Clastic facies and diagenesis, Lewis-Evans interval in Black Warrior Basin
Subsurface maps of the Lewis and Evans sandstone-facies tracts (Chester Group) on the northern shelf of the Black Warrior basin document two distinct deltaic depositional systems, each having a source area from the Mid-Dontinent interior. Within the Lewis genetic interval, six dip-elongate, river-dominated, cratonic delta lobes comprise the principal coarse-grained clastic units. However, in the higher Evans interval, five strike-elongate (cuspate) wave-dominated lobes are present on the northwestern rim of the basin. Petrographic evidence from four Mississippi cores associated with delta-plain and delta-front facies in the two sandstone unites indicates a dominance of monocrystalline quartz and chert rock fragments and a relative absence of orogenic indicators such as polycrystalline quartz, muscovite, and metamorphic rock fragments. Porosity development results largely from the formation of moldic secondary porosity and enlarged intergranular porosity. Primary porosity is occluded by the precipitation of quartz overgrowths and early calcite cement. Secondary moldic porosity was generated through the dissolution of feldspars and shale fragments. Enlarged intergranular porosity resulted from the dissolution of detrital illite matrix. Secondary porosity itself is partially occluded by authigenic kaolinite and illite, as well as by late-stage pyrite and dolomite.
- OSTI ID:
- 6921447
- Report Number(s):
- CONF-880301-
- Country of Publication:
- United States
- Language:
- English
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ALUMINIUM COMPOUNDS
ALUMINIUM SILICATES
CATAGENESIS
CHALCOGENIDES
CLAYS
COASTAL REGIONS
EXPLORATION
FELDSPARS
GEOLOGIC DEPOSITS
GEOLOGY
ILLITE
IRON COMPOUNDS
IRON SULFIDES
KAOLINITE
MAPS
METAMORPHIC ROCKS
MINERAL RESOURCES
MINERALOGY
MINERALS
MISSISSIPPI RIVER
NATURAL GAS DEPOSITS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PETROGRAPHY
PETROLEUM DEPOSITS
POROSITY
PYRITE
QUARTZ
RESOURCES
RIVER DELTAS
RIVERS
ROCKS
SEDIMENTARY ROCKS
SEDIMENTATION
SHALES
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
SILICON OXIDES
STREAMS
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
SURFACE WATERS
TRANSITION ELEMENT COMPOUNDS