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The AAPG/Datapages Combined Publications Database

Wyoming Geological Association


Wyoming Gas Resources and Technology; 52nd Field Conference Guidebook, 2001
Pages 200-200

ABSTRACT: Net Previous HitEffectiveNext Hit Pay Determinations Using Nuclear Magnetic Resonance and Borehole Imagery

Roger R. Reinmiller1


In order to evaluate reservoir economics, geologists and engineers need the parameters of Previous HiteffectiveNext Hit permeability (K Previous HiteffectiveNext Hit) and net reservoir pay (h). Integrating nuclear magnetic resonance (NMR) technology with borehole imagery can significantly improve estimates of these two parameters. In clastic reservoirs, NMR is used to differentiate and measure claybound water, capillary-bound water and free fluid. From these data, permeability Previous HiteffectiveNext Hit to gas can be estimated. Borehole imagery is a high-resolution tool that can be used to refine measurements of h by differentiating net pay from gross reservoir thickness.

Disappointing well completions might be avoided with more realistic economic evaluations. Using NMR to measure K Previous HiteffectiveTop is a relatively common practice. However, using borehole imagery to evaluate h is relatively uncommon. Estimates of h are needed for hydraulic stimulation design and for estimations of hydrocarbons in place. Usually engineers and geologists calculate h from a conventional gamma ray curve. This practice can significantly overestimate h. In some cases, using borehole imagery has improved the accuracy of h by a factor of two.


Acknowledgments and Associated Footnotes

1 Baker Atlas, Denver, CO

Copyright © 2005 by the Wyoming Geological Association