Transcript Hampson-Russell

Create Well Database
Hampson-Russell
Geoview
Well Database
Load Logs
Load Tops
Delete Tops
Check Shot
Elog
Strata
A well database contains wells and
formation tops for an area, and each well
contains several logs. Seismic data can
also be loaded into the database, but this
is explained in the Elog module.
The files needed can be downloaded from
here:
http://www.ipt.ntnu.no/e-learning/seismics/
Create a new database by accessing the
’New’ option under the ’Database’ pulldown menu.
Type in an appropriate name for the
database and click ‘OK’.
Well logs, horizon and seismic data needs
to be added to the database.
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References
Load Logs
Hampson-Russell
Geoview
Well Database
Select the ‘Group of Logs’ option under
the ‘Load Logs’ pull-down menu.
Load Logs
Load Tops
Delete Tops
Check Shot
Elog
Strata
Select the ‘General ACII’ option as file
format and click on the ‘New Well’
label.
Type in specifications for Well_1 as
shown in the appearing window and
click ‘OK’ when done. You are now
getting prompted to specify which
file to load.
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References
Load Logs
Hampson-Russell
Geoview
Well Database
Select the file containing the log
information and click ‘OK’.
Load Logs
Load Tops
Delete Tops
Check Shot
Elog
Strata
The log file has one header line
which must be skipped when
reading the file. The sampling is
not uniform, and the depths are in
column# 1.
Fill in the form as shown to the
right. Header information abut the
columns in the log file can be
obtained by clicking the ‘Display
File’ button. The elastic impedance
log is generated at 36.
The log names must be unique
within the same well. That is, there
can exist two ‘EI/Vp’ in different
wells at the same time, but not in
the same well.
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References
Load Formation Tops
Hampson-Russell
Geoview
Well Database
Load Logs
Load Tops
Delete Tops
Check Shot
Elog
Strata
Formation tops are stored in a separate
file and these need to be added to the
well.
Click the ‘Tops from File’ option under
‘Load Tops’ and select ‘fmtop_well_1’ as
shown.
Complete the form as shown to the right.
The file has four header lines which must
be skipped.
The formation thicknesses are specified
in the file. By selecting the ‘Unspecified’
option, only the formation tops and not
the base are added.
Click ‘Ok’ when done. Also click ‘Ok’ on
the next window.
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References
Delete Formation Tops
Hampson-Russell
Geoview
Well Database
Load Logs
Load Tops
Delete Tops
Check Shot
Elog
Strata
Two of the tops are not needed and
should be deleted.
Select the ’Display Well List’ from the
Geoview window and proceede by
marking ’Well_1’ and then click the
’Display Tops’ button.
Mark the ’Top’ in the appearing
windown and click the ’Delete Top’
button. Also delete ’top0’.
Continue by clicking the ’Ok’ button.
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References
Check Shot Correction
Hampson-Russell
Geoview
Well Database
Load Logs
Load Tops
Delete Tops
Check Shot
Elog
Strata
Due to uncertainties, the P-wave log
only rarely matches the two way
travel time on the seismic. Hence
needs the P-wave log to be corrected.
It is common to shoot a check shot
table by placing sensors in the bore
hole and fire an air gun from the rig as
shown to the right. These travel times
are converted to interval travel times
corresponding to the P-wave log, and
a drift curve is computed. This curve is
then used for interpolation.
The file ‘Well_1_TD.las’ contains the
check shot table needed for this
process.
Courtesy: Goetz, J.F. Dupal, L., Bower, J.
Info
References
Check Shot Correction
Hampson-Russell
Geoview
Well Database
Load Logs
Load Tops
Delete Tops
Check Shot
Elog
Strata
Select the ‘Single Log’ option from
the ‘Load Logs’ menu. Load the
time-depth table as ‘check shot’
log into Well_1 as shown.
Select the ‘Well_1_TD.las’ file,
and select ‘TIME’ appearing in the
next window. Click ‘Ok’.
The ‘las’ format specifies
information about the logs
included in the file in the file
header.
Click ‘OK’ on the next two
windows.
The check-shot log should now be
successfully added and we are
ready to do the check-shot
correction.
Info
References
Check Shot Correction
Hampson-Russell
Geoview
Well Database
Load Logs
Load Tops
Delete Tops
Check Shot
Elog
Strata
Click on the ‘Display Well List’ button
in the Geoview window. This enables
access to the well database where
single logs can be inquired. Deletion of
wells and well logs is also possible
from the appearing windows.
Mark ‘Well_1’ in the ‘Display Wells
Menu’ and click on the ‘Display Logs’
button.
Click on the ‘Check Shot Correction’
under ‘Options’ in order to perform
check shot correction to the well.
Info
References
Check Shot Correction
Hampson-Russell
Geoview
Well Database
Load Logs
Load Tops
Delete Tops
Check Shot
Elog
Strata
The black curve on the rightmost
panel is the temporary corrected
sonic log. This is superimposed on
the input sonic log in red. The two
curves are supposed to match.
Set the check shot parameters in the
window below so the black line
matches the red when clicking Apply.
Click ‘Ok’ when done.
The corrections applied to the sonic
log are automatically applied to the
other logs when used in
combination.
You are getting prompted to save
the corrected sonic log. Accept the
suggested name by clicking Ok.
Suggested
values
Info
References
Check Shot Correction
Hampson-Russell
Geoview
Well Database
Load Logs
Load Tops
Delete Tops
Check Shot
Elog
Strata
Double click on the Well_1 icon to display the log suite. Shown below are the logs and
formations tops just added.
Top5 is top Cretaceous which shows up as a prominent reflector on the seismic record.
In the early stages of Tertiary, submarine fans were deposited and these
constitutes the main reservoir, which is located between Top4 and Top5. The sand
exhibits a Class II behavior. Above are mainly shaly formations.
Note that the Pimpedance log is nearly
constant trough the top
reservoir transition,
implying that the
reservoir zone should be
hard to identify on nearand full offset stack.
The elastic impedance log
is generated at 36,
corresponding to the
incidence angle for the
far offset stack. In
comparison, this log
suggests that the top
reservoir should show up
as a trough on the far
offset stack, which in
turn might be easier to
pick.
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