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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 69 (1985)

Issue: 2. (February)

First Page: 278

Last Page: 278

Title: Processes Involved in Previous HitSaltNext Hit-Previous HitDomeNext Hit Development II: Thermal, Gravitational, and Chemical Effects: ABSTRACT

Author(s): I. Lerche, J. J. O'Brien

Article Type: Meeting abstract


The quantitative investigation of processes involved in Previous HitsaltNext Hit Previous HitdomeNext Hit development include thermal, gravitational, and chemical effects of uprising Previous HitsaltNext Hit domes. We find that (a) there must be a positive-temperature anomaly occurring around the upper flanks of a Previous HitsaltNext Hit Previous HitdomeNext Hit but that organic maturation is typically so low that the resulting enhanced maturation is still insignificant for hydrocarbon generation, (b) there must be a negative temperature anomaly occurring around the lower flanks of a Previous HitsaltNext Hit Previous HitdomeNext Hit that significantly inhibits overmaturation of hydrocarbons and so enlarges the hydrocarbon window, (c) the magnitude of the negative gravity anomaly associated with a Previous HitsaltNext Hit Previous HitdomeNext Hit, that is predicted by an equilibrium model of gravitational instability is much smaller than the observ d values, implying that Previous HitsaltNext Hit domes are inhibited in their development either by lateral sediment strength, undercompaction of the overlying or surrounding sediments, or by the available supply of Previous HitsaltTop, (d) the 4 major current suggestions for cap-rock formation discussed in the literature have serious deficiencies; none of them is capable of supplying enough anhydrite for the observed thicknesses of cap rocks. Permeability enhancement by 2 orders of magnitude is required for any of these processes to be viable. A method for producing such an enhancement is based on fluid characteristics in a generalized sandstone and shale section.

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