Characterization of oil and gas reservoir heterogeneity Page: 26 of 232
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concentrated along the eastern margin of the Central Basin Platform but also occur along the
rimming shelves (fig. 11-5).
The Grayburg Formation as exposed in the Guadalupe Mountains (figs. II-1 and 11-2)
defines the northwestern rim of the Delaware Basin during Grayburg time, but precise
definition of the Grayburg shelf edge in outcrop has proved difficult because of massive erosion
and truncation marking the Grayburg/Queen sequence boundary (fig. II-4b) (Fekete and others,
1986, Franseen and others, 1989).
Guadalupian-aged Grayburg strata exposed in the Guadalupe Mountains compose a mixed
siliciclastic-carbonate third-order depositional sequence (terminology of Mitchum and others,
1977) deposited on the Northwestern Shelf of the Delaware Basin. Dickey (1940) defined the
Grayburg Formation type section in the Cecil H. Lockhart Root Permit No. 2 well from the
Grayburg-Jackson field in Eddy County, New Mexico. Since that time several authors have
variously defined its boundaries in outcrop, sometimes including the Grayburg in the Queen
Formation (Skinner, 1946) or incuding within the Grayburg uppermost San Andres strata
(Boyd, 1958; Moran, 1962). Tait and others (1962) collected the Grayburg with other post-San
Andres strata of the Guadalupian Series (Queen, Seven Rivers, Yates, and Tansill Formations)
into the Artesia Group, referring to the outcrop belt near Artesia, eastern New Mexico. As
mapped by Hayes and Adams (1962) and Hayes (1964), the Grayburg Formation in the Algerita
Escarpment/Shattuck Valley study area comprises an interval of interbedded siliciclastic and
carbonate rocks overlying, locally unconformably, the carbonate-dominated San Andres
Formation. The Grayburg underlies the siliciclastic-rich Queen Formation from which it is
separated by a "locally conspicuous sandstone" (Hayes, 1964) that is "thicker than any of those
in the Grayburg" (Hayes and Adams, 1962). The most recent field studies have shown that
conspicuous karsted surfaces (sequence boundaries) occur at the top and base of the Grayburg
Formation in the southern and central Guadalupe Mountains (Fekete and others, 1986; Kerans
and Nance, 1991). The Grayburg interval on the Central Basin Platform is lithologically similar16
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Tyler, N.; Barton, M. D.; Bebout, D. G.; Fisher, R. S.; Grigsby, J. D.; Guevara, E. et al. Characterization of oil and gas reservoir heterogeneity, report, October 1, 1992; Austin, Texas. (https://digital.library.unt.edu/ark:/67531/metadc1446163/m1/26/?q=j+w+gardner: accessed July 4, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.