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- W8821497 abstract "Salt domes of the Gulf Coast region of the United States consist of four component parts: 1) a salt stock, 2) caprock material, 3) sheath material, and 4) the surrounding upturned sediments. Salt stock consists of remarkably pure halite (NaCl), which represents 90 to 99% of the total mass, with the major impurity being anhydrite. Salt stocks are markedly homogeneous and continuous with respect to composition, texture and structure. Caprock consists primarily of anhydrite, gypsum and calcite which commonly occur in monomineralic zones oriented roughly parallel to the top of the salt stock. Caprock composition varies markedly over any single salt stock as well as from one salt stock to another. Fracturing, porosity and permeability of caprock material are correspondingly variable, but are usually developed tto a higher degree in the upper portions of caprock; porosity and permeability may also be relatively high at the caprock-salt interface. Caprock is generally believed to form by residual accumulation of anhydrite from the dissolution of salt, with subsequent alteration of the anhydrite to calcite and gypsum. Sheath material, probably a mixture of sedimentary rocks (clastic and evaporite), formed as a result of mechanical interaction between the salt stock and surrounding sediments during diapirism.more » Sheath material is thought to be distributed throughout an external zone, consisting mainly of disturbed sediment, and an internal zone, consisting mainly of disturbed salt. Sheath material forms along a roughly cylindrical shear zone which encloses thesalt stock. Sheath material may be overpressured and is generally thought to be impermeable. Upturned sediments around the salt diapirs are the result of dome genesis; hovever, these sedimentary beds and other structures are beyond the scope of this report.« less" @default.
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- W8821497 date "1983-01-01" @default.
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- W8821497 title "Salt, caprock, and sheath study" @default.
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