Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Patent
1998-05-14
2000-04-11
Patidar, Jay
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
With radiant energy or nonconductive-type transmitter
324323, G01V 310, G01V 318
Patent
active
060492090
ABSTRACT:
A method for enhancing the axial resolution of conductivity well log measurements of in earth formation zones radially distal from a wellbore. The method includes calculating differential axial resolution information present in measurements of the conductivity of a zone radially proximal to the wellbore by low pass filtering the proximal zone measurements so as to have the same axial resolution as the measurements of earth formations radially distal from the wellbore, and subtracting the low pass filtered measurements from the measurements of the proximal zone. The differential axial resolution information is projected to conductivity values which would obtain if the proximal zone conductivity were equal to the distal zone conductivity. The projection is calculated by determining a projection factor, which is related to a weighted average of a ratio of conductivity in the distal zone with respect to the conductivity in the proximal zone. The projected differential axial resolution information is then added to the conductivity measurements of the distal zone to obtain higher resolution measurements of conductivity in the radially distal zone.
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Beard David R.
Corley Bill Harold
Geldmacher Ingo M.
Xiao Jiaqi
Fagin Richard A.
Patidar Jay
Western Atlas International Inc.
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