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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Archie's law ： ウィキペディア英語版 Archie's law In petrophysics, Archie's law relates the in-situ electrical conductivity of a sedimentary rock to its porosity and brine saturation: :$C\_t\; =\; \backslash frac\; C\_w\; \backslash phi^m\; S\_w^n$ Here, $\backslash phi\backslash ,\backslash !$ denotes the porosity, $C\_t$ the electrical conductivity of the fluid saturated rock, $C\_w$ represents the electrical conductivity of the brine, $S\_w$ is the brine saturation, $m$ is the cementation exponent of the rock (usually in the range 1.8–2.0 for sandstones), $n$ is the saturation exponent (usually close to 2) and $a$ is the tortuosity factor. Reformulated for electrical resistivity, the equation reads :$R\_t\; =\; a\; \backslash phi^\; S\_w^\; R\_w$ with $R\_t$ for the fluid saturated rock resistivity, and $R\_w$ for the brine resistivity. The factor :$F\; =\; \backslash frac\; =\; \backslash frac$ is also called the formation factor, where $R\_o$ is the resistivity of the rock filled with only water ($S\_w=1$). The factor :$I\; =\; \backslash frac\; =\; S\_w^$ is also called the resistivity index. It is a purely empirical law attempting to describe ion flow (mostly sodium and chloride) in clean, consolidated sands, with varying intergranular porosity. Electrical conduction is assumed not to be present within the rock grains or in fluids other than water. Archie's law is named after Gus Archie (1907–1978) who developed this empirical quantitative relationship between porosity, electrical conductivity, and brine saturation of rocks. Archie's law laid the foundation for modern well log interpretation as it relates borehole electrical conductivity measurements to hydrocarbon saturations (which, for fluid saturated rock, equals $1\; -\; S\_w$). ==Parameters== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Archie's law」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.