Carbonate permeability

Details Carbonate permeability Carbonate permeability

2005-10-25

2005-10-25

McElheny, Jr., Donald (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Earth science

C324S303000

Reexamination Certificate

active

06959246

ABSTRACT:
A modification to the Coates-Timur relationship to produce a more coherent relationship applicable to carbonate formations is disclosed. In this method, permeability may be determined using porosity and the ratio of bound fluid volume to (1—bound fluid volume). This method also allows for improved estimation of irreducible water saturation of a carbonate formation using the ratio of kcand (eφf+kc). Likewise, the bound fluid volume of a carbonate formation may be determined using the ratio of φkcand (eφf+kc). In these relationships, e, x, and f are constants according to the following relationships e=xc, f=bc+1, x is between 1 and 100 mD (preferably 10 mD).

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Coates, G. R. et al.The MRIL in Conoco 33-1—An Investigation of a New Magnetic Resonance Imaging Log.Trans. SPWLA 32nd Ann. Log. Symp., New Orleans, LA, Paper DD (1991).
Timur, A.Producible Porosity and Permeability of Sandstones Investigated Through Nuclear Magnetic Resonance Principles.The Log Analyst (Jan-Feb 1969), pp. 3-11.

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