Mixed Carbonate-Siliciclastic Sequences

The study of carbonate-siliciclastic mixed sequences has seen an increase in the number of investigations that focus on mixed settings as part of the continuum between the carbonate and clastic end members. Cyclic deposition in mixed basins by reciprocal sedimentation has become one of the foundation blocks for sequence stratigraphy. In addition, these mixed sequences have a variety of distinctive petroleum reservoir characteristics, important for both exploration and development programs. The emphasis now is on reevaluating ancient sequences in the light of a more dynamic understanding of spatial and temporal variations and controls on these sequences. Examples in this volume are subdivided under the following headings: Shelf Wide, Coastal and Inner Shelf, Middle to Outer Shelf, Slope to Basin and Paleokarst. Many mixed sequences have been described in the literature, but understanding the controls of these sequences from a process approach in now in an adolescent stage.
Interrelationship of Platform Dolostone and Silicic Siltstone Facies - Grayburg Formation (Permian), Central Basin Platform and Ozona Arch, Permian Basin, West Texas Available to Purchase
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Published:January 01, 1991
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CiteCitation
Don G. Bebout, 1991. "Interrelationship of Platform Dolostone and Silicic Siltstone Facies - Grayburg Formation (Permian), Central Basin Platform and Ozona Arch, Permian Basin, West Texas", Mixed Carbonate-Siliciclastic Sequences, Anthony J. Lomando, Paul M. Harris
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Abstract
Early Guadalupian Grayburg dolostones and siltstones accumulated on shallow-water to exposed platforms that encircled the Midland Basin, West Texas. The Grayburg Formation is the uppermost of several upward-shoaling sequences of the lower Guadalupian and is transitional between the dolostone strata of the underlying San Andres Formation and the siltstone and anhydrite of the overlying Queen Formation. The siltstone and silty dolostone units within the Grayburg mark the base of a number of thinner, upward-shoaling cycles.
In Dune Field, Central Basin Platform, siltstones and silty dolostones are associated with subtidal fusulinid wackestones to supratidal pisolite wackestone to grainstone; in some areas a single marker is associated with this entire range of depositional environments. Most of the siltstone cores exhibit structures interpreted to have developed under subaqueous conditions. In Farmer Field, Ozona Arch, siltstones mark the base of many thin cycles within the reservoir section.