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Great Lakes Energy Partners (Great Lakes) employed microseismic fracture imaging, which is only rarely done in the Appalachian region, during three hydraulic fracturing treatments in shallow Devonian-age completions in Linden Hall field in western Pennsylvania. The number of stages varied from well to well, as the “stacked” sands are discontinuous and not always of sufficient thickness or reservoir quality to warrant completion.
Typically, four to six stages are treated in the area. Multiple, overlapping fractures were mapped. Imaging indicated that vertical penetration of fractures into sand bodies, both above and below, was greater than would be anticipated with accepted knowledge. Early results from post-treatment production logging indicate that the adjacent stage fractures did not connect, even though the microseismic images indicated some degree of overlap in nearby horizons. More evaluation is needed to refine the interpretation of how created fracture geometry relates to production performance.
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