Reservoir Feasibility and Expansion Project
COLOG collected high resolution borehole imaging data using Optical and Acoustic Televiewer probes in twenty-five boreholes. These images, oriented for tilt and azimuth, were utilized to determine the depth and direction of major and minor fractures. Fractures were...
Colorado Interstate Expansion
Colog collected optical and acoustic televiewer data at five locations on top of a mountain near Idaho Springs, CO, off westbound I-70. Plans are to widen the interstate from two lanes to three to accommodate additional westbound travelers. I-70 will be reconfigured...
Proprietary Technology Utilized At Lake Mead
Acoustic Televiewer (ABI) logging was performed in three horizontal boreholes in the underground shaft at Lake Mead National Park, Boulder City, NV. Because the boreholes were ejecting water between 150 to 450 GPM, the ABI was deployed utilizing a proprietary...
Shallow Sea Bed Geotechnical Logging
COLOG acquired a tailored suite of geophysical logs, including nuclear logging and P-S Suspension logging, from a jack-up barge 20 miles off the coast of Maryland. The geotechnical investigation modeled the rock-strength properties of soft sea floor sediment providing...
Tanzania Clay-Typing and Lithologic Study
Colog conducted natural and spectral gamma logging, EM induction conductivity and magnetic susceptibility logging using portable equipment at four corehole sites in the Ngorongoro Crater in Tanzania. Our lithologic analysis of the downhole geophysical data were...
Dewatering Study Near Leadville, CO
A project involving hydrophysical logging (HpL) under ambient and pumping conditions was used to evaluate the vertical distribution of hydraulic conductivity in a mine borehole. The corehole was in a strategic location on site: drilled into a fault intersecting two separate geologic units assumed to be of significantly different heads. The expected yield of the corehole […]
Sensitive Environmental Study for Remediation Planning
Multiple logging measurements were needed to design optimal remediation plans at an environmentally sensitive site. A study performed for two different clients at this southern CA location involved Optical Televiewer and Acoustic Televiewer, along with EM Induction Conductivity, Fluid Temperature and Fluid Conductivity, 3-Arm Caliper, Electric Resistivity logging, Downhole Video and Corehole Dynamic Flowmeter for fracture-specific flow, […]
Sonar Applications in Submerged Mine Workings
COLOG has adapted a multi-frequency profiling sonar probe that can be logged from any 4-conductor standard geophysical logging rig, for imaging submerged mine workings, large diameter shafts, raised bores, karst environments and large diameter boreholes. Much of the data collected from this new technology has been on high-profile projects – environmental studies at mine sites […]
Rio Grande River Basin Horizontal Groundwater Characterization
COLOG was hired to characterize the horizontal movement of groundwater through the Rio Grande River Basin . This project proved challenging due to the complex hydrogeology and lack of historical geologic data from past drilling programs. In the Rio Grande Basin, many wells flow artesian at hundreds, to sometimes thousands of gallons per minute. Other wells show […]
Municipal Water Supply Well for Tucson, AZ
One of the more common applications of geophysical logging for COLOG’s Arizona office is “The Water Well Suite”.
Great Lakes Hydrophysics and Crosshole Packer Testing
A Great Lakes region project included Hydrophysical Logging (HpL), Wireline Straddle-Packer (WSP) testing, optical televiewer and Corehole Dynamic Flowmeter (CDFM) in angled and vertical coreholes up to 3,000 feet deep. Tools were all run from a standard geophysical rig. Televiewer and flow-logging were performed to evaluate the vertical distribution of permeability in the coreholes and […]
Comprehensive Geophysical Logging Suite
Comprehensive Geophysical Logging Suite Including Sonic, Resistivities/Gamma, Dual Neutron, Compensated Density and Caliper for Lithologic Analysis in Shallow Sea Bed Block Island Wind Farm of the Coast of Rhode Island. COLOG performed an extensive geophysical logging suite from a jack-up barge 20 miles off the coast of Rhode Island in support of a geotechnical investigation […]
Hydrophysical Logging with Discrete-Point Groundwater Sampling
Hydrophysical Logging with Discrete-Point Groundwater Sampling and Packer Testing to Identify Nitrate Concentrations in a Municipal Production Water Well A Comparison of Techniques, Rancho Cucamonga, CA COLOG conducted Hydrophysical logging combined with downhole discrete-point groundwater sampling to characterize the vertical distribution of flow and nitrate concentrations in a municipal water supply well. Following the hydrophysical […]
Borehole Geophysics for CUP-McCook Reservoir Investigation
Borehole Geophysics for CUP-McCook Reservoir Investigation COLOG acquired a full suite of geophysical logs including acoustic televiewer, density, full waveform sonic and resistivities. COLOG generated a fully integrated report which included lithologic sections and analysis, engineering properties, porosity log calculations and analysis, 3-dimensional televiewer images, permeability logs (analysis and packer interval selection), and synthetic seismograms. […]
Optical Televiewer Logging for the US Army Corps of Engineers
Optical Televiewer (OBI) Logging for the US Army Corps of Engineers Haysi, VA COLOG logged several borings for the USACE in association with a proposed dam site for structural integrity and fracture analysis. The OBI logging was conducted as an alternative to acoustic televiewer logging due to its application in air and fluid filled borings. […]
Hydrophysical Cross-Hole Testing on a Semi-Dry Lakebed
Hydrophysical Cross-Hole Testing on a Semi-Dry Lakebed Support of a Feasability Study, Utah COLOG conducted Hydrophysical Logging under ambient, stressed and cross-hole conditions to evaluate the horizontal and vertical hydraulic conductivity of a lakebed as well as the extent of vertical hydraulic communication through a quasi-confining layer. COLOG conducted the testing in 22 wellbores constructed […]
Hydrophysical Logging, Optical Televiewer, and Wireline Straddle-Packer Testing
Hydrophysical Logging, Optical Televiewer (OBI) and Wireline Straddle-Packer Testing Underground Mine, Elko, Nevada COLOG conducted a full Hydrophysical Logging (HpL), optical televiewer logging and wireline Straddle-Packer (WSP) program in 14 HQ and NQ-sized coreholes for fracture-flow evaluation in support of a dewatering study. The logging program was performed with both truck-mounted equipment and portable equipment […]
Drill Shaft Integrity Studied
Comprehensive Geophysical Logging Including: Cross-Hole Sonic Logging (CSL), 3-D MULTI-OFFSET Tomography (CSLT), and Gamma-Gamma Density Logging (GDL) Case Foundation/AZDOT, Tucson, AZ COLOG performed CSL and GDL to evaluate the integrity of 4-foot and 6-foot diameter, 88-foot length drill shaft foundations. When defects were identified, 3D cross-hole sonic logging tomography (CSLT) was used to volumetrically define […]
Hydrophysical Logging and Full Suite of Geophysical Logging
Hydrophysical Logging, Optical Televiewer, Density, Neutron and a Full Suite of Geophysical Logging Along With Wireline Straddle-Packer Testing for Fracture Evaluation and Flow Characterization Redstone Arsenal, Huntsville, AL COLOG has been part of a long-term, comprehensive geophysical and hydrophysical logging program designed to deliniate the preferential flow-pathways in a fractured limestone at Redstone Arsenal in […]
Acoustic and Optical Televiewer Imaging and Geophysical Evaluation
Acoustic and Optical Televiewer Imaging and Geophysical Evaluation in Coreholes for the US Bureau of Reclamation Denver, CO COLOG was contracted to collect high resolution borehole image data for fracture evaluations in support of site-specific structural and maintenence programs. COLOG generated a comprehensive report for each of the sites involved: » Folsom Dam, CA » […]