Petrel官方地震解釋培訓(xùn)M4_Well_Ties_Synth

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 windowMake well section Select New well section window from the Window menu Expand the Wells folder and select the appropriate wells12 Color fill logs by using the Create/edit curve fi

3、ll tool3 Expand the Global well logs folder and select the available logs to use4Process overview 1. Select wells12. Sonic correction3. Time/Depth lookup4. AI log and RC series5. Generate Wavelet6. Synthetic Seismogram7. Correlate Seismic234567Log input and QC Input data to Synthetics;Logs:Sonic s/f

4、tDensity gr/cm3Check shots (CS):Check Shot Survey (or)VSPAdditional logs (optional):GR APICaliper Hole diameterAny other12GRSonicDensityCaliperCS Bad logs must be edited Estimate logs if missing Splice log intervals Manual editingLog editing From Global well logs Right click on DT and select Calcula

5、tor12GRSonic54 Make expression Sonic_despiked=DT Use sonic as template Sample MD from log and select DT as input Click Enter3Log editing - Despike12345 Change Action #1 to Despike Use default parameters Run and view the result in well section Undo and adjust parameters if not satisfied From Global w

6、ell logs Right click on Sonic_despiked and select Log editorSonicDespikedLog estimation Make density from sonic12345 Click on Use existing, select Global Well Log from the list Set Action #1 to Density from Sonic Select Input Log Apply default parameters Right click on the well where an estimated lo

7、g should be generatedSonicEst.density Double click on the Synthetics process under Stratigraphic modelingProcess diagram2 Move the mouse over each of the different icons to see hints on how to use them 1Opens settings page for the objectCreate a new objectOpens the spreadsheet for the object Select

8、wells to work with and a well section to display any results in3 Select a single well or the Wells folder to work with from the drop down menuWell selection2 Working with one well only deactivates the Wells tab selection Clicking None in the Wells tab, activates the separate well selection list31Loa

9、d checkshots1234 Make sure Files of type is correct Right click on Wells folder and use Import (on selection) Select file(s) to import Access the files by clicking OpenLoad checkshots123B Right click on checkshots to open the spreadsheet Fit input parameters (A) to file (B)A546 Connect to welltrace

10、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. Compare TVD and TWT with input file(s) and other time/depth informationSonic correction Do the Sonic correction based on original sonic and check shotsDepthTimeCheck Shot SurveySon

11、ic LogT.D.R. Use the generated corrected sonic as input in the process12Well time/depth relation12 Well TDR is defined by generating global time log(s) Click on Shared checkshots, select and drop in a source well from the Well filter of a checkshots item. Execute354 Open Settings for Global time. Re

12、arrange the priority list using the blue up/down arrows. Mark (green tick) objects to select from Click on Execute to generate the global time log2 In the Seismogram tab, click on Create synthetic seismogramAcoustic impedance and Reflection coefficient series6 Select Density to use Click on create n

13、ew object icon to generate an Acoustic impedance log. Settings opens for selection Select density and sonic log onput From 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

14、as input for RC12354 Select Synthetic type of seismogramSynthetic wavelet2Wavelet shapePhaseAmplitudeRickerOrmsbyKlauderButterworth433 Create new object for Wavelet. Open Settings for it Select which Synthetic wavelet to use Set parameters dependent on the selected Synthetic1Extracted wavelet1Wavele

15、t shapePhaseAmplitude3a42BartlettPapoulisHammingCosineHanning4 Alternative type of seismogram is loaded from file5763b 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

16、ino the dialog box using the drop in arrows Select Taper window type Import the file in the Input pane and open it in the dialog box Set Time unit Click on the Synthetic seismogram pull down menu to view its contentSynthetic seismogram21Signal:S=R*Wavelet*= Reflection coefficients and wavelet is inp

17、ut when Apply or OK is clicked a) Select which extraction method to use, Radial or Orbital (3D) b) Set number of traces to use along seismic line (2D)Well seismic extraction143a3b From the input pane, click on the seismic data object and drop it in using the drop in arrow In the Well seismic tab, ch

18、eck the Create well seismic box Set appropiate parameters for method chosen. 2 After generation of the synthetic seismogram, open Settings from the Shynthetics process dialog box Open Synthetic seismogram tab and set Number of traces to 3. Set Peak frequency Action to Sequence and type in 20 25 30.

19、Apply and view the result in the well section Open the 2D Style tab and select Show wiggles. Fill in the preferred parametersSynthetic seismogram settings132 From the Input pane, right click on the Synthetics folder and select spreadsheet Filter on a single well and set the Domain to work in (e.g. T

20、WT) Specify Step and Use limit Min. and Max. to filter the spreadsheetSynthetic seismogram spreadsheet132 Color fill the spreadsheet for visual aid to identify features not easily seen4 Under the Sonic and time tab, with Overide global time log(s) active, check the Manual adjustment boxManual adjust

21、ment1324 Open the Well tops spreadsheet Updated TWT Picked values can be entered. Click Apply 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 valuesManual adjustment567 Undo the Manual adjustmentCreate/edit well topsShow well top timeEdit well top time8To edit we