4D Seismic Feasibility Study Based on an Integrated Reservoir Model Conference Paper uri icon

abstract

  • Time-lapse seismic monitoring of producing reservoirs presents strong potential for improving reservoir management. We have implemented a high speed simulation combining streamline fluid flow and ray-Born seismic modeling to examine feasibility and uncertainty of such monitoring. The simulation is applied to an 80% gas-saturated reservoir model with stochastic models of porosity and permeability. We then apply a rapid streamline fluid simulation. The petrophysical, pore pressure and fluid saturation data provide the basis for predicting time-dependent elastic properties of the reservoir using the Gassmann equation. Bulk moduli for the solid grains and fluid properties were chosen to represent reservoir conditions at a depth of 2 km, and dry rock bulk and shear moduli were chosen with the empirical equation from the laboratory data. Given these parameters from the Gassmann equation, a ray-Born algorithm provides a high speed, 3-D simulation of seismic data. We find that the seismic amplitude change before and after water injection is large enough to be seismically visible in the high porosity regions of the reservoir, but the change in low porosity regions is small and may be masked if the signal-to-noise ratio is small. The pore pressure change is also a critical reservoir property that influences the seismic amplitude. Uncertainty of the dry bulk modulus has less influence in high porosity regions than in low porosity regions.

author list (cited authors)

  • Yuh, S. H., Yoon, S., Gibson, R. L., & Datta-Gupta, A.

citation count

  • 2

publication date

  • May 2000