Feasibility of Detecting Seismic Waves Between Wells at the Fractured Twin Creek Reservoir, Utah-Wyoming Overthrust Belt
Jorge O. Parra, Hughbert A. Collier, Burke G. Angstman, 1999. "Feasibility of Detecting Seismic Waves Between Wells at the Fractured Twin Creek Reservoir, Utah-Wyoming Overthrust Belt", Reservoir Characterization—Recent Advances, Richard A. Schatzinger, John F. Jordan
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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.
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Reservoir Characterization—Recent Advances
Optimum reservoir recovery and profitability result from guidance by an effective reservoir management plan. Success in developing the most appropriate reservoir management plan requires knowledge and consideration of (1) the reservoir system, including rocks, fluids, and rock-fluid interactions, as well as wellbores and associated equipment and surface facilities; (2) the technologies available to describe, analyze, and exploit the reservoir; and (3) the business environment under which the plan will be developed and implemented. Reservoir management plans de-optimize with time as technology and the business environment change or as new reservoir information becomes available. Reservoir characterization is the process of creating an interdisciplinary high-resolution geoscience model that incorporates, integrates, and reconciles various types of geological and engineering information from pore to basin scale. The reservoir data are then conceptually and quantitatively modeled and compared to the historical production data and fluid flow distribution patterns within and beyond the limits of the reservoir to match well production histories and predict their behavior. The goals of reservoir characterization are to simultaneously (1) maintain high displacement efficiency, (2) optimize high sweep efficiency, (3) provide reliable reservoir performance predictions, and (4) reduce risk and maximize profits. Notice that in addition to the technical concepts that we normally associate with "characterization," maximizing profits is an essential element of this process. Papers from the Fourth International Reservoir Characterization Technical Conference (1997), sponsored by the U.S. Department of Energy, this publication is a unique compilation of 27 papers covering every aspect of reservoir characterization and has been a popular AAPG publication since that time. Using an interdisciplinary approach, the papers address qualitative information as well as integrated quantified data and culminate in a fully integrated study.