January 9, 2003

Note: Homework assignment at the end. Due January 16th at start of class.

GeoGraphix Introduction

Codes:

PDW = Pull Down Window

> = Sub-window option

-> = Enter text or value

* = Set option

+ = Select option

(OK), (Open), (Finish) = Click OK, Open, Finish, etc.

Create Project:

To start, double-click "GeoGraphix Discovery" icon.

Click on (New Project), the first icon on the ProjectExplorer tool bar.

-> YourFirstName for new project name. (Next >).

(Next >) to create your project in Projects Folder.

Open North America > Canada Folder. For System: + Geographic Latitude/Longitude.

For Datum: +NAD 1927-North America Datum of 1927 Mean. For Area: +Canada,

Central America, or Mexico. (Next >).

Re enter for System: +Universal Transverse Mercator. For Zone: +11: 120W-114W

North. (Next >).

Accept defaults and (Finish).

 

Load Well Data:

Well Headers:

PDW File > Imports >Well > +GeoGraphix ASCII2 Import…

(Yes). (Browse). Find C:\Documents and Settings\All Users\Application Data

\GeoGraphix\SampleFiles\Moosehead\Wellbase\Moosehead.wls. Select and (Open).

(Next >).

Accept defaults. (Finish).

Well Logs:

PDW File > Imports > LogCurve > +LAS\LBS Import…

Find C:\Documents and Settings\All Users\Application Data\GeoGraphix\

SampleFiles\Moosehead\Welllogs. +WELL_1.LBS. Hold down shift key and

also select +WELL_3.LBS. (Open). Accept defaults. (Finish).

Start SeisVision:

Click on SeisVision icon on right hand side of window or on an existing interpretation.

+2D/3D. (OK)

PDW File > Discuss New Interpretation, Old Interpretation, Open Quick Map, Exit

PDW Help > SeisVision Index

>Index: Type in keyword -> Horizon. (Display)

+Desired Topic, (Display)

>Search: Type in word to search for ->filter. (List Topics)

+Desired Topic, (Display)

Close window.

PDW File > New Interpretation->YourName1. Note file paths. (OK). Move Faults and

Horizons windows out of the way.

PDW Interpretation > Settings ->YourName. * Meters. ->500 in Datum Elevation.

->2300 in Replacement Velocity. *Activate Auto save interval. ->10 min.

(Map Coordinate System…). This is where you would select map projection. Defaults

must show Zone 11. (OK)

>Color Control. Here you select color palates and active interpretation colors. Lime green

is hard to see, so lets switch the active colors to pink.

>Seismic Views. Here you select horizon to flatten on, scroll increments for 3D data,

display annotations, scale settings and trace display options.

*Wiggle trace on. *Color trace off. (OK)

Add Seismic Line:

PDW Seismic >2D Seismic Data Manager > Programs: (Add) -> Moosehead (OK)

>Lines: (Add…) > (Add… ) > C:\Documents and Settings\All Users\

Application Data\GeoGraphix\Sample Files\Moosehead\2D_lines\

2ds\MHD-101 (Open). (Next >).

*Same XY Coordinates as Interpretation. (Finish)

Close window

Discuss Seis. Selection Buttons: N-E, E-W, Arbitrary, Timeslice, 2D Line, Jump Tie, 2D/3D

Composite. Show horizons, Show faults, Show wells, Zoom display, Unzoom, Zoom to

full extent, and Pan display.

(Open 2D Seismic). (on MHD-101). Move seismic window off map.

Scroll bars. On bottom CMP, SP, Time, Amplitude. Cursor on map/seismic.

To zoom seismic, move cursor to data, click mouse right hand button, >Display Tools

>Zoom. Drag a zoom box with mouse while holding left-hand button. To return to

original scale: Display Tools >Unzoom. Same as using Zoom/Unzoom buttons.

To adjust seismic, move cursor to data, click mouse right hand button, >Adjust Seismic

Display. Here is same Seismic Views window seen before. >Scale Settings.

traces/cm -> 5. cm/sec -> 40. (OK)

Add Horizon:

PDW Horizons > Horizon Manager…

(Add). ->Temp1 in Horizon name. ->Temp1 in Symbol. Discuss Depth conversion opt.

(OK).

Click on "Peak" of Temp1. Scroll down to Trough. Click on color dot of Temp1. Pick an

orange color.

>Auto Track. Discuss Picking Constraints, Inversion Picking, Correlation Tracking.

(Close)

In the Horizons window, +Temp1, and click on (Drag picking mode).

Find a trough on seismic, click, drag, and release. Continue interpreting and

scrolling to edge of seismic. Mistakes can be undone using PDW Edit >Undo.

Look at base map for colored time interpretation. It would be rainbow colored if it weren’t

highlighted in red. Return to seismic window.

Zoom in to small part of seismic containing interpretation.

