Prediction of abrupt reservoir compaction and surface subsidence due to pore collapse in carbonates

Conference · Wed Jan 01 04:00:00 EST 1986

OSTI ID:6975317

Smits, R M.M.; de Waal, A; van Kooten, J F.C.

A new procedure has been developed to predict the abrupt in-situ compaction and the associated surface subsidence above high-porosity carbonate fields showing pore collapse. The approach is based on an extensive laboratory compaction study in which the effects of carbonate type, porosity, core preparation, pore saturant, horizontal to vertical stress ratio and loading rate on the pore collapse behaviour were investigated. For each carbonate type a trendline was established describing the relationship between the porosity after collapse and the vertical effective stress. This trendline concept, in combination with existing subsidence models, enables reservoir compaction and surface subsidence to be predicted on the basis of wireline porosity logs. Static and dynamic elastic constants were found to be uncorrelated during pore collapse. The position of the trendline depends strongly on carbonate type, pore saturant, loading rate and stress ratio. Therefore procedures are given to derive the correct in-situ trendline from laboratory compaction experiments.

• Research Organization: Koninklijke/Shell EandP Laboratorium
• OSTI ID: 6975317
• Report Number(s): CONF-861080-
• 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
BENCH-SCALE EXPERIMENTS
CARBONATE ROCKS
COMPACTING
CRYSTAL STRUCTURE
DRILL CORES
ELASTICITY
EXPERIMENT PLANNING
GEOLOGIC DEPOSITS
GEOLOGIC MODELS
GROUND SUBSIDENCE
MECHANICAL PROPERTIES
MECHANICS
MICROSTRUCTURE
MINERAL RESOURCES
NATURAL GAS DEPOSITS
PETROLEUM DEPOSITS
PLANNING
POROSITY
RESERVOIR ROCK
RESOURCES
ROCK MECHANICS
ROCKS
SATURATION
SEDIMENTARY ROCKS
STRESS ANALYSIS
TENSILE PROPERTIES
WELL LOGGING