纯砂岩 clean sandstone; net sandstone 粗砂岩 farewell rock; greet stone; grit stone; gritrock; gritstone; grouan; growan; r ..
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对纯砂岩，当孔隙度大于28%时存在明显纵波声频散。
For clean sandstone, the acoustic dispersion of compressional wave exists obviously when its porosity is more than 28%.
纯砂岩的校正精度百分误差小于5%； 泥质砂岩校正误差绝大多数小于10%。
Correction accuracy for clean sand and most of the shaly sand is less than 5% and 10% respectively.
阿尔奇公式是用纯砂岩模型建立的理论方程，应用于不同性质的储集层中，是测井资料综合解释的基础。
Archie formula is established theoretically in clean sandstone model and applied to various reservoirs. It is the fundamentals of log interpretation.
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