G - Physics – 01 – V
Patent
G - Physics
01
V
324/11, 354/21
G01V 3/38 (2006.01) E21B 47/00 (2006.01) E21B 49/00 (2006.01) G01V 3/20 (2006.01)
Patent
CA 1264087
ABSTRACT OF THE DISCLOSURE METHOD OF INTERPRETING IMPEDANCE DISTRIBUTION OF AN EARTH FORMATION OBTAINED BY A MOVING ARRAY USING END EMITTING CURRENT ELECTRODES SEQUENTIALLY ACTIVATED AND A SERIES OF POTENTIAL ELECTRODES In accordance with the present invention, a method is disclosed for synthesizing the true response characteris- tics of a combination of different hole-centered electric logging tools in a variety of difficult borehole conditions as provided by (1) determining impedance values of an earth for- mation penetrated by a borehole filled with a drilling mud of resistivity (Rm), and (2) selectively manipulating the impe- dance values as impedance entries of a matrix so as to syn- thesize operations of different hole-centered tools over an associated depth increment with surprising accuracy. Each of the impedance matrices is associated with a matrix gather indexed to one of a series of finite, overlapping depth scan increments of the formation measured along the borehole. Each scan increment is dependent on the array length L of the elec- trode array to define shallow and deep depth markers as well as being centrally indexed to the depth in the borehole of a mid-central electrode assembly of the array at the time of data collection. The original data is provided by a moving logging array having end emitting current electrodes sequen- tially activated and a series of potential electrodes.
514993
Angehrn Jorg A.
Chapman Carroll W.
Angehrn Jorg A.
Chapman Carroll W.
Chevron Research And Technology Company
Sim & Mcburney
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