In cooperation with the U.S. Army, Camp Stanley Storage Facility
Induction Conductivity and Natural Gamma Logs Collected in 15 Wells at Camp Stanley Storage Activity, Bexar County, Texas
By Gregory P. Stanton
U.S. Geological Survey
Data Series 132
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appendix 1 and 2, pdf (279 KB, contains some pages 8 1/2" X 14")
appendix 3, cd files (22.8 MB)
Contents
Abstract
Introduction
Purpose and Scope
Description of Study Area
Acknowledgments
Methodology
Induction and Natural Gamma Logs
Summary
References
Appendix 1— Induction Calibration Information
Appendix 2— Borehole Geophysical Logs
Appendix 3—Logging Data Collected March 28–30, 2005 (compact disc)
Figure
| 1. | Map showing location of Camp Stanley Storage Activity and immediately adjacent area, Bexar County, Texas, with locations of wells logged |
Table
| 1. | Well completion information for wells logged during March 28–30, 2005 |
Abstract
The U.S. Geological Survey, in cooperation with the Camp Stanley Storage Activity conducted electromagnetic induction conductivity and natural gamma logging of 15 selected wells on the Camp Stanley Storage Activity, located in northern Bexar County, Texas, during March 28–30, 2005. In late 2004, a helicopter electromagnetic survey was flown of the Camp Stanley Storage Activity as part of a U.S. Geological Survey project to better define subsurface geologic units, the structure, and the catchment area of the Trinity aquifer. The electromagnetic induction conductivity and natural gamma log data in this report were collected to constrain the calculation of resistivity depth sections and to provide subsurface controls for interpretation of the helicopter electromagnetic data collected for the Camp Stanley Storage Activity.
Logs were recorded digitally while moving the probe in an upward direction to maintain proper depth control. Logging speed was no greater than 30 feet per minute. During logging, a repeat section of at least 100 feet was recorded to check repeatability of log responses.
Several of the wells logged were completed with polyvinyl chloride casing that
can be penetrated by electromagnetic induction fields and allows conductivity
measurement. However, some wells were constructed with steel centralizers and
stainless steel screen that caused spikes on both conductivity and resulting
resistivity log curves. These responses are easily recognizable and appear at
regular intervals on several logs.
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