Archie's law

（重定向自Formation factor）

In petrophysics, Archie's law relates the in-situ electrical conductivity of a sedimentary rock to its porosity and brine saturation:

Here, $\phi\,\!$ 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.

单词	Formation factor
释义	Formation factor 英语百科 Archie's law （重定向自Formation factor） In petrophysics, Archie's law relates the in-situ electrical conductivity of a sedimentary rock to its porosity and brine saturation: Here, $\phi\,\!$ 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.
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