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1、Synthetic SeismogramObjectives,Make Well Section Quality check and edit logs Create an Estimated log Import Check shots Correct sonic log and establish Time-Depth relation Make Acoustic Impedance log and Reflection Coefficient Series Generate Synthetic and Extracted Wavelets Produce Synthetic Seismo
2、gram Compare seismogram with real well seismic Manual adjustment and event picking Display of synthetic trace in 3D window,Make well section,Select New well section window from the Window menu,Expand the Wells folder and select the appropriate wells,1,2,Color fill logs by using the Create/edit curve
3、 fill tool,3,Expand the Global well logs folder and select the available logs to use,4,Process overview,1.Select wells,1,2.Sonic correction,3.Time/Depth lookup,4.AI log and RC series,5.Generate Wavelet,6.Synthetic Seismogram,7.Correlate Seismic,2,3,4,5,6,7,Log input and QC,Input data to Synthetics;L
4、ogs:Sonic s/ftDensity gr/cm3Check shots(CS):Check Shot Survey(or)VSPAdditional logs(optional):GR APICaliper Hole diameterAny other,1,2,Bad logs must be edited Estimate logs if missing Splice log intervals Manual editing,Log editing,From Global well logs Right click on DT and select Calculator,1,2,GR
5、,Sonic,5,Make expression Sonic_despiked=DTUse sonic as templateSample MD from log and select DT as inputClick Enter,Log editing-Despike,1,2,3,4,5,Change Action#1 to DespikeUse default parametersRun and view the result in well sectionUndo and adjust parameters if not satisfied,From Global well logs R
6、ight click on Sonic_despiked and select Log editor,Log estimation Make density from sonic,1,2,3,4,5,Click on Use existing,select Global Well Log from the listSet Action#1 to Density from SonicSelect Input LogApply default parameters,Right click on the well where an estimated log should be generated,
7、Double click on the Synthetics process under Stratigraphic modeling,Process diagram,2,Move the mouse over each of the different icons to see hints on how to use them,Select wells to work with and a well section to display any results in,3,Select a single well or the Wells folder to work with from th
8、e drop down menu,Well selection,2,Working with one well only deactivates the Wells tab selection,Clicking None in the Wells tab,activates the separate well selection list,3,1,Load checkshots,1,2,3,4,Make sure Files of type is correct,Right click on Wells folder and use Import(on selection),Select fi
9、le(s)to import,Access the files by clicking Open,Load checkshots,1,2,3,B,Right click on checkshots to open the spreadsheet,Fit input parameters(A)to file(B),A,5,4,6,Connect to welltrace,Correct data(if needed),OK(one file)or OK For All(two or more files if in same format),Change depth from MD to TVD
10、.Compare TVD and TWT with input file(s)and other time/depth information,Sonic correction,Do the Sonic correction based on original sonic and check shots,Check Shot Survey,Sonic Log,T.D.R.,Use the generated corrected sonic as input in the process,1,2,Well time/depth relation,1,2,Well TDR is defined b
11、y generating global time log(s),Click on Shared checkshots,select and drop in a source well from the Well filter of a checkshots item.Execute,3,5,4,Open Settings for Global time.,Rearrange the priority list using the blue up/down arrows.Mark(green tick)objects to select from,Click on Execute to gene
12、rate the global time log,2,In the Seismogram tab,click on Create synthetic seismogram,Acoustic impedance and Reflection coefficient series,6,Select Density to use,Click on create new object icon to generate an Acoustic impedance log.Settings opens for selection,Select density and sonic log onput,Fro
13、m the Acoustic impedance pull down menu,select the newly created log,Click on the Create new object icon for Reflection Coefficients.Select AI log for input and use the new log as input for RC,1,2,3,5,4,Select Synthetic type of seismogram,Synthetic wavelet,2,Wavelet shape,Phase,Amplitude,Ricker,Orms
14、by,Klauder,Butterworth,4,3,3,Create new object for Wavelet.Open Settings for it,Select which Synthetic wavelet to use,Set parameters dependent on the selected Synthetic,1,Extracted wavelet,1,Wavelet shape,Phase,Amplitude,3a,4,2,Bartlett,Papoulis,Hamming,Cosine,Hanning,4,Alternative type of seismogra
15、m is loaded from file,5,7,6,3b,Select Extracted type of seismogram,a)Set Neighborhood extent for 3D seismic b)If 2D lines are used,set number of traces,From Input pane,select seismic data and Well.Drop both ino the dialog box using the drop in arrows,Select Taper window type,Import the file in the I
16、nput pane and open it in the dialog box,Set Time unit,Click on the Synthetic seismogram pull down menu to view its content,Synthetic seismogram,2,1,Signal:S=R*Wavelet,*,=,Reflection coefficients and wavelet is input when Apply or OK is clicked,a)Select which extraction method to use,Radial or Orbita
17、l(3D)b)Set number of traces to use along seismic line(2D),Well seismic extraction,1,4,3a,3b,From the input pane,click on the seismic data object and drop it in using the drop in arrow,In the Well seismic tab,check the Create well seismic box,Set appropiate parameters for method chosen.,2,After gener
18、ation of the synthetic seismogram,open Settings from the Shynthetics process dialog boxOpen Synthetic seismogram tab and set Number of traces to 3.Set Peak frequency Action to Sequence and type in 20 25 30.Apply and view the result in the well sectionOpen the 2D Style tab and select Show wiggles.Fil
19、l in the preferred parameters,Synthetic seismogram settings,1,3,2,From the Input pane,right click on the Synthetics folder and select spreadsheetFilter on a single well and set the Domain to work in(e.g.TWT)Specify Step and Use limit Min.and Max.to filter the spreadsheet,Synthetic seismogram spreads
20、heet,1,3,2,Color fill the spreadsheet for visual aid to identify features not easily seen,4,Under the Sonic and time tab,with Overide global time log(s)active,check the Manual adjustment box,Manual adjustment,1,3,2,4,Open the Well tops spreadsheet,Updated TWT Picked values can be entered.Click Apply
21、 in the spreadsheet to store the manually entered values,Applying the manual adjustment in the Synthetics process will update the TWT auto values to fit the TWT picked values,Manual adjustment,5,6,7,Undo the Manual adjustment,Create/edit well tops,Show well top time,Edit well top time,8,To edit well
22、 tops in time,click and move the well top line to a desired position.The TWT picked value in the Well top spreadsheet will update accordingly,In the Well section find a well top which needs adjustment,Activate the Edit well top time from the icon bar to the right,Apply the Manual adjustment and obse
23、rve the effect in the Well section,3D display,2,3,Since a time/depth relationship is established in some wells,Synthetics and Extracted seismic can be displayed in both time and depth,2,1,Open up an existing 3D window and display seismic lines together with wells,well tops,logs,synthetics and extracted seismic,Change time/depth settings to TWT.Alternate between TWT and TVD,EXERCISE Synthetic Seismogram,
