Geologic cross section
Geologic cross-section (sometimes called X-section) is usually constructed by a geologist interested in the well. The line of section or surface location of the cross-section is shown on a structure map. The various fault segments for the well are shown by the solid lines. The geologic cross-section is constructed with one-inch or five-inch logs and frequently only shows the lower section of the hole. All pressure transition sections and the production interval should be shown. The stick chart, of course, starts at the surface or mud line to reveal all problems. This particular chart should have many features included wherever they exist; specifically:
Mud weights, faulting and formation dips, casing setting depths, possible correlations, location of possible kicks, location of possible lost circulation zones, and abnormal pressure zones.
The cross-section and stick charts provide a history of each well used for correlation.
During the drilling operation, the cross-section and stick charts are utilized for well surveillance as the mud logger correlation is developed day-by-day. This surveillance is necessary to be certain that no feature has been overlooked or to identify changes in the well plan based on unforeseen changes in geological or other parameters. Sometimes casing seats must be changed to match the geological events in the new hole. Sometimes the geologists have only included correlation wells that assisted in developing the plans for a well to produce hydrocarbons. Other wells may have been drilled in the area that did not interest the geologist but would have significant impact on a drilling plan.
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