Extract Interval Data to Zone

  
Main: Compute > From Interval Data > Extract Interval Data To Zone

It is sometimes useful to extract data from intervals to a zone.  Zones are easily used in calculations and mapping.  

Data tab

Extract Interval Data From

Selects the interval table, field, and what will actually be saved to the zone.  The 2nd and 3rd drop down lists are populated with available options for the interval type selected.

Extract To

Selects where the interval data will be stored.  Note: that this tool uses the selected zone's definitions (where fm tops or depths define the top and base of the zone) to limit the extraction only to intervals intersecting the zone.  A default zone definition of -99999 to 99999 will include every interval in the wellbore.

When

Petra can store the interval data meets the following criteria:

  • When the item is present—stores the interval field value to the zone data item when the interval data contains a value.  

  • Item is absent—stores the value when the interval data field is null.  Practically, this option is only useful when extracting the sum/average of interval thicknesses or interval counts.  As an example, extracting a count of intervals when the porosity interval data is absent generates a well-by-well count of intervals missing porosity values.  

  • Range—stores the interval field value when the field value falls between a minimum and maximum value.

  • Contains tex—stores the interval field data when the interval field contains specified text.

  • Matches text—stores the interval field data when the interval field exactly matches the specified text.

Options tab

The Options tab contains further options for limiting the intervals used in the extraction.  

Restrict Intervals By Selected Zone

By default, Petra only uses intervals that intersect the selected zones definitions (where Fm tops or depths define the top and base of the zone).

Undefined zones extend from -99999 to 99999 MD, which includes every interval in the wellbore.

Deselecting Restrict Intervals By Selected Zone will not limit intervals by zone definitions.

Restrict Intervals to Quality Contains

limit intervals by entering quality codes

Restrict Intervals to Fm Name Contains

limit intervals by entering a FmName  

Method to Compute Average Values

When computing an average value for the interval, Petra normally uses weighted averages, where thicker intervals contribute more to the average than thin intervals.  Selecting Compute UnWeighted Average gives equal weight to all values regardless of interval thickness

Set Computed Values of Zero to NULL

The Set Computed values of zero to null sets extracted values of zero to a null value.

Use Filter to Restrict Intervals

Filters provide more control over which intervals are used in the zone extraction.   Intervals that do not meet the filter criteria do not contribute to a zone data item.  To create or modify a set of filters, select the Set Filters…button on the Filters tab.

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