Biot’s theory allows incorporation of permeability and viscosity in computing seismic amplitudes for a porous media that is fully saturated with a single phase fluid. In its original form, the theory did not explicitly account for capillary effects, specifically the surface tension that occurs between wetting and non-wetting fluid phases causing relative motion among fluid particles. Peer studies that have attempted to extend Biot’s poroelasticity to include capillary effects find a) step change in fast P-wave velocity of up to 5% between sonic and ultrasonic frequency ranges, and b) that the medium becomes dispersive in with respect to the slow P-wave velocity. This paper, for the first time, presents a model to quantify the capillary effects on velocity. Results show the value of incorporating capillary effects in well-to-seismic tie and for understanding the loss mechanism in ultrasonic laboratory measurements.
Presentation Date: Tuesday, September 26, 2017
Start Time: 9:45 AM
Location: Exhibit Hall C, E-P Station 4
Presentation Type: EPOSTER
