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1. crossplots e Finally since the CrossPlot module works with trace headers only and doesn t need the actual traces we have truncated the traces to the 1 sample using the Trace Length module in order to save disk space and download time The results were saved to the demo3D_HeaderOnly dataset which will be used further in this manual When working with your own data you can omit the last step and specify an input dataset with full length traces for the CrossPlot module instead However this is a useful technique for speeding up the flows which work with headers only and do not require the actual data Crossplot processing flow Open the CrossPlotDemo project The main project window should look like this September 22 2014 DECO Geophysical SC www radexpro ru MB1 DbIClick Default action MB2 Context menu MB1 Drag flow to line to copy Three levels were created in the project database area area 1 survey survey 1 this is the level containing the dataset we ll be working with and processing flow for crossplots 010 CrossPlots for more detailed information about working with projects see the RadExPro User Manual and How to create new project tutorial Double click the processing flow name to open the editing window The flow is empty yet Help Options Database Tools Run Flow mode Exit Trace Output SEG Y Output RAMAC GPR AJIOTUC GSSI input Super Gather Text2. 32500 CDP_X X Y 41146 723 56164 1 7 To zoom into a map fragment select any rectangular area on the screen with the left mouse button hold down Ctrl while selecting to maintain the same X and Y scale when zooming in September 22 2014 DECO Geophysical SC__ www radexpro ru File Select View Zoom ajae Afm PUPPUC EPEC EP COCO UEC EC ECO POU EO EEE C EP EPEC ECE CU POPE CE EEE UCEE DEE ED OPE CED ODED OCPD ECDE OPPO CEE COP ED ETO COE CEP OEE DC CEOPUECE PD AEA ENAREN Ea pA A pa 20000 20250 20500 20750 21000 21250 21500 21750 22000 22250 22500 22750 23000 23250 23500 23750 CDP_X XY 23986 830 56900 181 Total fold and offset sampling maps Let us build a total fold map highlighting the CDPs in different colors depending on the fold value stored in the TR_FOLD header field To do this we ll first need to create a TR_FOLD histogram Open the CrossPlot Manager window press the New crossplot button check the Histogram field in the dialog box to indicate that you are going to create a histogram rather than a crossplot select the header to build the histogram from TR_FOLD and specify a reasonable number of histogram columns for example 30 First header X axis Second header Y axis TR_FOLD TRACENO Number of Columns 30 V Histogram Color a coa Press the Histogram Color button and select black as the histogram display color Press OK to close all dialog boxes and
3. Migration 2C Rotation Apparent Velocity Calculation Ensemble QC Stack QC The crossplot list is displayed on the left it is empty for now The control buttons are available on the right Seismic survey map We want to create a map showing the positions of shot points SP receiver points RP and common depth points CDP First let us build a CDP map Press the New Crossplot button and select the headers to be mapped on the crossplot axes in the dialog box In our case it is the CDP coordinates CDP_X and CDP Y September 22 2014 DECO Geophysical SC www radexpro ru First header X axis Second header Y axis cor x z z Number of Columns 100 Histogram C Column width 1 Point properties Lox ow Press the Point properties button and specify the crossplot point display parameters point radius 0 minimum possible radius since there are a lot of CDP points color green or any other color you like Press OK here and in the New CrossPlot dialog box The newly created crossplot will be displayed on the screen File Select View Zoom SUUEUURTEUERUIEROU TIERS UE TOOREEEIORSEOOROUROO UE EETEROCEI OCCT OTereer Tiere nierer rl ierinre eerie erren riers rerririirrrrrerrnri inne 21000 22000 23000 24000 25000 26000 27000 28000 29000 30000 31000 32000 33000 CDP_X XY 27495 170 57618 189 In addition the CDP_X vs CDP_Y crossplot will appear in the CrossPlot Ma
