Porosity and permeability in phylloid algal buildup, Nena Lucia No. 112, Nena Lucia field, Nolan County, Texas

Conference · Wed Apr 01 04:00:00 EST 1992 · AAPG Bulletin (American Association of Petroleum Geologists); (United States)

OSTI ID:6969448

Locklin, J A ^[1]

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1. Texaco Exploration and Production Technology Department, Houston, TX (United States)

Examination of Middle Pennsylvanian (Desmoinesian) core from the Nena Lucia No.112 well reveals limestone facies associated with phylloid algal buildups. The facies include crinoidal, pelletal-foraminiferal, algal-plate, algal-intraclast, and terrigenous siliciclastics. Comparison of the core with well logs and measured core porosity and permeability data indicates that the best continuous porosity and permeability are associated with the algalplate facies (porosity to 20%, permeability exceeding 400 md). Petrographic examination of thin sections taken from the core shows that porosity is mainly secondary. The original algal plates, outlined by micrite envelopes, have been leached and partially filled by equant calcite. Shelter porosity, occurring beneath the algal plates, and open fractures, also contribute to total porosity. Moldic and fracture porosity are also dominant in the pelletal-foraminiferal and algal intraclast facies. However, continuous porosity and permeability are considerably lower in these facies (porosity less than 10%, permeability less than 5 md). The crinoidal and terrigenous siliclastic facies are generally nonporous.

• OSTI ID: 6969448
• Report Number(s): CONF-9204139--
• Conference Information: Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (United States) Journal Volume: 76:4
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
ALGAE
CARBONATE ROCKS
CARBONIFEROUS PERIOD
DEVELOPED COUNTRIES
DRILL CORES
FEDERAL REGION VI
GEOLOGIC AGES
GEOLOGIC DEPOSITS
LIMESTONE
MINERAL RESOURCES
NATURAL GAS DEPOSITS
NORTH AMERICA
PALEONTOLOGY
PALEOZOIC ERA
PERMEABILITY
PETROGRAPHY
PETROLEUM DEPOSITS
PLANTS
POROSITY
RESERVOIR ROCK
RESOURCES
ROCKS
SEDIMENTARY ROCKS
TEXAS
USA