High-resolution seismic mapping of a shallow petroleum reservoir ///

Using the Teapot Dome Field near Casper, Wyoming, US, as a test case, we demonstrate how high-resolution seismic surveys furnish a clearer picture of shallow reservoirs as well as the relationship between deep and shallow faults. The Upper Cretaceous Shannon Sandstone, the shallowest petroleum reservoir at Teapot Dome (about 250 to 650 ft (76-198 m)), can only be imaged properly with high-resolution seismic methods. We identify faults and deformation structures that penetrate and could potentially partition the Shannon reservoir. Integration of these results with information from conventional 3D seismic and well-log data suggests that at least some shallow faults have propagated from depth. Furthermore, high-resolution imaging provides a means to better constrain the location of faults mapped from well logs. High-resolution imaging becomes critical in cases of shallow reservoirs where it is important to understand compartmentalization of production, fluid communication between the deep and shallow reservoirs, or continuity of structures from depth into the shallow subsurface.

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