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Reservoir compaction and surface subsidence in the Central Luconia gas bearing carbonates, offshore Sarawak, East Malaysia

Conference · · Soc. Pet. Eng. AIME, Pap.; (United States)
OSTI ID:5957219
;
In the Central Luconia area, offshore Sarawak, substantial gas reserves are present in Miocene carbonate buildups. The carbonates consist of limestones and dolomites with porosities ranging from 0 to 40 percent. From core analysis it became evident that there exists a potential problem with regard to the compaction of the carbonate reservoir matrix as a result of effective stress increase as the reservoirs are depleted. Triaxial compaction tests were carried out on core samples from several carbonte reservoirs. It was found that highly porous mouldic limestones show pore collapse at relatively low effective stresses. After pore collapse the uniaxial compressibility coefficient increases significantly. Reservoir compressibility parameters can be derived from core data, for collapsing as well as non-collapsing rocks. These can be used to calculate reservoir compaction from well logs for a particular pressure decline. An estimate of the expected surface subsidence can be made based on the theory of poro-elasticity and the nucleus of strain concept as described by Geertsma. Predicted subsidence figures have been taken into account in platform design. The gas reservoirs have large aquifers within the carbonate buildups. As these aquifers have not all been fully appraised, there exists some uncertainty concerning their actual compaction behaviour.
Research Organization:
Sarawak Shell Berhad
OSTI ID:
5957219
Report Number(s):
CONF-8402115-
Conference Information:
Journal Name: Soc. Pet. Eng. AIME, Pap.; (United States) Journal Volume: SPE 12400
Country of Publication:
United States
Language:
English

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Related Subjects

03 NATURAL GAS
030200* -- Natural Gas-- Reserves
Geology
& Exploration
ALKALINE EARTH METAL COMPOUNDS
AQUIFERS
ASIA
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATE ROCKS
CARBONATES
CENOZOIC ERA
COMPRESSIBILITY
DOLOMITE
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GROUND SUBSIDENCE
LIMESTONE
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MALAYSIA
MECHANICAL PROPERTIES
MECHANICS
MINERAL RESOURCES
MINERALS
NATURAL GAS DEPOSITS
OFFSHORE PLATFORMS
OFFSHORE SITES
OXYGEN COMPOUNDS
POROSITY
PRESSURE GRADIENTS
RESERVOIR ROCK
RESOURCE DEPLETION
RESOURCE POTENTIAL
RESOURCES
ROCK MECHANICS
ROCKS
SEDIMENTARY ROCKS
STRESSES
TERTIARY PERIOD
WELL LOGGING