Method of delineating naturally fractured intervals in subterran

Details Method of delineating naturally fractured intervals in subterran Method of delineating naturally fractured intervals in subterran

1992-01-21

1993-07-06

Fields, Carolyn E.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250259, G01V 504

Patent

active

052256740

ABSTRACT:
A potassium salt which is soluble either in water or in an oil-based drilling mud is forced via filtrate invasion into permeable subsurface formation zones adjacent a well borehole via an over-balanced drilling mud or completion system. Well logging is then performed in an interval of interest in the formations using natural gamma ray spectrometry. Gamma radiation at an energy of 1.46 MeV from the naturally occurring radioactive potassium isotope .sup.40 K is detected. Gamma radiation levels of the isotope .sup.40 K above normal background readings indicate the presence of permeable formations.

REFERENCES:
patent: 3129331 (1964-04-01), Bourne, Jr. et al.
patent: 4178506 (1979-12-01), Fertl
patent: 4939361 (1990-07-01), Smith, Jr.

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