Tertiary basin-and-range structure in Southern Nevada-Utah-Arizona region via borehole, seismic reflection, and Bouguer gravity data: Insights on hydrocarbon potential
Conference
·
OSTI ID:6639206
Extension characterized by full grabens and half-grabens and tilted, folded, and faulted range blocks is geometrically and kinematically constrained by geologic and geophysical data. Rootless gravity-slide blocks are common secondary features to high-angle normal faults, which exert primary control over crustal extension. A synthetic seismogram from the only test well (Mobil Virgin River 1-A; TD = 5,962.5m), seismic reflection, and Bouguer gravity data (up to 70 mgal of relief) indicate over 7,600m of low-density Tertiary sediments in the Virgin Valley basin. Several thousand meters of sediment are within the oil-generative window. Neogene basalt flows suggest geothermal gradients higher than today. Lacustrine limestone in the Oliocene-Miocene Horse Spring Formation contains cryptalgalaminate, a potential hydrocarbon source. The Horse Spring Formation is overlain unconformably by the Miocene-Pliocene Muddy Creek Formation. These formations were deposited in association with movement on the Virgin-Beaver Dam Mountains fault, as indicated by fanning-upward reflector geometry. The formations are incorporated into a major rollover anticline. Mississippian Chainman Shale, penetrated to the west by Chevron's Colorock Quarry well, indicates a possibility for Sevier-age hydrocarbon generation by thrust loading.
- OSTI ID:
- 6639206
- Report Number(s):
- CONF-880301-
- Country of Publication:
- United States
- Language:
- English
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02 PETROLEUM
020200* -- Petroleum-- Reserves
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& Exploration
ANTICLINES
ARIZONA
CENOZOIC ERA
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GEOLOGIC AGES
GEOLOGIC DEPOSITS
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020200* -- Petroleum-- Reserves
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& Exploration
ANTICLINES
ARIZONA
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DATA ANALYSIS
ELECTRON MICROSCOPY
EXPLORATION
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SEDIMENTARY ROCKS
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USA
UTAH