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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 65 (1981)

Issue: 1. (January)

First Page: 154

Last Page: 159

Title: Modes of Formation of Anomalously High Radioactivity in Oil-Field Brines: GEOLOGIC NOTES

Author(s): Salman Bloch (2), Robert M. Key (3)


Many oil-field brines contain anomalously high radium concentrations. A theoretical model proposed here suggests that such concentrations can be a function of the geochemical environments of petroleum reservoirs or can be caused by uranium occurrences associated with oil pools. The model suggests that, on a triangular diagram with barium, radium-228, and radium-226 as the axes, brines associated with uranium occurrences will plot relatively far toward the radium-226 corner. Radium-rich brines associated with "normal" mineral assemblages will fall relatively close to the Ba/Ra-228 side of the diagram. Geochemical differentiation of the radium source may provide a useful tool in exploration for uranium accumulations in petroliferous areas.

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