Method of interpreting impedance distribution of a

专利名称：Method of interpreting impedance

distribution of an earth formation

penetrated by a borehole using precursordata provided by a moving logging arrayhaving a single continuously emitting currentelectrode and a multiplicity of potentialelectrodes

发明人：Carroll W. Chapman,Jorg A. Angehrn申请号：US06/761127申请日：19850731公开号：US04703279A公开日：19871027

摘要：The response characteristics of a combination of hole-centered electric loggingtools in a variety of borehole conditions can be obtained by means of impedance valuesas entries of a matrix resulting from measurements over a series of depth increments,utilizing an array of 2M-1 electrode assemblies of equal incremental spacing positionedon a rigid mandrel. While the array moves continuously along the borehole, current iscontinuously emitted from the centrally located current electrode allowing theimpedance matrix to be formed by the principle of linear superposition in terms ofvoltage and voltage difference measurements between adjacent electrodes. Theimpedance matrix is inverted and used to generate a set of tool responses, which whenproperly compared to a set of tool responses previously generated by computersimulation and addressable by sets of borehole parameters and calibration factors,

allows the corresponding borehole conditions to be deduced from the measured data.

申请人：CHEVRON RESEARCH COMPANY

代理人：S. R. LaPaglia,E. J. Keeling,H. D. Messner

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