Lower Cretaceous (Neocomian Age) Calvin limestone shelf-margin complex, Natchitoches Parish, Louisiana

Conference · Sat Sep 01 04:00:00 EDT 1990 · AAPG Bulletin (American Association of Petroleum Geologists); (USA)

OSTI ID:5967674

Sullivan, P A ^[1]; Loucks, R G ^[2]

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1. ARCO Oil and Gas Co., Lafayette, LA (USA)
2. ARCO Oil and Gas Co., Plano, TX (USA)

The Calvin Limestone is a Lower Cretaceous (Neocomian age) carbonate shelf margin complex. This carbonate complex is stratigraphically located between the Winn Limestone and the Knowles Limestone (Tithonian age). Regional geologic and seismic correlations show this shelf margin to be stratigraphically equivalent with the Calvin Sandstone, Calvin field, Winn Parish, Louisiana. The potential reservoirs in the Calvin Limestone are identified as lithocodium encrusted coral/stromatoporoid boundstone and as rubbly coral/stromatoporoid grainstones formed in areas of high wave energy associated with the reef growth along the shelf margin. These shelf margin facies are limited in an updip (shelfal) direction, as they grade into a wackestone inner shelf lithofacies. The cores from the ARCO Huffman-McNeely Natchitoches Parish, Louisiana, represent slope (grainstones and packstones), shelf-margin (boundstone and grainstone), and the inner shelf (wackestone) carbonate facies. The Calvin Limestone contains microporosity, resulting from the recrystallization of former Mg-Calcite allochems to subhedral to euhedral microrhombic calcite crystals ranging from 1 to 5 {mu} in size. The predominant recrystallized material is Lithocodium, a problematical green algae. The excellent textural preservation and minimicrite crystal size of the nonporous portions of Lithocodium grains suggest that these grains were originally Mg-Calcite. No originally aragonite allochem or equant calcite cements are now microrhombic calcite. The microporosity associated with the boundstone and grainstone facies is the predominant pore network present in the deeply buried Calvin Limestone (>15,000 ft). This deep occurrence suggests that microporosity associated with microrhombic calcite may have excellent preservation potential with burial.

• OSTI ID: 5967674
• Report Number(s): CONF-9010204--
• Conference Information: Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (USA) Journal Volume: 74:9
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
58 GEOSCIENCES
580000 -- Geosciences
ALKALINE EARTH METAL COMPOUNDS
CALCITE
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATE ROCKS
CARBONATES
CONTINENTAL MARGIN
CORRELATIONS
CRETACEOUS PERIOD
DEPOSITION
DRILL CORES
FEDERAL REGION VI
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOPHYSICAL SURVEYS
GROUND WATER
HYDROGEN COMPOUNDS
LIMESTONE
LOUISIANA
MESOZOIC ERA
MINERAL RESOURCES
MINERALS
NORTH AMERICA
OXYGEN COMPOUNDS
PETROLEUM DEPOSITS
POROSITY
RESERVOIR ROCK
RESOURCES
ROCKS
SANDSTONES
SEDIMENTARY ROCKS
SEDIMENTS
SEISMIC SURVEYS
SURVEYS
USA
WATER