distribution, based crossplot technique. result shows that (P- velocity ratios, first second Lamé constant ratio) with high fluid-sensitivity successfully distinguish from water, unlike water. Moreover, identified basis distribution areas. Ultrasonic rock-physics templates ratio vs. product density a poroelastic model, structural heterogeneity patchy saturation, used predict saturation porosity, which in good agreement experimental porosity ranges.