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 1264086
ABSTRACT OF THE DISCLOSURE METHOD OF INTERPRETING IMPEDANCE DISTRIBUTION OF AN EARTH FORMATION PENETRATED BY A BOREHOLE USING PRECURSOR DATA PROVIDED BY A MOVING LOGGING ARRAY HAVING A SINGLE CONTINUOUSLY EMITTING CURRENT ELECTRODE AND A MULTIPLICITY OF POTENTIAL ELECTRODES In accordance with the present invention, a method is disclosed for synthesizing the true response characteristics of a combination of different hole-cen- tered electric logging tools in a variety of difficult borehole conditions as provided by (1) determining impe- dance values of an earth formation penetrated by a bore- hole filled with a drilling mud of resistivity (Rm), and (2) selectively manipulating the impedance values as impe- dance entries of a series of reciprocal matrices so as to synthesize operations of different hole-centered tools over an associated depth increment with surprising accu- racy. Each of the reciprocal impedance matrices is asso- ciated with a reciprocal matrix gather indexed to one of a series of finite, overlapping depth scan increments of the formation measured along the borehole. Each scan incre- ment is dependent on the array length L of the electrode 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 a single continuously emitting current electrode and a multiplicity of potential electrodes.
514992
Angehrn Jorg A.
Chapman Carroll W.
Angehrn Jorg A.
Chapman Carroll W.
Chevron Research And Technology Company
Sim & Mcburney
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