Available from the U.S. Geological Survey, Branch of Information Services, Box 25286, Denver Federal Center, Denver, CO 80225, USGS Open-File Report 02-364, 39 p., 10 figs.
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This report presents and describes geophysical logs for six boreholes in Lariat Gulch, a topographic gulch at the former U.S. Air Force site PJKS in Jefferson County near Denver, Colorado. Geophysical logs include gamma, normal resistivity, fluid-column temperature and resistivity, caliper, televiewer, and heat-pulse flowmeter. These logs were run in two boreholes penetrating only the Fountain Formation of Pennsylvanian and Permian age (logged to depths of about 65 and 570 feet) and in four boreholes (logged to depths of about 342 to 742 feet) penetrating mostly the Fountain Formation and terminating in Precambrian crystalline rock, which underlies the Fountain Formation. Data from the logs were used to identify fractures and bedding planes and to locate the contact between the two formations. The logs indicated few fractures in the boreholes and gave no indication of higher transmissivity in the contact zone between the two formations. Transmissivities for all fractures in each borehole were estimated to be less than 2 feet squared per day.
Abstract
Introduction
Background on Geophysical Logs
Natural Gamma
Normal Resistivity
Fluid Column
Acoustic Televiewer
Caliper
Heat-Pulse Flowmeter
Quality Control
Analysis
Lithology
Structure
Heat-Pulse Flowmeter
Flowmeter-Measurement Adjustments and Normalization
Interpretation of Lariat Gulch Logs
Borehole LGMW-001-P
Borehole LGMW-003-P
Borehole LGMW-004-F
Borehole LGMW-006-P
Borehole LGMW-010-F
Borehole LGMW-017-P
Overview of Lariat Gulch Logs
Summary and Conclusions
References Cited
Water Resources of Colorado
Contact: webmaster_co@usgs.gov
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