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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
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AAPG Bulletin, V.
1Manuscript received September 2,
1998; revised manuscript received October 15, 1999; final acceptance December
15, 1999.
2Department of Geology, Auburn University,
Auburn, Alabama 36849; e-mail: [email protected]
ABSTRACT
magnitude
,
to preserve overpressure for more than 250 m.y. The predicted present-day
gas window is located within the overpressure zone, suggesting that the
volume increase associated with the oil-to-gas conversion may be attributed
to present overpressures. The native sulfur deposits likely formed in a
fluid mixing zone resulting from the Laramide uplift of the western basin
during the Tertiary. In our model, meteoric water recharged along the basin's
uplifted western margin and discharged basinward. Hydrocarbons migrated
landward by pressure gradients and buoyancy and discharged upward along
faults in the western basin, where they mixed with meteoric water. Many
oil and mineral reservoirs may have formed in the fluid mixing zone, where
extensive chemical reactions take place. In the Culberson sulfur ore district,
for example, fluids including hydrocarbons and meteoric water migrated
upward through faults from underlying carrier beds, into the Permian Salado
limestone. There, the mixture of fluid drives biochemical reactions that
precipitate native sulfur.
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