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H2S-Related Porosity and Sulfuric Acid Oil-Field Karst

By
Carol A. Hill
Carol A. Hill
Consulting Geologist Albuquerque, New Mexico, U.S.A.
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Published:
January 01, 1995

Abstract

“H2S-related porosity” refers to porosity created in a H2S system where dissolution can be produced by the mixing of waters of different H2S content or by the oxidation of H2S. “Sulfuric acid oil-field karst” refers to a specific kind of H2S-related porosity where carbonate reservoirs of cavernous size have been dissolved by a sulfuric acid mechanism. In a H2S system, porosity can be produced entirely in the deep subsurface and does not have to represent a paleokarst surface or dissolution in the shallow-phreatic or vadose zones.

H2S-related porosity is characterized by the large volume of hydrocarbons it can host, by extensive fracture permeability interconnected with “sponge-work” cavities or caves of tens to hundreds of meters in extent, by porosity related to structural and/or stratigraphic traps, and by the presence of high uranium and/or iron. Possible examples of H2S-generated porosity systems are the Lisburne field, Prudhoe Bay, Alaska, and some of the extremely productive fields of the Middle East.

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Contents

AAPG Memoir

Unconformities and Porosity in Carbonate Strata

David A. Budd
David A. Budd
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Arthur H. Saller
Arthur H. Saller
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Paul M. Harris
Paul M. Harris
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American Association of Petroleum Geologists
Volume
63
ISBN electronic:
9781629810843
Publication date:
January 01, 1995

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