Characterizing anomalies detected on seismic-generated attributes is crucial in interpreting any formation of interest. Consequently, a representative rock physics model is needed to determine the effect of petrophysical properties on the seismic response. The developed workflow presented in this paper utilizes differential effective medium theory, Hudson's model for cracked media, and Gassmann's fluid substitution equation for anisotropic rock to represent horizontal transverse isotropic (HTI) in a reservoir rock. The rock physics model provides the ability to predict vertical incidence velocity variation for the compressional and two principal shear wave components (fast and slow) due to changes related to mineralogy, porosity, water saturation, fracture density, and pressure at the target unit. The forward modeling process involves varying a single parameter over its anticipated range, then determining the density and compressional and shear velocities. Although the presented petrophysical workflow is applied to Ordovician Red River Formation within Cedar Creek Anticline in the Williston Basin, it can be extended to other formations with the need to modify certain assumptions.
Presentation Date: Tuesday, September 26, 2017
Start Time: 10:35 AM
Location: Exhibit Hall C/D
Presentation Type: POSTER