Measuring and testing – Borehole or drilling – Downhole test
Patent
1983-09-19
1985-09-17
Myracle, Jerry W.
Measuring and testing
Borehole or drilling
Downhole test
364422, E21B 4700
Patent
active
045412758
ABSTRACT:
An improved method and apparatus for correlating logging curves particularly adapted to formation dip determination from wire line dip meter measurements. A plurality of data sets each having a corresponding formation resistivity logging curve associated therewith are generated from a borehole. An activity transform function is derived from each data set, the maxima above a predetermined noise level of which are utilized to determine a set of possible points on the respective logging curve for correlation with points on another such curve. The set of points is reduced in size according to criteria requiring all possible correlated point-pairs to be separated in depth by no more than a predetermined maximum search interval, and on respective curve segments having the same slope sign and shape, wherein the shape criterion is a function of the activity. Final optimally correlated point-to-point matches or point-pairs are then selected through dynamic programming optimization using a spring loaded template matching approach.
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"An Analytical Approach to Detailed Determination Using Frequency Analysis", M. G. Kerzner, 23rd Annual SPWLA Logging Symposium, Paper J, 7/1982.
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Byron Richard M.
Dresser Industries Inc.
McCollum Patrick H.
Myracle Jerry W.
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