STUDY OF STRESS IN DEVONIAN SHALE: PART I - 3D STRESS MAPPING USING A WIRELINE MICROFRAC SYSTEM.

K. F. Evans, J. T. Engelder

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Abstract

The authors describe an experiment to characterize in detail variations in the state of stress within a horizontally-bedded sandstone/shale limestone sequence in western New York. The measurements were made using a new wireline-based 'microfrac' system which, by its nature, permits frequent sampling of stress. Three wells, 1 km or so apart featured in the study. In one well, 43 intervals were tested to 1 km depth. The measured stress-profiles in all three wells show an identical pattern of stress variations. Two stratigraphic regimes of markedly different stress ratio are recognized which are separated by a transition zone. Within this zone variations in stress are clearly correlated with lithology.

Original languageEnglish (US)
Publication statusPublished - Dec 1 1986

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All Science Journal Classification (ASJC) codes

  • Engineering(all)

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