How to read a well log_Hughbert Collier

1. Hughbert Collier, Ph.D., P.G.
Senior Vice President
Stephenville, TX (254) 396-0446

4. Sandstone Aquifer

7. 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

9. Sandstone Aquifer

11. 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

12. Formation properties
• Depth
• Thickness
• Mineralogy
• Porosity
• Water quality (relative salinity)
• Radioactivity
• Temperature
• Bulk density
open or nonmetallic casing

13. • Hydraulic conductivity
• Fractures
• Depositional facies
• Moisture content in the vadose zone
• Confining beds

14. Borehole Characteristics
• Diameter (including washouts and constrictions)
• Volume
• Static water level
• Fluid flow (direction and velocity)

15. Stratigraphy
• Extent of aquifers and confining beds
• Depositional facies

16. • Design well test
• Place Screen
• Complete wells
• Evaluate well completions
• Design well remediation

17. • Water Content
• Porosity
• Water saturation
• Water Chemistry
• Salinity
• Composition
• Lithology
• Temperature

19. • Trinity Well
• North Texas
• How Deep to Screen?

20. 700
1,000
3,000
10,000
20,000
500’
1,000’
1,500’
2,000’

25. www.collierconsul,ng.com
(254) 968-8741