Method for in situ determination of the cation exchange capaciti

Details Method for in situ determination of the cation exchange capaciti Method for in situ determination of the cation exchange capaciti

1979-02-26

1981-04-21

Smith, Alfred E.

Radiant energy

Geological testing or irradiation

With sampling

73153, G01V 500, E21B 4902

Patent

active

042635098

ABSTRACT:
A method is disclosed for the in situ examination of each subsurface formation penetrated by a borehole to ascertain the cation exchange capacity of such formations within a geological region. Natural gamma ray logging is used to develop signals functionally related to the total gamma radiation and to the potassium -40, uranium and thorium energy-band radiations. A first borehole is traversed by a potential gamma ray spectrometer to provide selected measurements of natural gamma radiation. Core samples are taken from the logged formation and laboratory tests performed to determine the cation exchange capacity thereof. The cation exchange capacities thus are developed then correlated with selected parameters provided by the gamma ray spectrometer to establish functional relationships. Cation exchange capacities of formations in subsequent boreholes within the region are then determined in situ by use of the natural gamma ray spectrometer and these established relationships.

REFERENCES:
patent: 3711765 (1973-01-01), Overton
patent: 3770378 (1973-11-01), Russell
patent: 3940610 (1976-02-01), Dennis et al.
Rush and Jenkins, "New Method Finds Cation Exchange Capacity Quickly and Economically" published in The Oil and Gas Journal, May 15, 1978.

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