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Line 16: − {| class = "wikitable"+ − |-+ − ! Step || Action+ − |-+ − | 1 || Plot points of matching [[porosity]] and true resistivity (R<sub>t</sub> ) on log-log paper.+ − |- − | 2 || Plot R<sub>w</sub> point on the R<sub>t</sub> scale. − |- − | 3 || Determine ''m'' using the table of values. − |- − | 4 || Plot the 100% S<sub>w</sub> line. − |- − | 5 || Plot the lines representing lower values of S<sub>w</sub> . − |}
Pickett plot construction (view source)
Revision as of 14:37, 27 October 2014
, 14:37, 27 October 2014no edit summary
A Pickett plot lets us compare water saturations of different parts of a reservoir in one or many wells. The Pickett plot<ref name=ch09r45>Pickett, G., R., 1973, Pattern recognition as a means of formation evaluation: The Log Analyst, vol. 14, no. 4, p. 3–11.</ref> is a visual representation of the [[Archie equation]]<ref name=Archie_1942>Archie, G. E., 1942, The electrical resistivity log as an aid in determining some reservoir characteristics: Petroleum Transactions of AIME 146: 54–62.</ref> and therefore is a powerful graphic technique for estimating S<sub>w</sub> ranges within a reservoir. All that is needed to make a Pickett plot is a set of porosities and corresponding resistivities taken from well logs and 2×4 cycle log-log paper. The procedure for making a Pickett plot consists of five steps, detailed below.
A Pickett plot lets us compare water saturations of different parts of a reservoir in one or many wells. The Pickett plot<ref name=ch09r45>Pickett, G., R., 1973, Pattern recognition as a means of formation evaluation: The Log Analyst, vol. 14, no. 4, p. 3–11.</ref> is a visual representation of the [[Archie equation]]<ref name=Archie_1942>Archie, G. E., 1942, The electrical resistivity log as an aid in determining some reservoir characteristics: Petroleum Transactions of AIME 146: 54–62.</ref> and therefore is a powerful graphic technique for estimating S<sub>w</sub> ranges within a reservoir. All that is needed to make a Pickett plot is a set of porosities and corresponding resistivities taken from well logs and 2×4 cycle log-log paper. The procedure for making a Pickett plot consists of five steps, detailed below.
# Plot points of matching [[porosity]] and true resistivity (R<sub>t</sub> ) on log-log paper.
# Plot R<sub>w</sub> point on the R<sub>t</sub> scale.
# Determine ''m'' using the table of values.
# Plot the 100% S<sub>w</sub> line.
# Plot the lines representing lower values of S<sub>w</sub> .
==Step 1: Plot points==
==Step 1: Plot points==