Chapter 17

ABSTRACT

In this paper, we present the feasibility of using seismic measurement techniques to map the fracture zones between wells spaced 800 m apart at a depth of 3000 m. The wells are in the fractured Twin Creek reservoir in the Utah-Wyoming Overthrust Belt. In particular, we want to demonstrate that fracture zones cannot be resolved by surface seismic measurements alone. Instead, it is more appropriate to use high-resolution crosswell seismic data. Surface seismic data244 integrated with well logs from the Lodgepole field are used to delineate the members of the Twin Creek carbonate reservoir. Petrophysical analysis provides the rock physical properties and thickness of the Leeds Creek, Watton Canyon, Boundary Ridge, and Rich members of the Twin Creek Formation. Surface seismic and horizontal well information delineates a fracture zone in the Watton Canyon Member. The result is a 12-layer model describing the fracture zone, with petrophysical parameters for each geological unit in the reservoir. We pre-sent the feasibility of transmitting seismic waves between two wells in the Twin Creek reservoir at a distance up to 800 m using synthetic interwell seismic data. We also show the geology, petrophysics, and migrated seismic data, which are used to describe the fractured zone, as well as the members used to produce the model for planning interwell seismic measurements.