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Line 96: − − [[file:log-analysis-applications_fig4.png|thumb|{{figure number|4}}A traceplot displays trace values by their depth of occurrence. Users should carefully plan details of the display to maximize visual impact, legibility, amount of information conveyed, and any logical relationships in the data. (Traceplot. Copyright: Schlumberger. Faciolog is a trademark of Schlumberger.]] Line 111:
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→Data display
==Data display==
==Data display==
[[file:log-analysis-applications_fig4.png|300px|thumb|{{figure number|4}}A traceplot displays trace values by their depth of occurrence. Users should carefully plan details of the display to maximize visual impact, legibility, amount of information conveyed, and any logical relationships in the data. (Traceplot. Copyright: Schlumberger. Faciolog is a trademark of Schlumberger.]]
Data display is the most frequently used LAP feature. Properly displayed data allows users to do the following:
Data display is the most frequently used LAP feature. Properly displayed data allows users to do the following:
* Select consistent parameters for detailed log analysis calculations.
* Select consistent parameters for detailed log analysis calculations.
* Visually correlate all geological, core, wireline, geophysical, and engineering data both within each well and from well to well.
* Visually correlate all geological, core, wireline, geophysical, and engineering data both within each well and from well to well.
Visual examination of a specific formation across a broad area does the following:
Visual examination of a specific formation across a broad area does the following:
===Crossplots===
===Crossplots===
[[file:log-analysis-applications_fig5.png|left|thumb|{{figure number|5}}A Pickett plot allow users to interactively draw a line intersecting water wet points (''S''<sub>w</sub> = 100%). This line identifies the cementation exponent (''m'') and the product of a × ''R''<sub>''w''</sub> (empirical constant × formation water resistivity) and relates water saturation (''S''<sub>w</sub>) to porosity and true resistivity.]]
[[file:log-analysis-applications_fig5.png|300px|thumb|{{figure number|5}}A Pickett plot allow users to interactively draw a line intersecting water wet points (''S''<sub>w</sub> = 100%). This line identifies the cementation exponent (''m'') and the product of a × ''R''<sub>''w''</sub> (empirical constant × formation water resistivity) and relates water saturation (''S''<sub>w</sub>) to porosity and true resistivity.]]
''Crossplots'' (''XPLTs'') relate two or more different trace values to each other at the same depth, such as core [[porosity]] and bulk density. Each type of wireline tool measures a different rock property. By studying the same XPLT in many wells, distinctive data plot patterns related to these rock properties allow users to identify lithologies, porosities, parameters, and other geological and/or engineering relationships.
''Crossplots'' (''XPLTs'') relate two or more different trace values to each other at the same depth, such as core [[porosity]] and bulk density. Each type of wireline tool measures a different rock property. By studying the same XPLT in many wells, distinctive data plot patterns related to these rock properties allow users to identify lithologies, porosities, parameters, and other geological and/or engineering relationships.
[[file:log-analysis-applications_fig6.png|thumb|{{figure number|6}}Dual plot contains crosspiot (featuring data isolator polygon) and traceplot. User interactively draws polygon on the screen, which identifies the enclosed data in the database. Corresponding depths are immediately marked on the traceplot, in this case with tic marks.]]
[[file:log-analysis-applications_fig6.png|300px|thumb|{{figure number|6}}Dual plot contains crosspiot (featuring data isolator polygon) and traceplot. User interactively draws polygon on the screen, which identifies the enclosed data in the database. Corresponding depths are immediately marked on the traceplot, in this case with tic marks.]]
Several interactive graphic XPLT techniques and other features have been developed that make crossplots even more useful and powerful:
Several interactive graphic XPLT techniques and other features have been developed that make crossplots even more useful and powerful:
* Three-dimensional plots, allowing rotation of the XPLT around the ''x, y'', and ''z'' axes. This usually requires specialized high performance graphics hardware.
* Three-dimensional plots, allowing rotation of the XPLT around the ''x, y'', and ''z'' axes. This usually requires specialized high performance graphics hardware.
[[file:log-analysis-applications_fig7.png|left|thumb|{{figure number|7}}A two-well histogram allows users to compare data interactively from one well to another by shifting the second well's data across the base well on the screen. A visual best fit is usually satisfactory for determining the amount of normalization required.]]
[[file:log-analysis-applications_fig7.png|300px|thumb|{{figure number|7}}A two-well histogram allows users to compare data interactively from one well to another by shifting the second well's data across the base well on the screen. A visual best fit is usually satisfactory for determining the amount of normalization required.]]
===Histograms===
===Histograms===