To edit bad autopicks: Right-click on the horizon > Pick Parameters, *None, (OK).

Click, drag, release where you want the edit.

Interpret 3 Horizons:

On the seismic data, right-click > Adjust Seismic Display >Scale Settings > Traces/cm ->

10 tr/cm. Cm/sec -> 20. (OK)

Right-click on horizon > Pick Parameters, *Trough, *2D Autopick, (OK)

Scroll to top of seismic.

Pick trough @ SP 130 at .295 sec. Note cycle skips. Pick at SP 120 at .295 sec. Note

different interpretation. Autopicking can cause major problems on noisy data.

Take 10 minutes for this:

PDW Horizons >Horizon Manager >(Add…)

Add 3 horizons: Wab Group, Fort Vermilion, and F4. Symbols should be Wab, Ft.

Vermilion, and F4. Make Wab and F4 peaks, and Ft. Vermilion a trough. Wab

should be yellow, Ft. Vermilion should be vermilion, and F4 is your choice.

Interpret Wab beginning @ SP 140 and time=.516.

Interpret Ft. Vermilion beginning @ SP 140 and time=1.030.

Interpret F4 beginning @ SP 140 and time=.744.

Manually edit horizons, especially right ends of Ft. Vermilion and F4.

Load Cultural Data:

Start at base map. PDW Interpretation >Show Interpretation Manager >

Culture (Load…) (Browse…). Locate C:\Documents and Settings\All Users\

Application Data\GeoGraphix\Sample Files\Moosehead\

Culture\TRGRID.ASC. (Open). (Load).

Close window. Note section lines on map.

Load Remaining Three 2-D Lines:

PDW Seismic >2d Seismic Data Manager. +Moosehead. >Lines: (Add…) >(Add… ). Locate

C:\Documents and Settings\All Users\Application Data\GeoGraphix\Sample Files\

Moosehead\2D_lines\2ds\LBT-201 (Open).

(Add…). +MHD-102. (Open).

(Add…). +MHD-103. (Open). (Next>).

*Same XY Coordinates as Interpretation. (Finish).

Close window.

Pick Multi-Line Seismic Traverse:

(Zoom) to intersection of all lines.

(Build a 2D/3D Composite Line). (Open a 2D Seismic Line). Using the mouse, click and drag

along first seismic line to intersection with second line. Release button. Move mouse to

intersecting line. Click and drag along second line to second intersection and release

button again. Repeat to get all seismic lines on one composite line. PDW Seismic >Open

Composite Window.

Suggestion: start with MHD-102, then go west on MHD-103, then

north on MHD-101, then southeast on LBT-201.

Notice gain and bulk shift problems. These must be resolved.

Resolve Seismic Data Misties with Bulk Shifts, Phase Shifts, and Amplitude:

Right-click >Adjust Seismic Section > Scale Settings > *Trace-to-trace Scaling. (Save as

Default). (OK).

Tie all seismic lines to MHD-101.

On MHD-103 Right-click > Survey Properties… > Static Shift -> -5. (OK).

On MHD-102 Right-click > Survey Properties… > Static Shift -> -2. (OK).

On LBT-201 Right-click > Survey Properties… > Static Shift -> -17. (OK).

This tie seems close, but is still not correct. Look at peak on MHD-101 @ .850

seconds. It is the strongest event for +/- 100 ms. On LBT-201, there is a strong

trough at .861. It is the strongest event for +/- 100 ms as well. It looks like LBT-

201 is 180 degrees out of phase from MHD-101. Try phase shift and then another

bulk shift. On LBT-201 Right-click > Survey Properties… > Phase Shift -> 180.

(OK).

Now check tie again. An additional bulk shift will tie these lines.

On LBT-201 Right-click > Survey Properties… > Static Shift -> -28. (OK).

Extend Interpretations from Line MHD-101 to other three seismic lines.

Re-examine Basemap Display.

 

Homework due at start of next class:

1). Interpret Wab, Ft. Vermilion, and F4 horizons on all 4 seismic lines. Manually edit horizons

to be geologically reasonable (smoother). Hand in printout.

2). Create a composite line containing all 4 seismic lines on 1 printout showing line ties and

interpreted horizons. Hand in printout.

3). Create a contour map of one horizon. Select the horizon in the Horizons window. To the left

the map, there are 4 buttons, Contoured Surface, Shaded Surface, Color Bitmap Surface,

and Ribbon Map. Click (Contoured Surface). An inch above this button, there is a button

that looks like a rectangle with a C below the lower right hand corner. Click this button

(Create Custom Grid Rectangle). Click, drag, and release a box on the map and

containing all 4 seismic lines. Each new map will have the name Custom Grid, ID # ##.

(OK). Hand in a printout.

You can erase a map by: PDW Interpretation >Show Interpretation Manager >Custom

Grid. Select Custom Grid, ID # ##. (Remove…). (OK). Close window.

Experiment with various contour options.