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The Leading Edge; December 2000; v. 19; no. 12; p. 1286-1294; DOI: 10.1190/1.1438524
© 2000 Society of Exploration Geophysicists
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Cave Gulch 3-D Survey, Wind River Basin, Wyoming

A major gas discovery developed using poststack depth migration

Steven Natali, Roy Roux, Peter Dea and Fred Barrett

Barrett Resources Corporation, Denver, Colorado, U.S.

Corresponding author: snatali@BRR.com

The first 20% of the full text of this article appears below.

Waltman Arch, a transbasinal arch that trends northward across the Wind River Basin of central Wyoming, is overridden by the Owl Creek Thrust at its northern terminus (Figures 1 and 2). Fields along Waltman Arch produce from multiple stacked sandstone pays in the Fort Union, Lance, Meeteetse, Mesa Verde, Frontier, Muddy, and Lakota Formations (Figures 3 and 4). To the northwest, in Madden Field, there is excellent production from deeper Madison carbonates.


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  		Figure 1. Cave Gulch Field is in the eastern portion of the Wind River Basin, Wyoming. Waltman Arch is a transbasinal arch overridden by Owl Creek Thrust. The field is just beneath the lip of this thrust.

 

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  		Figure 2. The Cave Gulch 3-D survey lies at the north end of Waltman Arch. The trace of Owl Creek Thrust is mapped at the leading edge of Precambrian granite. Seismic line A-A' across Waltman Arch is shown in Figure 3.

 

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  		Figure 3. This 2-D seismic line shows that Waltman Arch is created by a deep-seated thrust fault that forms its western margin.

 

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  		Figure 4. Idealized cross-section of the northern edge of Waltman Arch as it is overridden by the Owl Creek Thrust. Tertiary and Cretaceous reservoirs productive at depth are exposed in near-vertical beds at the surface.

 
McPeek et al. present the history and development of the Cave Gulch prospect in their AAPG papers (1997, 1998). The prospect incorporated the Waltman 1 well in SW 31-37N-86W, Natrona County, Wyoming, which had more than 12 billion ft3 of gas in productive formations dipping to the southwest. The well had never been offset to the northeast. Subsurface control and dipmeter information in two other wells further constrained the prospect. Waltman 3, a marginal well, encountered northwest-dipping Lance formation. Bullfrog 1–6, while basically nonproductive in shallow horizons, had south dips. Mapping available 2-D seismic data in . . . [Full Text of this Article]




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