Application of binomial-edited CPMG to shale characterization
Unconventional shale resources may contain a significant amount of hydrogen in organic solids such as kerogen, but it is not possible to directly detect these solids with many NMR systems. Binomial-edited pulse sequences capitalize on magnetization transfer between solids, semi-solids, and liquids to provide an indirect method of detecting solid organic materials in shales. When the organic solids can be directly measured, binomial-editing helps distinguish between different phases. We applied a binomial-edited CPMG pulse sequence to a range of natural and experimentally-altered shale samples. The most substantial signal loss is seen in shales rich in organic solids while fluids associated with inorganic pores seem essentially unaffected. This suggests that binomial-editing is a potential method for determining fluid locations, solid organic content, and kerogen–bitumen discrimination.
Citation Information
Publication Year | 2014 |
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Title | Application of binomial-edited CPMG to shale characterization |
DOI | 10.1016/j.jmr.2014.06.014 |
Authors | Kathryn E. Washburn, Justin E. Birdwell |
Publication Type | Article |
Publication Subtype | Journal Article |
Series Title | Journal of Magnetic Resonance |
Index ID | 70119892 |
Record Source | USGS Publications Warehouse |
USGS Organization | Central Energy Resources Science Center |