Permeability determinations through the logging of subsurface fo

Details Permeability determinations through the logging of subsurface fo Permeability determinations through the logging of subsurface fo

1986-08-18

1988-09-27

Myracle, Jerry W.

Measuring and testing

Borehole or drilling

Downhole test

364422, E21B 4900

Patent

active

047732644

ABSTRACT:
Methods for determining the permeability of an earth formation traversed by a borehole are provided and comprise: logging the borehole to determine indications of at least a plurality of elements in the formation; determining the mineralogical content of the formation from the elemental indications; determining the porosity of the formation; and determining the permeability of the formation as a function of the determined mineralogical content and porosity. The mineralogical content of the formation is preferably determined according to a transform which relates elemental concentrations of the formation to mineral weight percentages. The permeability is preferably determined according to a transform which equates the permeability to a product of the function of the formation porosity, the maximum feldspar content in a given zone of the formation, and an exponential function of the summation of pedetermined mineral components of the formation and residual weighted by a redetermined constant for each mineral component and the residual. If desired, the element to mineral transform can be combined with the formation mineral and porosity to permeability transform, thereby eliminating the step of determining the mineralogical content via the element-mineral transform.

REFERENCES:
patent: 4475038 (1984-10-01), Lochmann et al.
patent: 4495604 (1985-01-01), Dumanoir
patent: 4594887 (1986-06-01), Fertl et al.
A. Timur, An Investigation . . . Sandstone Resevoirs, The Log Analyst, Jul.-Aug. 1968.

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