Reservoir compaction and surface subsidence in the Central Luconia gas bearing carbonates, offshore Sarawak, East Malaysia
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-
- Journal Information:
- Soc. Pet. Eng. AIME, Pap.; (United States), Vol. SPE 12400; Conference: 5. Southeast Asia offshore technical conference, Singapore, Singapore, 21 Feb 1984
- Country of Publication:
- United States
- Language:
- English
Similar Records
Reservoir development in Miocene carbonates, Central Luconia Province, offshore Sarawak
Reservoir geology of the F6 Field, offshore Sarawak, Malaysia
Related Subjects
MALAYSIA
NATURAL GAS DEPOSITS
RESERVOIR ROCK
COMPRESSIBILITY
GROUND SUBSIDENCE
POROSITY
RESOURCE DEPLETION
ROCK MECHANICS
WELL LOGGING
AQUIFERS
CARBONATE ROCKS
DOLOMITE
LIMESTONE
OFFSHORE PLATFORMS
OFFSHORE SITES
PRESSURE GRADIENTS
RESOURCE POTENTIAL
STRESSES
TERTIARY PERIOD
ALKALINE EARTH METAL COMPOUNDS
ASIA
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATES
CENOZOIC ERA
GEOLOGIC AGES
GEOLOGIC DEPOSITS
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MECHANICAL PROPERTIES
MECHANICS
MINERAL RESOURCES
MINERALS
OXYGEN COMPOUNDS
RESOURCES
ROCKS
SEDIMENTARY ROCKS
030200* - Natural Gas- Reserves
Geology
& Exploration