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True resistivity determination (view source)
Revision as of 13:23, 30 June 2014
, 13:23, 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 (S<sub>w</sub> = 100%) or formation water and hydrocarbons (S<sub>w</sub> t 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==
| Correct for this bed using appropriate service company chart
| Correct for this bed using appropriate service company chart
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| Bed is shallow, medium, and deep investigating tools measure, different resistivities (i.e., log has step profile)
| Shallow, medium, and deep investigating tools measure different resistivities (i.e., log has step profile)
| Correct for invasion using appropriate service company tornado chart
| Correct for invasion using appropriate service company tornado chart
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