The rock catalog module within GEMINI is designed to provide core and log petrophysical information for data sets that are defined by the user. Because most rock catalogues are printed products, they define the relational context in which petrophysical data are presented. Generally catalogues present rock information in page format as either;
The GEMINI Rock Catalog has been designed to allow the user to query all petrophysical data contained in the database, define the nature of the dataset to be evaluated based on multiple selection criteria, and construct an output web page that includes summaries of the data in figure and number form. This allows the user to construct their own rock catalog pages designed to summarize and present information that they have defined. With the present version of GEMINI, the selection criteria are based on the relevant available fields in the petrophysical database.
Users can select multiple additive criteria to define a BASE dataset that analyzes the data for a select subset of the total database of petrophysical information. With each selection criteria the total number of samples in the database that have data for all selection criteria is provided to allow evaluation of the size of the population being examined and analyzed. For quantitative criteria, such as porosity, the range of values present in the database is displayed and is initially defined as the default selection criteria. If the User wishes to only examine samples within a specific range they can redefine the minimum and maximum values for the selection criteria.
In this case, all available wells are highlighed. Note in the upper right hand corner that the total record count is 4268.
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Next the user refines the selection to Lithology by pressing the “select to view criteria limits” bar. Then, the user sees the lithology menu and in this case selects NM Sand, standing for nonmarine sand. In this dialog shown, the user has selected the criteria and has added them as constraints search listed in the white box. |
4. Click on the Process Request
which brings up a animated pump jack and the user sees a pump jack and a message
that the query is being processed. This should take a few seconds.
Click on the Add Overlays tab (second line of options on the right side of the menu). The user can define up to 6 Overlay datasets that will allow definition of subsets of the Base dataset or completely different datasets, so that comparison between the overlay and base dataset(s) can be performed.
Select the Modify Symbol & Color button to change the default
colors and symbols to
distinguish this layer that will be included on charts.
6. Click on the Cross Plots tab (first line, center)
Cross-plot allows User definition of the variables assigned to the X-axis and Y-axis. Variables available for either axis include all variables in the petrophysical database. Axes can be formatted in either linear or log base 10 format. Click on the View button (right side of menu)
Click the Save button and proceed to the next step.
7. Click on the Histogram Plots tab (first line, right-center) to define data sets for x-axis, range of x-axis, and number of intervals.
Click the Save button and proceed to the next step.
8. Click on the Core Images tab (first line, right-most tab) to select the routine whole core porosity, selecting the title, range and increment of the X and Y axis.
Click on the View button to see the resulting plot (see below example).
To see the Core Image select the Well and corresponding top and bottom (from the list) and click Select Image to View. Next click on the Image button (lower center)
Title, description modify Symbol and Color (similar to Histogram) can be added. Click on the View button.
Click the Save button.
For more detailed information on the Well Profile Module see the Well Profile Tutorial (http://www.kgs.ku.edu/Gemini/Help/WellProfile/WPtutorial.html.