Dictionary:Class 1, 2, 3, 4 reservoirs

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{{#category_index:C|class 1, 2, 3, 4 reservoirs}} A classification of reservoir sands according to their normal-incidence impedance contrasts with surrounding rocks (and their AVO responses). Also written with Roman numerals: class I, II, III, IV. See amplitude variation with angle/offset (AVA/AVO), Figure A-12, and Rutherford and Williams (1989).