sedimentary geology geos 240 – chapter 2 collecting the data part 2 – regional geophysical data...
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Multi-Channel Reflection Seismic Sound source: explosive, vibroseis Sound source: explosive, vibroseis Geophone arrays ~21 per group to enhance S/n Geophone arrays ~21 per group to enhance S/nTRANSCRIPT
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Sedimentary GeologySedimentary GeologyGeos 240 – Chapter 2Geos 240 – Chapter 2Collecting the DataCollecting the Data
Part 2 – Regional Geophysical Part 2 – Regional Geophysical DataData
Dr. Tark HamiltonDr. Tark HamiltonCamosun CollegeCamosun College
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Collecting the DataCollecting the Data Stratigraphic Sections from Surface Stratigraphic Sections from Surface
OutcropsOutcrops Petrophysical logging of boreholesPetrophysical logging of boreholes Well cuttings and coresWell cuttings and cores Regional Geophysics (Seismic, Gravity, Regional Geophysics (Seismic, Gravity,
Magnetics, Electro-Magnetics, Ground Magnetics, Electro-Magnetics, Ground Penetrating Radar)Penetrating Radar)
Labwork on sediments, rocks, fossils, fluidsLabwork on sediments, rocks, fossils, fluids Computer/Office: Mapping, Interpretation Computer/Office: Mapping, Interpretation
& Modelling& Modelling
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Multi-Channel Reflection Multi-Channel Reflection SeismicSeismic
Sound source: explosive, vibroseisSound source: explosive, vibroseis Geophone arrays ~21 per group to enhance S/nGeophone arrays ~21 per group to enhance S/n
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Vibroseis Crews: Source Vibroseis Crews: Source TrucksTrucks
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Seismic Sections need Seismic Sections need Well TiesWell Ties
Time Time Depth conversion & marker beds Depth conversion & marker beds
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Contrasts between Contrasts between Seismic FaciesSeismic Facies
Deep Marine Basin River Channels
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Seismic versus Log Seismic versus Log Scales!Scales!
Seismic = Regional, Logs = Local featuresSeismic = Regional, Logs = Local features
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Seismic Section NW Africa Seismic Section NW Africa (Morocco)(Morocco)
Rifting of Pangea ~205 Ma Triassic/Lower Jurassic through CretaceousRifting of Pangea ~205 Ma Triassic/Lower Jurassic through Cretaceous Drift phase Tertiary, draping of older inactive structuresDrift phase Tertiary, draping of older inactive structures
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3D-Seismic for detailed 3D-Seismic for detailed areasareas
Generate structure volumes, cross sections & Generate structure volumes, cross sections & subsurface mapssubsurface maps
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GPR – Ground GPR – Ground Penetrating RadarPenetrating Radar
Radar Frequency electromagnetic pulsesRadar Frequency electromagnetic pulses Reflect off of Water TableReflect off of Water Table Density contrasts, buried walls, graves, channels, vaults, Density contrasts, buried walls, graves, channels, vaults,
subways!subways!
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Core Strip Log & GPR Section: Core Strip Log & GPR Section: AlaskaAlaska
Nested channels, migrating barsNested channels, migrating bars Gas sands on North Slope, also for placers, aquifersGas sands on North Slope, also for placers, aquifers
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Offshore Rigs & DrillingOffshore Rigs & Drilling
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THIS COVERS MOST THIS COVERS MOST CONVENTIONAL CONVENTIONAL
SEDIMENTARY GEOLOGY SEDIMENTARY GEOLOGY FOR RESOURCE FOR RESOURCE EXPLORATIONEXPLORATION
Mining Exploration, Environmental, Mining Exploration, Environmental, Geotechnical, Aquifer, Academic & Geotechnical, Aquifer, Academic & Archeological studies all do similar things but Archeological studies all do similar things but with smaller tools, areas of interest and way with smaller tools, areas of interest and way smaller budgets!smaller budgets!