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True resistivity determination (view source)
Revision as of 13:51, 30 June 2014
, 13:51, 30 June 2014no edit summary
| isbn = 0-89181-602-X
| isbn = 0-89181-602-X
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The true resistivity (R<sub>t</sub>) of a formation is its resistivity when not contaminated by [[drilling fluid]]s. It may contain formation water only ([[water saturation]] [S<sub>w</sub>] = 100%) or formation water and hydrocarbons (S<sub>w</sub> < 100%). Using a valid R<sub>t</sub> is fundamental when analyzing well logs for the presence of hydrocarbons. For a discussion of resistivity concepts see Asquith, 1982.
The true resistivity (R<sub>t</sub>) of a formation is its resistivity when not contaminated by [[drilling fluid]]s. It may contain formation water only ([[water saturation]] [S<sub>w</sub>] = 100%) or [[formation water]] and hydrocarbons (S<sub>w</sub> < 100%). Using a valid R<sub>t</sub> is fundamental when analyzing well logs for the presence of hydrocarbons. For a discussion of resistivity concepts see Asquith, 1982.
==How invasion affects r<sub>t</sub> measurement==
==How invasion affects r<sub>t</sub> measurement==