Rock compressibility, compaction, and subsidence in a high-porosity Chalk Reservoir

Journal Article · Sat Jul 01 00:00:00 EDT 1989 · Journal of Petroleum Technology; (USA)

OSTI ID:5537394

Ruddy, I ^[1]; Andersen, M A; Pattillo, P D; Bishiawi, M ^[2]; Foged, N ^[3]

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1. Amoco Norway Oil Co. (US)
2. Amoco Production Co., Tulsa, OK (USA)
3. Danish Geotechnical Inst. (US)

A case study of the North Sea Valhall chalk reservoir demonstrates the significant impact that rock compressibility can have on field performance. Porosity reduction, reservoir interval compaction, and seabed subsidence have been observed in conjunction with reservoir pressure depletion. Full-diameter samples from a recently cut core of the unconsolidated high-porosity chalk were subjected to a series of uniaxial-strain experiments to determine compaction and PV compressibility. The laboratory measurements were corrected to field stress rates and pressure, and porosity-dependent rock-compressibility curves were developed. The uniaxial compaction data were used both in a reservoir model to recognize the significant additional reservoir energy resulting from the lithic drive of large-scale rock compaction and in a subsidence model to predict the impact of reservoir depletion on seabed displacements.

• OSTI ID: 5537394
• Journal Information: Journal of Petroleum Technology; (USA), Vol. 41:7; ISSN 0022-3522
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
NORTH SEA
RESERVOIR ROCK
COMPRESSIBILITY
EXPERIMENTAL DATA
FIELD TESTS
OIL FIELDS
POROSITY
RESERVOIR PRESSURE
STRESS ANALYSIS
ATLANTIC OCEAN
DATA
GEOLOGIC DEPOSITS
INFORMATION
MECHANICAL PROPERTIES
MINERAL RESOURCES
NUMERICAL DATA
PETROLEUM DEPOSITS
RESOURCES
SEAS
SURFACE WATERS
TESTING
020200* - Petroleum- Reserves
Geology
& Exploration