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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
(Begin page 795)
AAPG Bulletin, V.
Diagenetic heterogeneity in
sandstone
at the outcrop scale, Breathitt
Formation (Pennsylvanian), eastern Kentucky
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Kitty L. Milliken1
1Department of Geological Sciences, University of Texas, Austin, Texas, 78712; email: [email protected]
AUTHORS
Kitty Milliken is a research scientist in the Department of
Geological Sciences, University of Texas at Austin, where she received an M.A. degree in
1977 and a Ph.D. in 1985. Her research interests focus on combining petrography and
geochemical analysis to decipher diagenetic history in sandstones, shales, and other
rocks. She is a member of AAPG, SEPM, and the Vagaries of Diagenesis
Fan Club.
ACKNOWLEDGMENTS
This study was supported by the Donors of the Petroleum Research Fund of the American Chemical Society (ACF-PRF 22805-AC8). Partial support of publication costs was provided by the Owen-Coates Fund of the Geology Foundation, University of Texas at Austin. Thin sections and the porosity and permeability measurements of plugs were provided by Exxon Production Research through the kind assistance of Stan Paxton. Rachel Eustice assisted in field work. I thank Robert Folk for his tremendously helpful explanations concerning the statistical analysis of closed data sets. The article benefited from constructive suggestions by Earle McBride and Rogeria Souza and from reviewers Sal Bloch, Mogens Ramm, and John D. Harper.
ABSTRACT
Twenty-seven samples of feldspathic phyllarenite were obtained from three 1 m grids in a large, homogeneous distributary-bar sand stone body with the goal of elucidating bed-scale diagenetic het erogeneity. Significant variability in the content of both detrital and diagenetic components is present in the sample set. This variation is within the range of values predicted from comparison with a large regional data set from the same formation, but nonetheless, it is large enough to preclude successful prediction of diagenetic prop erties from consideration of average composition and thermal his tory alone. Grain size is one important local control on the overall abundances of cement and porosity. Grain size operates to control the overall degree of cementation (in these particular rocks, indi rectly) through its influence on lithic grain content and, hence, on compaction. Relatively minor carbonate cement is an exception to this trend and appears to be distributed somewhat randomly, with out regard to the size or composition of the detrital components.
Diagenetic heterogeneity of the magnitude documented in this example is correlated to differences in porosity and permeability and therefore has implications for reservoir simulation and explo ration risk assessment. Prediction of rock properties through dia genetic modeling is more successful if the textural controls on dia genetic heterogeneity are considered.
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