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Sequence stratigraphy of the upper San Andres and Grayburg formations, Waddell Field, Crane County, Texas
implications for hydrocarbon reservoir distribution
x, 95 leaves : illustrations, maps ; 28 cm.
activity includes infill drilling and varying enhanced
and only down-dip from the inter- and supratidal facies. Up-
Basin region and are extensive hydrocarbon reservoirs in the
cycles on the Northwest Shelf based on sequence geometry,
dip shallow and peritidal facies within the transgressive
eastern margin of the Central Basin Platform has been
exclusively from the deep to shallow subtidal facies in the
formations-nations in the Waddell Field using cores, well
frequency sequences correspond to Guadalupian 12 and 13 high-
frequency sequences described on the Northwest Shelf. The
from the Grayburg Formation is also dominated by subtidal
in the Waddell Field (East Waddell Ranch) produce almost
interpretation was correlated to equivalent. strata on the
lithofacies in two high-frequency sequences. These two high-
logs, and outcrop analogs. The sequence stratigraphic
model divides the formation into two highfrequency cycles
Northwest Shelf and compared to known reservoir horizons in
peloidal facies and migrates towards the eastern margin of
platform and siliciclastic progradation occurred. Production
platform position and high-frequency cycle type. Reservoirs
producing hydrocarbons since 1935 and current engineering
production is dominant in deep to shallow subtidal
recovery strategies. This study establishes a sequence
region. The Waddell Field (East Waddell Ranch) on the
San Andres and Grayburg formations are separated by a Type I
sequence boundary during which subaerial exposure of the
stratigraphic framework for the upper San Andres and Grayburg
systems tracts and in the overlying high-stand systems tracts
the field, higher in the stratigraphy. The Grayburg sequence
The upper San Andres and Grayburg formations (Guadalupian)
the Waddell Field. On the western margin of the field,
transgressive systems tracts of each high-frequency sequence
were deposited on carbonate platforms around the Permian
which correspond to Guadalupian 14 and 15 high-frequency
Issued also on microfiche from Lange Micrographics.
Includes bibliographical references: pages 81-94.