Method for improving the accuracy of nmr relaxation...

Details Method for improving the accuracy of nmr relaxation... Method for improving the accuracy of nmr relaxation...

G - Physics

01

R

G01R 33/44 (2006.01) G01N 15/08 (2006.01) G01N 24/08 (2006.01) G01R 35/00 (2006.01) G01V 3/32 (2006.01)

Patent

CA 2256101

The total porosity is calculated by summing over the effective porosity and the CBW porosity. With the correction described in this patent, an overcall of the total porosity from some part of the clay bound water signal being counted twice is avoided. The effect will be more significant in shaley sand where CBW porosity is abundant. The correct T2 distribution is essential to BVI and SBVI estimation. The same data correction concept can be applied to make a meaningful comparison of logs or laboratory core NMR data that are obtained with different sampling periods TE.

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