This document provides instructions for splicing together logging data from different logs that measure similar properties into a single composite log. It describes two methods: 1) Using the Operations tab to splice logs for a single well. The logs are merged and the redundant log is deleted. 2) Using the Well Calculator to perform a global splice of logs across multiple wells by creating a new log with an IF statement that combines the top and bottom logs. It also provides steps for filling in missing or undefined intervals in the spliced log by drawing in values or interpolating between nearby points.

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Splicing Log on Certain Depth

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1. Splicing Logs Using the Operations Tab
During import, new global well logs can be created because
the names have changed slightly (they are, essentially, the
same logs). These should become one log.
1. Go to Settings > Operations tab for
the Global log to keep (e.g., Gamma).
2. Select the log to be added (e.g., GR).
3. Click the Run adding button.
4. When you are SURE you have
merged the logs, delete the remaining
old well log.
Gamma
GR
New
Gamm
a
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2. Splicing Logs Using the Calculator
To perform a global splicing of logs on many wells or all wells, use the
Well Calculator. The sections to splice are assumed to be already loaded.
1. Open the Calculator
from the Global well logs
folder to perform the
splicing on all the wells.
2. Make a new log (here:
GR_Splice) using an If
statement.
3. Display all of them to
verify that the operation
was correctly done.
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GR_Top + GR_Bottom = GR_Splice

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Filling Missing Intervals
If the new curve has a missing interval and
the interval should not be undefined, it can
be fixed or even interpolate between the
closest points.

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1. Drawing Missing Intervals after Splicing (1)
If the new curve has a missing
interval and the interval should
not be undefined, it can be fixed.
1. Right-click on the curve
and select Log editor.
2. Select Action #1: Draw.
3. Use the cursor in the
Well section window to
draw the selection. (It
automatically fills in the
value and depth).
Optionally, enter the
values manually.
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Drawing Missing Intervals After Splicing (2)
Action
Zone
Calculate the correct estimated value at the correct depth.
1. Set the cursor just
above and below the
missing interval; an
Action Zone appears.
2. Pick the red value
point editors and move
to the correct positions.
3. Click Apply and Run.
4. View the result in the
well section.
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2. Interpolate Missing Undefined Values
If small sections of the log are missing, interpolate between the
closest points, either on all the wells at the Global well logs level
or at a specific depth interval using Log editor at the well level.
1. Open the Log Editor for the Global well logs.
2. Select Change Undef from the drop-down menu.
3. Choose Interpolate as method to use.
4. Click Apply and Run.
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