| dc.description.abstract | Upper Red Fork sandstones within the study area exhibit a variety of facies associated with submarine fan development. Determination of submarine fan facies and their possible distribution may help to delineate depositional trends and stratigraphic trap plays of gas reservoir sandstones. The upper Red Fork interval is defined by marker beds above and below, each representing transgressive episodes. Thicknesses of this interval exceed 1,100 feet in a local upper Red Fork depocenter within the Anadarko Basin. Regional subdivision of this interval could not be made due to the absence of continuous stratigraphic marker beds. Data from 1,028 wire-line logs were used to construct various geologic maps and stratigraphic cross-sections vital to understanding the depositional facies trends. Core and petrographic analysis provided information used to interpret specific depositional facies. Rocks of the upper Red Fork interval consist primarily of interbedded siltstones and shales with intervals of fine to very fine-grained sandstones. Sandstones are composed predominantly of monocrystalline quartz, metamorphic rock fragments, and feldspar grains with lesser amounts of micas, polycrystalline quartz, chert, carbonaceous material, granophyre grains, shale clasts, and heavy minerals such as zircon. Primary porosity has been reduced significantly by compaction and cementation. Secondary porosity occurs as the result of dissolution of unstable grains and minor amounts of matrix. Pore-filling clay minerals include illite, chlorite, and kaolinite. | |
