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Contours>Grids>Compute Statistics from Around Wells...
This function uses a contour grid file to compute values within an area around each well on the map. You can compute either volumetric's within a circle or statistics within an elliptical area around each well.
DATA TAB
Value to Compute at Each Well on Map
Grid Volume At the Well - This option computes values equal to the volume within a specified radius around each well. (see Volumes tab)
Grid Statistics (Average, Min, Max, etc) - This option computes statistical values within an oriented ellipse around each well. (see Statistics tab)
Grid File To Compute Values From
Select the grid file used for calculations.
Zone Item To Store Computed Value For Each Well
Select the zone and zone item for storing the computed results for each well. You may select an existing zone item of type in a name to create a new item in the selected zone.
VOLUME TAB
This section describes options available when the volume option is chosen on the data tab.
Area Specified As
Radius In XY Units - The area parameter (see below) is specified as a radius of a circle in xy map units (feet or meters).
Acres - The area parameter (see below) is specified as the number of acres in a circle around each well.
Area Around Each Well Is
This option allows the area value to be set as a constant value for all wells or it can vary from well to well by using a zone item for the area. In either case, the value must be in the units specified by the 'Area Specified As' parameter.
Volumetrics Lower Data Limit
This option allows you to set a lower limit for volume calculations. For example, if a grid contained values from 0 to 100, a lower limit of 50 would restrict the volumes to be computed for 50 to 100 only.
Scale Resulting Volumes By
Enter any multiplication factor you wish to be applied to the computed volumes. Note that when the 'Area Specified As' parameter is acres, then the volume will automatically be scaled to acre-foot as well.
STATISTICS TAB
This section describes options available when the statistics option is chosen on the data tab. Results are determine using all grid node values and grid cell center points falling inside a specified elliptical area around each well.
Statistical Value To Be Computed
Select the type of value to be computed around each well. Options are:
·Average Value
·Minimum Value
·Maximum Value
·Sum
Compute Values Within an Oriented Ellipse with the Following Dimensions
Define the dimensions and orientation of an ellipse by specifying the length (semi-major axis), width (semi-minor axis) and azimuth relative to a compass heading.
You can also use the "Compute Dimensions From Acres" button to set the length and width values by entering the area of the ellipse in acres and the ratio of length to width.
Output Ellipses To \GRIDS\ELLIPS.TXT
Check this option to export a file called "ellips.txt" to the project's "grids" folder containing polygons suitable for importing into the map overlay. Each polygon is an ellipse centered at a well. The file contains x, y, and segid and can be imported as polygons using the "Overlay>Load>Generic ASCII File"
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