Facies analysis and petrophysical characteristics of the Jurassic Smackover formation, Conecuh embayment, Alabama-Florida.
Item
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Title
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Facies analysis and petrophysical characteristics of the Jurassic Smackover formation, Conecuh embayment, Alabama-Florida.
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Identifier
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AAI9000714
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identifier
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9000714
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Creator
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Melas, Faye F.
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Contributor
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Adviser: Gerald M. Friedman
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Date
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1989
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Language
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English
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Publisher
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City University of New York.
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Subject
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Geology
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Abstract
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Carbonate reservoir rocks are heterogeneous and no one model may embrace all the different kinds of carbonate reservoirs. However, studies which include sedimentologic and petrophysical information and effect of wettability in carbonate rocks represent a first step when Enhanced Oil Recovery (EOR) methods are considered.;Detailed sedimentologic and petrophysical studies of the Smackover carbonates in the Conecuh Embayment indicate that petrophysical parameters such as porosity, effective porosity, irreducible water saturation, pore-throat sorting, and displacement pressure (i.e., pore throat size), reflect the shape of the mercury-capillary-pressure curves to which they correspond. As such, mercury-capillary-pressure curves are adequate for a comprehensive description of the pore geometry.;The Smackover carbonates are classified in terms of their capillary-pressure curves into reservoir and nonreservoir facies. Steeply-sloping curves with flat plateaus correspond to reservoir samples with medium- to high-porosity and effective porosity values, well-sorted pore-size distribution, low-displacement pressures, and relatively low irreducible water saturations. Gently-sloping curves with steep plateaus or no plateau correspond to nonreservoir facies with low-porosity and effective porosity values, poorly-sorted pore-size distribution, high-displacement pressures, and high irreducible water saturations. Because late anhydrite cement has in places altered the petrophysical characteristics of the carbonates, the key criterion used to distinguish reservoir and nonreservoir facies was the pore-size distribution, which was not affected by the anhydrite cement.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
