Analysis of a Valmeyeran (middle Mississippian) Aux Vases sandstone reservoir

Conference · Tue Aug 01 04:00:00 EDT 1989 · AAPG Bulletin (American Association of Petroleum Geologists); (USA)

OSTI ID:5460803

Seyler, B ^[1]

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1. Illinois State Geological Survey, Champaign (USA)

Four closely spaced cores of the Aux Vases Sandstone near the Zeigler field in Franklin County allow detailed reservoir analyses of a typical problematic producer in Illinois. These cores show large lateral and vertical facies variations that influence reservoir quality and oil recovery. Reservoir analysis includes detailed core description, log analysis, cross-section construction, porosity and permeability measurements, petrographic analysis, x-ray diffraction, and scanning electron microscopy (SEM) with energy dispersive x-ray system analysis (EDS). These analyses were performed to determine reservoir geometry, environments of deposition, and to provide data to assist in design of drilling, completion, and recovery programs. Sedimentary structures and facies observed in these cores indicate deposition in a shallow marine subtidal to tidal-flat environment. The reservoir facies is interpreted as a sand-filled tidal channel. Reservoir-quality sandstone typically has approximately 24% porosity, greater than 100 md permeability, is cross bedded, and is poorly cemented. SEM/EDS, and x-ray diffraction analyses of reservoir samples show that the sand grains are coated with authigenic chlorite and illite clays.

• OSTI ID: 5460803
• Report Number(s): CONF-8909166--
• Conference Information: Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (USA) Journal Volume: 73:8
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
CLAYS
DEPOSITION
DIAGENESIS
ELECTRON MICROSCOPY
FEDERAL REGION V
GEOLOGIC DEPOSITS
GEOLOGIC FORMATIONS
ILLINOIS
MICROSCOPY
MINERAL RESOURCES
NORTH AMERICA
PERMEABILITY
PETROGRAPHY
PETROLEUM DEPOSITS
POROSITY
RESERVOIR ROCK
RESOURCES
ROCKS
SANDSTONES
SCANNING ELECTRON MICROSCOPY
SEDIMENTARY ROCKS
USA