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Science 5 October 1990:
Vol. 250. no. 4977, pp. 82 - 87
DOI: 10.1126/science.250.4977.82
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Articles

Neutron and Gamma Ray Scattering Measurements for Subsurface Geochemistry

Darwin V. Ellis 1

1 Schlumberger-Doll Research, Ridgefield, CT 06877

Developed for the oil industry, well logging instrumentation based on electrical, acoustic, and nuclear measurements has been providing information about the localization and evaluation of hydrocarbon-bearing strata for petroleum geologists and engineers since 1927. This method of exploring properties of the earth's crust without taking physical samples is attracting a growing audience of geologists and geophysicists because of recent developments that permit nondestructive measurements of subsurface geochemistry. A combination of nuclear measurement techniques, which use gamma ray and neutron sources, can provide detailed information on rock composition of interest to both industry and academia.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)