course 4: using advancedwell editor tools. log curves are resampled
TRANSCRIPT
Course 4: Using AdvancedWell Editor Tools
Log curves are resampled
Best guess of what initial time shift should be
Click apply to continue
Place and
The initial shift was a best guess that can be checked by undertaking a cross correlation
Select window of time
Improve correlation by shifting
Use phase and time sliders
Window calculations to 0.95 to 1.56 and use phase and time sliders to maximize correlation coefficient
OK
Ok to continue …
Zoom in on zone of interest and edit > time alignment
Click events in the synthetic and actual data to tie > Apply
Once applied they are tied in, but you can click the undo button
File > Save As …
Checkshot obs at 100 to 200 m ints
Travel paths include multiples, direct and reflections
Correct to true vertical depths
Tools > TVD editor
Select curves by draging mouse over them and apply >
OK to return and File > Save as to save as LogM > OK
Name > OK > OK
Note TVD’s are a little less than MD
File > Close All
Checkshot editor > Open well > Tools > Checkshot editor > add check shot times and depths to the table
File > save > Label (field data checkshots) > OK > Apply7
Note selections
View Vel from Corrected sonic then View > Fit Curve > have a look and exit
View > Select Curves > clear all>
Select curves to display
Sonic
Cor sonic field
Sonic Drift
CS Vel Field
Density
Gr
Adjust view
Note influence of TVD correction
File > Save As
Align remaining wavelets
Open File (original)
Then View > Select Curves
Clear All
Sonic, Density and GR
Switch to time mode (view time mode)
Synthetics > synthetics > wavelets
Place normal traces next to sonic log
Activate check shot display corrected window
Switch to time mode
Create synthetic using corrected field check shots in the synthetic > Curve selection field.
Wavelets
Place your synthetic
View > align wells option
Use a formation top
Note differences in start time
Then file > plot > default synthetic layout > select group 1
File > plot set up
In schematic mode you can rearrange various boxes
File > Exit
Close all wells (file > close all)
Exercise complete
Open a well with synthetcs >
Synthetics > Delete synthetic to delete synthetic panel if needed. For example to get rid of a synthetic usinga wavelet not considered realistic.
Edit > Time depth controls
Toggle on time/depth check box
Change sample interval to 2 ms
Apply shaping filter
Tools > extract wavelet > shaping filter (uses reflection coefficients and seismic data)
Now look at cross correltaion graph
Align > cross correlation graph (from tool bar
Align time and phase to maximize correlation.
Now apply hsaping filter again
Action > Set extraction data
OK
Action > Extract Wavelet > Weiner LEvenson
Focus on extracted wavelets
Options > align wavelets > automatic check box (on) > apply > close
Options > Taper Bartlet
Wavelet lengh 100, taper length 25
Options > Align Wavelets
3 for zero lag point > apply
Click highlihgted area of display
Helps to center wavelets
Close > File Save > Log M >
Save average wavelet
File > Exit
Synthetics > Synthetic
Wavelets > File wavelet
Open your wavelet file and > add Wavelet
OK
Locate normal traces on the display panel
Edit Wavelets
Tools > Wavelet Editor > Select the extract file (wavelet you created
Edit > Wavelet in the wavelet editor
View > Show reference point
Edit > Smooth
6th icon from the top on the left hand toolbar
Displays amplitude scale
View > Scale (choose appropriate value
OK to continue
Edit > Draw
Draw in curve and click OK to continue
redrawn
Phase > seventh icon down from the top
Edit Smooth
Define operator length (say 35) (note the methods available) Boc car used in this example> OK > note changes
Save As > log M wavelet file type> give it a name > save > OK > exit
To return to Well Editor screen
Create new synthetic using the corrected wavelet and compare
Select Synthetics from Synthetic
Wavelets> File Wavelet> browse to your new wavelet > select > Add Wavelet > OK
Place synthetic (normal traces) >
File close all
Math tool kit will calculate a shale volume curve from the GR curve
Open file >
In Well Editor Menu Bar select > Tools > Math Tool Kit
Enter name,
Create constant
Click New > turn on imperial and metric values
OK
Create another constant: New > All Shale
115 as metric and Imperial values
Note existing curves and function box
Save and place the new curve
From Edit > Log Scales select ShVol
0 to 100%, OK to apply and save
Generate a set of curves showing influence of water oil and gas in the formation
First generate new shear sonic and Poisson ratio asuming 100% wet saturation
Create copy of your log display file (texas gas _ fluid sub > OK
Now generate new curves
Tools > fluid substitution
Next (if accept the defaults)
Here we select the ShVol curve calculated in the previous exercise > next
Examine and finish
Place the new curves
Sh sonic in situ
PR in situ
Edit > Log Scales
Shear sonic In Situ
Edit> Copy curve > to make copies of curves
Density , sonic, sonic insitu, density and PR in situ
Place
Confirm name for new copy (numeral 1 appended)
They will appear 1 x 1
Next exercise we will recalculate
Resize > tools > open Fluid substitution
Turn off in-situ saturation 100% wet under VP/VS trends
Enter start and end depths (ZOI)
Next
Under in-situ fluit properties select gas
Enter brine salinity of 40,000 (ppm)
Gas specific gravity 0.6
Constants > degrees centigrade
Check pressure and change to 40,000 kPa
Next
View and Next Turn on the following check boxes and Finish
Click to place new porosity curve
EWdit curve header menu option to change labels
They changed the copied 1’s to Wet others to gas
Drag and drop curves on top of each other for comparison
Now – Oil substituted for gas
Use the gas curves as input
Edit > copy curve and make copies of all gas curves
Select Density Gas PRInSitu Gas SHSonicInsitu Gas and Sonic Gas
Then place (insert to left).
You will get a series of proposed curve labels which you can change or OK
Tools > Fluid Substitution
Process > fluid substitution
Enter start and end depths
Select Porosity and > LC Next
Retains settings
Select Pressure tab
Select substitute fluid properties tab & light oil
Brine salinity to 40,000, 40 for oil gravity, change water saturation to 30% > Next
Make sure shale volume curve is selected
Select desired output types
finish
Edit curve header option to remane the 4 gas curves to oil curves > Close
Drag and drop to compare water to gas to oil
Save and give new ID
… gas fluid sub final
End course 4