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- Title
Estimation of Permeability from NMR Logs Based on Formation Classification Method in Tight Gas Sands.
- Authors
Wei, Deng-Feng; Liu, Xiao-Peng; Hu, Xiao-Xin; Xu, Rui; Zhu, Ling-Ling
- Abstract
The Schlumberger Doll Research (SDR) model and cross plot of porosity versus permeability cannot be directly used in tight gas sands. In this study, the HFU approach is introduced to classify rocks, and determine the involved parameters in the SDR model. Based on the difference of FZI, 87 core samples, drilled from tight gas sandstones reservoirs of E basin in northwest China and applied for laboratory NMR measurements, were classified into three types, and the involved parameters in the SDR model are calibrated separately. Meanwhile, relationships of porosity versus permeability are also established. The statistical model is used to calculate consecutive FZI from conventional logs. Field examples illustrate that the calibrated SDR models are applicable in permeability estimation; models established from routine core analyzed results are effective in reservoirs with permeability lower than 0.3 mD, while the unified SDR model is only valid in reservoirs with permeability ranges from 0.1 to 0.3 mD.
- Subjects
PERMEABILITY measurement; SAND; FLUID dynamic measurements; POROSITY; NUCLEAR magnetic resonance; ROCKS -- Classification
- Publication
Acta Geophysica, 2015, Vol 63, Issue 5, p1316
- ISSN
1895-6572
- Publication type
Article
- DOI
10.1515/acgeo-2015-0042