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The AAPG/Datapages Combined Publications Database

AAPG Special Volumes

Abstract


Pub. Id: A179 (1986)

First Page: 241

Last Page: 256

Book Title: SG 22: A Basin Analysis Case Study: Morrison Formation, Grants Uranium Region, New Mexico

Article/Chapter: Analysis of Geophysical Well Logs from the Mariano Lake-Lake Valley Drilling Project, San Juan Basin, Northwestern New Mexico

Subject Group: Energy Minerals, Etc.

Spec. Pub. Type: Studies in Geology

Pub. Year: 1986

Author(s): James H. Scott

Abstract:

Geophysical well logs were obtained in eight deep holes drilled and cored by the U.S. Geological Survey to examine the geology of the Mariano Lake-Lake Valley area in the southern part of the San Juan basin, New Mexico. The logs were made to determine the petrophysical properties of the rocks penetrated by the holes, to aid in making stratigraphic correlations between the holes, and to estimate the grade of uranium enrichment in mineralized zones. The logs can be divided into six categories--nuclear, electric, sonic, Previous HitmagneticNext Hit, dipmeter, and borehole conditions. Examples of these logs are presented and related to lithological and petrophysical properties of the cores recovered. Gamma-ray and prompt fission neutron logs were used to estimate uranium grade in mineralized zon s. Resistivity and spontaneous potential logs were used to make stratigraphic correlations between drill holes and to determine the variability of the sandstone: mudstone ratios of the major sedimentary units. In one drill hole a dipmeter log was used to estimate the direction of sediment transport of the fluvial host rock. Previous HitMagneticNext Hit susceptibility logs provided supportive information for a laboratory study of Previous HitmagneticTop mineral alteration in drill cores. This study was used to infer the geochemical and hydrologic environment associated with uranium deposition in the project area.

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