how to read a well log_hughbert collier
TRANSCRIPT
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Hughbert Collier, Ph.D., P.G. Senior Vice President
Stephenville, TX (254) 396-0446
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SandstoneAquifer
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Wireline logging is often the best method of imaging the subsurface because: • Immediately available at the wellsite • A continuous record of the borehole • Repeatable • Synergistic
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SandstoneAquifer
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Borehole geophysical logs provide a wide range of information for groundwater/environmental studies: • Identifying/ characterize aquifers and aquitards • Identifying contaminant plumes • Identifying fluid movement • Ground-truth surface geophysical studies
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Formation properties • Depth • Thickness • Mineralogy • Porosity • Water quality (relative salinity) • Radioactivity • Temperature • Bulk density
open or nonmetallic casing
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• Hydraulic conductivity • Fractures • Depositional facies • Moisture content in the vadose zone • Confining beds
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Borehole Characteristics • Diameter (including washouts and constrictions) • Volume • Static water level • Fluid flow (direction and velocity)
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Stratigraphy • Extent of aquifers and confining beds • Depositional facies
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• Design well test • Place Screen • Complete wells
• Evaluate well completions • Design well remediation
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• Water Content • Porosity • Water saturation
• Water Chemistry • Salinity • Composition
• Lithology • Temperature
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• TrinityWell• NorthTexas• HowDeeptoScreen?
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700
1,000
3,000
10,00020,000
500’
1,000’
1,500’
2,000’
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www.collierconsul,ng.com(254)968-8741