Search USGS⌕ Search

Geology topics

Dallas B. Jackson

Publications and source records attributed to Dallas B. Jackson.

At least 19 recordsLinked to original sources
USGS1976

Schlumberger soundings in the Las Cruces, New Mexico area

In 1973 the U.S. Geological Survey contracted for 50 symmetric Schlumberger soundings from Geoterrex Ltd. to be run in the Las Cruces, New Mexico area to aid in hydrologic studies. During 1974 and 1975 the U.S. Geological Survey added 100 additional symmetric Schlumberger soundings to increase the areal coverage of the 1973 survey. Measurements made by Geoterrex are so labeled on the sounding curve graphs. Soundings made by the U.S. Geological Survey are denoted by a letter and a number. Figure 1 shows the index map for the location, number, and azimuth of the sounding station. The maximum electrode spacing ranged from AB/2 = 25 m (82 ft) to AB/2 - 4,877 m (16,000 ft). All the sounding curves were automatically processed and interpreted as shown in the graphs given in the appendix.

New Mexico↗
USGS1975

Description of the geoelectric section, Rattlesnake Hills unit 1 well, Washington

A complex 64-in. normal log from the 3,249-m-deep Rattlesnake Hills well was digitized and reduced to a form resembling a simple resistance log. The simplified form of the log made it possible to recognize three major geoelectric intervals in the well that were not apparent on the original log. The apparent resistivity values from each geoelectric interval are grouped into a frequency-distribution table, where midpoints of the class interval are corrected for the effects of hole diameter and mud resistivity. Using corrected class-interval midpoint resistivities, first-approximation values are calculated for five geoelectric parameters: total transverse resistance, total longitudinal conductance, average longitudinal resistivity, average transverse resistivity, and the coefficient of anisotropy. Comparison of anisotropies, resistivity variations, and resistivity-frequency polygon shapes indicates quantitative differences among the three geoelectric intervals.

Washington↗