Seismic lateral prediction in chalky limestone reservoirs offshore Qatar
Following the discovery of non-structurally trapped oil accumulations in Cretaceous chalky reservoirs on the northern flank of the North Dome offshore QATAR, a seismic lateral prediction study was carried out for QATAR GENERAL PETROLEUM CORPORATION (Offshore Operations). The objectives of this study were to assist in the appraisal of these oil accumulations by predicting their possible lateral extent and to investigate if the technique applied could be used as a basis for further exploration of similar oil prospects in the area. Wireline logs of eight wells and some 1000 km of high quality seismic data were processed into acoustic impedance (A.I.) logs and seismic A.I. sections. Having obtained a satisfactory match of the A.I. well logs and the A.I. of the seismic traces at the well locations, relationships were established by the use of well log data which allowed the interpretation of the seismic A.I. in terms of reservoir quality. Measurements of the relevant A.I. characteristics were then carried out by computer along all seismic lines and porosity distribution maps prepared for some of the reservoirs. These maps, combined with detailed seismic depth contour maps at reservoir tops, lead to definition of good reservoir development areas downdip from poor reservoir quality zones i.e. of the stratigraphic trap areas, and drilling locations could thus be proposed. The system remains to be adequately calibrated when core material becomes available in the area of study.
- Research Organization:
- Shell Internationale Petroleum Mij, (SIPM)
- OSTI ID:
- 5572387
- Report Number(s):
- CONF-830397-
- Journal Information:
- Soc. Pet. Eng. AIME, Pap.; (United States), Vol. SPE 11451; Conference: 3. Middle East oil exibition, Manama, Bahrain, 14 Mar 1983
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
58 GEOSCIENCES
PETROLEUM DEPOSITS
SEISMIC SURVEYS
QATAR
GEOLOGIC FORMATIONS
COMPUTER CALCULATIONS
CRETACEOUS PERIOD
DRILL CORES
EXPLORATION
FORECASTING
GEOLOGIC TRAPS
LIMESTONE
MAPS
MEASURING METHODS
OFFSHORE SITES
RESERVOIR ROCK
STRATIGRAPHY
WELL DRILLING
WELL LOGGING
ASIA
CARBONATE ROCKS
DRILLING
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGY
GEOPHYSICAL SURVEYS
MESOZOIC ERA
MIDDLE EAST
MINERAL RESOURCES
RESOURCES
ROCKS
SEDIMENTARY ROCKS
SURVEYS
020200* - Petroleum- Reserves
Geology
& Exploration
580203 - Geophysics- Geophysical Survey Methods- (1980-1989)