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Reservoir Evaluation and Geologic Modeling for the Clinton Eastern Tight Gas Formation. Phase 1, Final Report

机译：克林顿东部致密气成藏储层评价与地质模拟。第1阶段，最终报告

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In an effort to better understand the geologic and engineering factors that explain the production performance of the tight Clinton Sandstone of Eastern Ohio, Log cumulative gas production vs the log of producing time curves, logs and completion data were evaluated for a number of Clinton sandstone wells in the Tuscarawas, eastern Coshocton and eastern Holmes County area of east central Ohio. The wells were divided into low slope (<0.6), Linear, and high slope (>0.6), Radial, groups, based on plots of log cumulative production vs log time. The distributions of expected recoveries from these two groups of wells were compared using the Chi Square and Pearson's P-M correlations, and were found to be significantly different. The linear wells had a median expected ultimate recovery of less than 20 MMCF while the radial group had a median of more than 50 MMCF. Both the radial and linear distributions were polymodal, and were divided into low, transitional and high production segments. A reasonable hypothesis is that the high productivity wells were producing from reservoirs in which the permeability was augmented by fracturing. The logging suite generally used for the Clinton wells evaluation was not adequate to use as a basis for predicting well performance with any high degree of certainty. However, the calculated production from the low slope wells exhibited a reasonable correlation with the actual cumulative production at the breakpoint on the log cumulative production vs log time curves (this breakpoint indicates that the reservoir boundary has been encountered). 11 references, 21 figures, 4 tables. (ERA citation 10:019908)

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