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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 70 (1986)

Issue: 9. (September)

First Page: 1129

Last Page: 1135

Title: Bit-Generated Rock Textures and Their Effect on Evaluation of Lithology, Porosity, and Shows in Drill-Cutting Samples

Author(s): William Graves (2)


During the drilling phase, drill cuttings provide critical data on which costly operational decisions are made. The success or failure of a well may depend on the accuracy of the interpretation of drill-cutting samples comprised of rock fragments 2 mm or less in diameter. These fragments commonly have bit-generated textures that differ substantially from those of the in-situ rocks. Under certain conditions, the bit may pulverize all or part of the rock fabric to produce bit flour, clay, or sand. The processes by which these and other less common bit-generated textures are formed and reach the drill-cutting samples are described. The generation of bit textures affects the quantitative and qualitative evaluation of the samples. These textures must be recognized to interpret samples correctly for lithology, porosity, and hydrocarbon shows.

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