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Abstract: Integration of Geology, Non-Seismic Geophysics and Seismic Data in a Structurally Complex, Frontier Oil Play: Northern Sangre de Cristo Mountains/Northeast San Luis Basin, Colorado

Thomas A. Watkins, John S. Belcher, Robbie Gries, Mark B. Longacre

The discovery of live Cretaceous oil in mineral exploration drill holes, followed by the identification of Mesozoic sediments in outcrop and in shallow drill holes, has lead to an integrated approach to exploration of a structurally complex, frontier oil play in south-central Colorado. Gravity, aeromagnetic, magnetotelluric (MT), and time domain electromagnetic (TDEM) data were acquired and interpreted in the initial stages of the project. Models derived from the geophysical data were augmented with geologic field work to explain specific anomalies. Interpretation of the gravity data was constrained by density measurements on representative rock samples collected in the field.

Seismic data, acquired in the most recent exploration stage, provided confirmation and modification of the basin margin geometry. Velocity data from the seismic was integrated with resistivity, density, magnetic and geologic data to predict lithologies on an intermediate fault block located between the Sangre de Cristo Mountains and the San Luis Basin.

AAPG Search and Discovery Article #90959©1995 AAPG Rocky Mountain Section Meeting, Reno, Nevada