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The AAPG/Datapages Combined Publications Database
Journal of Petroleum Geology
Abstract
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Journal of Petroleum Geology, Vol.
RESERVOIRS
IN THE NEOGENE EAST SLOVAKIAN BASIN PART 1:
A PETROGRAPHIC EXAMINATION OF LITHOLOGY, POROSITY,
AND DIAGENESIS
* Earth Sciences and Resources
Institute, University of South Carolina, Columbia, South
Carolina, 29208, USA.
Present address: Westinghouse Savannah River Company, 742-A, PO
Box 616, Aiken, South Carolina, 29208, USA.
** Department of Geological Sciences, University of South
Carolina, USA.
*** Maxus Energy Corporation, Dallas, Texas 75201, USA.
Abstract
reservoirs
.
Reservoir development is largely dependent on the original
sandstone composition, which is influenced by deposition in a
deltaic
setting, local sourcing and volcanic activity. Sandstones
are texturally and mineralogically immature lithic and
feldspathic arenites. The presence of unstable lithic grains and
feldspars contributes to low, irregular reservoir porosity, due
to deformation by compaction, and susceptibility to chemical
alteration. Reservoir quality is also influenced by the
subsequent diagenesis of the sandstones, which is driven by high
heat flow. Lithic fragments and feldspars alter readily to form
authigenic/diagenetic mineral suites, which tend to occlude
porosity, however, dissolution of some of these grains also
enhances secondary porosity development. Most observed porosity
in the basin sandstones is secondary, developing from dissolution
of both carbonate cement and unstable framework grains.
Porosities suggest a weak decreasing trend with depth of burial.
However, detailed examination of several localities reveals that
porosity development is strongly influenced by local factors
(e.g. structural evolution, sandstone lithology, and the
distribution of volcanics). Sandstones of the East Slovakian
Basin are generally not good hydrocarbon
reservoirs
(particularly
for liquid hydrocarbons), due to the presence of unstable
framework grains, early carbonate cementation and
authigenic/diagenetic mineral suites. Exceptions are found when
dissolution of cement and framework grains results in significant
secondary porosity.
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