Course 4: Using AdvancedWell Editor Tools. Log curves are resampled

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