Lithology determination from the calcium and magnesium activatio

Details Lithology determination from the calcium and magnesium activatio Lithology determination from the calcium and magnesium activatio

1978-12-26

1980-06-17

Willis, Davis L.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250270, G01V 500

Patent

active

042085802

ABSTRACT:
In the illustrative embodiments of the invention disclosed, the lithology of an earth formation traversed by a well bore is investigated by irradiating the formation with a neutron source and generating an energy spectrum of the activation gamma rays resulting therefrom. From the spectrum thus obtained, the levels of the activation gamma radiation emitted by .sup.27 Mg and that emitted by .sup.49 Ca are determined. The two intensity measurements are then combined, e.g. by forming a cross-plot or ratio thereof, to provide an indication of the lithology of the earth formation and, in particular, of the extent of dolomitization of the formation.

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patent: 3257557 (1966-06-01), Youmans
patent: 3566117 (1971-02-01), Tixier
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patent: 3943362 (1976-03-01), Peelman
patent: 4020342 (1977-04-01), Smith, Jr. et al.
patent: 4055763 (1977-10-01), Antkiw
"Log Analysis in Formations with Complex Technologies", Journal of Petroleum Technology, Aug. 1971, pp. 995-1005.

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