J. Ocean Eng. Technol. Search


J. Ocean Eng. Technol. 1988;2(2):51-60.    

Automatic Interpretation of the Borehole Normal Resistivity Data by Using a Personal Computer
Kim Jin-Hu
퍼스널 컴퓨터를 이용한 비저항 물리검층자료의 자동해석
동아대학교 해양공학과
Copyright © 1988 The Korean Society of Ocean Engineers     Open access / Under a Creative Commons License
Key Words: Borehole, Normal Resistivity Data, Point-electrode Focusing Method, Approximate Apparent Resistivity, Bed Boundary Coefficient, Automatic Interpretation
핵심용어: 시추공, 노멀 비저항검층자료, 전류지향법, 근사비저항, 지층경계계수, 자동해석
A data transform is performed by using a point-electrode focusing method in order to obtain accurate and objective interpretation of the borehole normal resistivity data. Two new synthetic curves can be generated through the data transform. The one is an approximate apparent resistivity curve, which would be used to predict the true resistivity of the formation. The other one is a bed boundary coefficient curve, which would be used to distinguish bed boundaries. The accuracy of the normal data interpretation can be improved and this method takes much less computational time than a linear inversion technique. Moreover, this method does not require an initial guess model and limitation of number of unknown parameters. Since this algorithm can be run on a personal computer, an immediate interpretation would be possible at the field work site. If an additional set of electrodes(a=125cm)is attached to a normal resistivity tool which is being used (a=25cm, 50cm, 100cm), the apparent resistivity for the point-electrode focusing device can be calculated, and it would maximize the use of short and long normal resistivity data and promote the accuracy of the interpretation.
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