course 7: utilities and integration. digitize log program

Course 7: utilities and integration

Digitize log program

Define curve type

Wavelet Editor amplitude freq and phase can be edited separately save reference points wihcu

Change spectrum to observe influence on wavelet

Selecting the required omponend icon allows you to do the editing

Batch Manager schedule and run processes later

Fill Patterns create your own patterns

Previous the pattern you develop

Rebuild work area list: creates a new work area .lst file usually created auto when well is imported

Project mode control: probably will not use since no standalone keys

Log M Integration

Switch to project mode: DC Utilities > Project Mode Control (from the drop down list) > Launch

Yes to switch

Wells transferred from discovery to logM

Click on the file menu in the logM well editor

Select buld transfer collowed by > from Discovery to logM workspace

Transfer from disc to logM

File > Bulk transfer > fr0m Log M Workspace

Trnasferred into discovery workspace and associated with UWI and API logs velocity etc can be transferred back to Discovery

You can send wells from logM well editor or model builder >

Click on well spots

On cross section window select well-to well

Click on wells then click in blan area to initiate the model builder

Change to projected mode

Use to immediately generate 2d trace models in the model builder

Top of the madison group with many wells note producing wells in highs and lows

Need stratigraphic modeling

Madison and Torquay horizons picked in seisvision are displayed in the logM Well editor

Note the mismatch using logm time alignment, stretch squeeze we can do much better

Synthetic is giving a much stronger peak in the Bakken

Wavelet phase and freq must match that in the data. We will use the wavelet extraction shaping filter to obtain a much better match

Use fluid substitution model

Original synthetic

Note the presence of slight peak in the synthetic with oil as the pore fluid

Next we will examine the influence of water versions of the sonic and density with the extracted wavelet. Note that this peak disappears.

Now wel will attempt to quant results with 2D strat modeling

water oil water

We will thicken the oil sand. Launch the middle well in the logm well editor We will use the multicurve stretch squeeze function to thicken the Bakken sand by about 5 meters

We can now conclude that both oil (rather than water in the zone) and thickening of the oil zone produce increased amplitude

Save back to cross section > auto updated > now out of sync> RMB on traces > regenerate traces

Use view model in seisvision we can have the trace model show up in a second vertical trace window

We can use the create correlation polygon option from the pop-up menu to overlay the thickened Bakken sand on other various locations on our seismic to attempt to discover other prospective drilling locations

Notice the southwest to northeast thickening of the Madison to Torquay interval > open arbitrary line

Shows the peak of the Bakken sand over it’s extend across the field >2D models > high am best oil targets