Chapter 11 - Fault Modeling

3D Geological Modeling

Chapter 11 – Fault Modeling

Fault Modeling Mode ling Generations of fault pillars, known as Key Pillars, are lines dening the slope and shape of the fault! "here are up to #e, #e, so call called ed $hap $hape e Points oints along along each each of these these line lines s to ad%ust the shape of the fault to perfectly &atch your input data! "he Key Pillars are generated 'ased on input data such as faul faultt su surf rfac aces es,, fault fault stic sticks ks,, faul faultt lines lines,, faul faultt poly polygo gons ns,, structural &aps, interpreted seis&ic lines, etc!

(n the pre#ious section, we did so&e editing on the input data to 'ring it to a for& suita'le to Petrel for 'uilding the 3D geological &odel! (n this section we will start 'uilding the &odel! "he 'uilding process &ay 'e deco&posed into the following steps)

• • • • • • • • • • • •

Dening a *ew Model! Creating Faults fro& Fault Polygons! +diting Key Pillars! uilding Key Pillars fro& Fault Polygons! Connecting Faults! Disconnecting Faults! Creating ranched and Crossing Faults! Creating Faults fro& $elected Fault $ticks! Creating Faults fro& -ll Fault $ticks! -uto&atic Generation of Faults! Faults! -uto&atic Connection of Faults! Faults! -nd -uto&atic -d%ust&ent of o f Key Pillars!

1

3D Geological Modeling

Chapter 11 – Fault Modeling

Defning a New Model efo efore 'ui uillding a 3D geologi ogical &odel in Petr etrel, it is nece necess ssar ary y to den dene e a &ode &odel! l! Petr etrel lets lets you you work work with with se#eral di.erent &odels in one session! (t is i&portant to den dene e the the di di.e .errent ent &ode &odels ls 'y gi gi#i #ing ng the& the& appr approp opri riat ate e na&es!

Creating a new model 1! Dou'le Dou'le click click on the the Defne Model ite& under the Structural Modeling in the Processes Pane ! /! - Dene Model dialog dialog 'o0 'o0 pops up, gi#e gi#e the &odel a specic na&e Top Tarbert Model and click OK. "he &odel will 'e placed under the Models Mo dels pane, as shown in Fig! 11!1!

Fig.11.1 "he Dene &odel dialog 'o0

2

3D Geological Modeling

Chapter 11 – Fault Modeling

Defning a New Model efo efore 'ui uillding a 3D geologi ogical &odel in Petr etrel, it is nece necess ssar ary y to den dene e a &ode &odel! l! Petr etrel lets lets you you work work with with se#eral di.erent &odels in one session! (t is i&portant to den dene e the the di di.e .errent ent &ode &odels ls 'y gi gi#i #ing ng the& the& appr approp opri riat ate e na&es!

Creating a new model 1! Dou'le Dou'le click click on the the Defne Model ite& under the Structural Modeling in the Processes Pane ! /! - Dene Model dialog dialog 'o0 'o0 pops up, gi#e gi#e the &odel a specic na&e Top Tarbert Model and click OK. "he &odel will 'e placed under the Models Mo dels pane, as shown in Fig! 11!1!

Fig.11.1 "he Dene &odel dialog 'o0

2

3D Geological Modeling

Chapter 11 – Fault Modeling

Fig.11.! "he Top Tarbert new &odel

-s you did 'efore, create another tow &odels and call the&, Top Ness Model and Top "ti#e Model! -s shown in Fig!11!3!

Fig.11.$ "he Top Tarbert, Top Ness and Top "ti#e new &odels 3

3D Geological Modeling

Chapter 11 – Fault Modeling

4

3D Geological Modeling

Chapter 11 – Fault Modeling

Creating Faults %rom Fault Pol&gons Fault polygons are line data representing the hangingwall and footwall for each hori2on! "he polygons could 'e separated into lines for each fault or lines for each hori2on! (n the latter case, the lines should 'e separated with ags to &ake sure that the sa&e line dose not denes two faults! (f there are no ags 'etween the line data, you should do so&e editing in the Make4+dit Polygons Polygons process in order to split the lines!

'ow to Create Faults %rom Fault Pol&gons 1! Go to to Structural Modeling ite& in the Processes Pane. /! -cti# -cti#ate ate the Fault Modeling process in the Processes Pane 'y clicking on it once and &aking it 'old! 3! Display Display one of the fault fault polygon polygon in the Top Tarbert Pol&gons folder in a 3D window e!g!  Pol&gon ((, as shown in Fig! 11!5!

5

3D Geological Modeling

Chapter 11 – Fault Modeling

Fig.11.) Fault Polygon displayed in a 3D window

6

3D Geological Modeling

Chapter 11 – Fault Modeling

5! (n the function 'ar, click on the Set Select*Pic+ Mode icons as shown 'elow! Notice the color of fault polygon 6purple7 changed to 6white7 after you selected 'y it as shown in Fig!11!8 6to do this step press S,i%t7! 8! $elect the desired fault geo&etry fro& the Fault Model 9ption "ools tool'ar! (n this case, a linear geometr& is suita'le! :! Click on the Create Faults %rom Fault Pol&gons  icon in the Function 'ar to generate Key Pillars along the selected polygons as shown in Fig!11!8! "he new fault has 'een added under the Faults folder in the Models Pane, and is called ;Fault 1