--> ABSTRACT: The Control of High-Frequency Sequences on the Distribution of Shoreline and Fluvial Reservoir Facies: An Example from the Ferron Sandstone, Utah, by Coco Van Den Bergh, A. R. Sprague; #91020 (1995).

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The Control of High-Frequency Sequences on the Distribution of Shoreline and Fluvial Reservoir Facies: An Example from the Ferron Sandstone, Utah

Coco Van Den Bergh, A. R. Sprague

A sequence stratigraphic framework has been established for a fifteen-kilometer long portion of the Turonian Ferron Sandstone outcrop in Southeastern Utah. In the study area, the Ferron Sandstone is 150 meters thick and consists of a lower deltaic section and an upper non-marine section. At least six high-frequency sequences have been identified.

In the lower deltaic section, three sequences have been documented. These sequences are comprised of a basal sequence boundary overlain by a mudrock-dominated delta plain facies association. This succession is capped by a major flooding surface that is overlain by a progradational parasequence set, composed of river-dominated shoreline parasequences. This parasequence set is truncated by the sequence boundary at the base of the next sequence. Up to 30 meters of erosion by the sequence boundaries has been documented.

In the upper non-marine section, at least three sequences are recognized. These sequences consist of a lower interval dominated by coarse-grained, multi-storey sandstone bodies and an upper interval dominated by muddy coastal plain facies. The multi-storey sandstone bodies are channel-fill complexes, composed of laterally connected and/or vertically amalgamated channel fills. The channel-fill complexes are up to 20 meters thick and more than one kilometer wide. They are interpreted as the deposits of confined systems of multiple low-sinuosity fluvial channels that developed directly on the sequence boundary in an updip position.

AAPG Search and Discovery Article #91020©1995 AAPG Annual Convention, Houston, Texas, May 5-8, 1995