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Bob Hardage's talk on wavefield seismic stratigraphy.
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Bureau of Economic Geology Centennial Lecture Program
MULTICOMPONENTSEISMIC STRATIGRAPHY
Dr. Bob A. Hardage
• First organized research unit of The University of Texas at
Austin
• State Geological Survey of Texas
• One of three units of the Jackson School of Geosciences
• Staff—140, which includes 80 researchers
Bureau of Economic Geology
Bureau of Economic Geology
Bureau of Economic Geology
• Fossil energy• Environment• Outreach• Advising state and federal
government• Maintaining collections for
research:– Cores: 3 repositories, 1,500 miles of core– Electric logs: 1,000,000 logs in archive
Full-Time Research Mission
Bureau of Economic Geology
Bureau Facilities in Austin, Texas
SEISMIC STRATIGRAPHYSEISMIC STRATIGRAPHY
“a method of seismic interpretation based onrecognizing seismic sequences and seismicfacies and using the spatial geometries,arrangements, and distributions of thesesequences and facies to infer depositionalenvironments and lithofacies patterns.”
Bureau of Economic Geology
ELASTIC WAVEFIELDSTRATIGRAPHY
“a method of seismic interpretation based onthe concept that any mode of a seismic wavefieldmay provide unique seismic sequence informationand/or unique facies information across somestratigraphic intervals that cannot be observedwith other modes of the wavefield.”
ELASTIC WAVEFIELDSTRATIGRAPHY
Bureau of Economic Geology
CHRONOSTRATIGRAPHICSURFACE
“a depositional surface where geologic time is afixed, constant value at every coordinate on thesurface. Synonymous with stratal surface andbedding plane.”
CHRONOSTRATIGRAPHICSURFACE
Bureau of Economic Geology
LITHOSTRATIGRAPHICSURFACE
“a depositional surface that has a constantrock type at every surface coordinate.”
LITHOSTRATIGRAPHICSURFACE
Bureau of Economic Geology
DEPOSITIONAL SEQUENCE
“a stratigraphic unit composed of a relativelyconformable succession of genetically relatedstrata and bounded at its top and base by unconformities or their correlative conformities.”
DEPOSITIONAL SEQUENCE
Bureau of Economic Geology
SEISMIC SEQUENCE
“a succession of relatively conformable seismicreflections bounded by unconformable reflectionsor their correlative conformable reflections.”
SEISMIC SEQUENCE
Bureau of Economic Geology
INTERPRETED SEISMIC SEQUENCES
FACIES
“a unique aspect or recognizableproperty of an object.”
FACIES
Bureau of Economic Geology
SEISMIC FACIES UNITS
“groups of seismic reflections whoseparameters (configuration, amplitude,continuity, frequency, and intervalvelocity) differ from adjacent groups.”
SEISMIC FACIES UNITS
Bureau of Economic Geology
- CRITICAL REQUIREMENT –
Depth registration of P and S data.
- CRITICAL REQUIREMENT –
Depth registration of P and S data.
Bureau of Economic Geology
USING THIN-BED STRATIGRAPHY TO DEPTH REGISTER P-P AND P-SV DATA
A A
B
B
CASE HISTORIESCASE HISTORIES
Bureau of Economic Geology
COMPARISON OF LOG ANDSEISMIC FRACTURE ORIENTATIONS
COMPARISON OF LOG ANDSEISMIC FRACTURE ORIENTATIONS
SHELF B - NORTH
CLAY CONTENT EARTH MODEL
EFFECT OF CLAY CONTENT ON REFLECTIVITY(Sand = 4%)
ALBA WELL LOGS, NORTH SEA
MacLeod and others (1999)Duranti and others (2000)
ALBA REFLECTIVITY: CLASS 2 RESERVOIR
ALBA FIELD, NORTH SEA
PP AND PS REFLECTIVITIES: BRINE VSGAS-CHARGED SEDIMENTS
ELASTIC WAVEFIELDSTRATIGRAPHY
“a method of seismic interpretation based onthe concept that any mode of a seismic wavefieldmay provide unique seismic sequence informationand/or unique facies information across somestratigraphic intervals that cannot be observedwith other modes of the wavefield.”
ELASTIC WAVEFIELDSTRATIGRAPHY
Bureau of Economic Geology
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