Date of Award

Fall 12-1986

Document Type


Degree Name

Master of Science (MS)


Ocean & Earth Sciences



Committee Director

Carl F. Koch

Committee Member

R. S. Spencer

Committee Member

Joseph Rule

Call Number for Print

Special Collections LD4331.G4C76


A new method of detecting fractures using well logs is presented. The technique uses discriminant analysis to distinguish fractured from unfractured reservoir rock and was developed for the volcanic pay zone of Jatibarang oilfield, West Java, Indonesia.

The a priori information required to derive the discriminant function was provided by 22 wells known to penetrate intervals of either fractured or unfractured volcanics. The samples consisted of these 22 intervals digitized in one-meter increments (1256 meters total thickness). The discriminating variables were the petrophysical measurements made by 10 different types of well logs.

Discriminant analysis correctly classified 94.2% of the total volcanic interval as fractured or unfractured.

The resultant discriminant function can be applied during log analysis at the wellsite and aids in decisions regarding well testing and completion. The new technique can readily be extended to other fractured reservoirs


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