4. PRP EP EEE EP EE PEEP eee pee eee eee epee tap ea 20000 22500 25000 27500 30000 32500 CDP_X XY 24436 571 63471 938 The next step is to build an offset sampling map here offset sampling is the number of different offset bins in each CDP bin it is directly related to the appearance of footprints The offset sampling values are stored in the OFF_SMPL header Therefore we need to build a histogram from this header The procedure is the same as for the total fold histogram First header X axis Second header Y axis OFF_SMPL v TRACENO Number of Columns 20 V Histogram Color Lx co The resulting histogram is shown below 13 September 22 2014 DECO Geophysical SC __www radexpro ru File Select View Zoom ealo i Alel m T 5 i o o i w wn wo D 2 O a A c o D o Qo O g tA I deceelacecececetececcecacleccececectacacacecels S li rege 22 5 OFF_SMPL XY 10 985 4 823e 002 Let us make this histogram active and split it into intervals using the same parameters and the same palette terval 1 3 98571428571 terval 2 7 19142857143 terval 3 10 3971428571 nterval 4 13 6028571429 nterval 5 16 8085714286 nterval 6 20 0142857143 nterval 7 23 22 Nofdasses 7 Palette m CI Aty Cancel I Use linear intervals Manual Set 1 902 Use Margins This is how it loo
5. the shooting configuration map you can see that the CDPs are now colored according to their fold values 10 September 22 2014 DECO Geophysical SC __www radexpro ru File Select View Zoom o S O O O O E on lt J wn Oo T o o fn an E E a a e e E a E a a a O a a CE ET T v 2 T CLLERPREEEMALEP EPEC PL EPL EU RT ADAP PTTL TI ILLI EEO EtU 20000 22500 25000 27500 30000 32500 CDP_X XY 41146 723 56164 195 Finally we should disable the SPs and RPs which are no longer needed Open the Extra headers dialog box and uncheck the additional crossplots First header X axis Second header Y axis Point radius mee eco The result is shown below 11 September 22 2014 DECO Geophysical SC__ www radexpro ru x wlej z Al j g Terres E l CDP_Y SRR SER O CROP R TP Cee Tee eee POP ee ee eee eee eee eee ee ee ee 20000 22500 25000 27500 30000 32500 CDP_X X Y 24722 692 65963 189 YZ To get rid of the ripple pattern let us increase the CDP display size To do this open the View Point properties menu and specify the point radius of 1 Now the total fold map should look like this 12 September 22 2014 DECO Geophysical SC __www radexpro ru Select View Zoom oO oO oO oO A a O O O O O O S O O O A A n Sj wn T n on i T o M wn i T Ti OQ T CDP_Y PPeEE EP EEE
6. view the result the fold histogram September 22 2014 DECO Geophysical SC _ www radexpro ru File Select View Zoom alodo 22 All m aeoeetecens Frequency gt probability density S i Me iit TR_FOLD CDP_X vs CDP_Y TR_FOLD Histogram Now we need to split the histogram into ranges assign a color to each one and apply the resulting color scheme to the CDPs displayed on the previously created CDP_X vs CDP_Y crossplot To do this we ll first need to make the histogram active an active histogram or crossplot in the module defines the point display colors for all other crossplots Only one histogram crossplot can be active at any given time To make the fold histogram active press the A button on the histogram toolbar File Select Views EEA gt LE 30 0 TR_FOLD XY 17 212 1 386e 002 The Polygons Manager window will open on the right It contains the histogram interval list empty for now as well as the control buttons September 22 2014 DECO Geophysical SC__ www radexpro ru Now let us define the intervals This can be done manually one by one by pressing the New interval button and selecting the interval on the histogram with the mouse but in this case it will be more practical to use the automatic interval generation function To do this select the Select Auto add intervals menu command in the histogram window The automatic interval generatio
7. DECO GeophysicalSC www radexpro ru And this is how the SP map colored according to the signal to noise values looks File Select View Zoom Seo ee All LISTET LELLA DEP ORS R a hee eee ROR oo eee Se ae eh ee 22500 27500 30000 32500 25000 SOU_X X Y 25714 331 63755 482 E 18
8. Output Data Output Header lt gt Dataset Transfer Header Output Trace Header NMO NMI Compute Line Length Crooked Line 2D Binning 3D Gazer MB1 Drag module Ctri MB1 Copy module MB1 DbiClick Module Parameters MB2 Toggle module Ctrl MB2 DbIClick Delete Add the CrossPlot module to the flow it is located in the QC group in the module library on the right The asterisk after the module name means that it should be the only module in the flow with no data input or output modules Select the dataset containing the headers we ll be working with in the module parameter window area 1 survey 1 demo3D_HeaderOnly Now create a new database object crossplot collection This is where the module will store all crossplot settings between the runs We recommend creating the crossplot collection object at the same level as the flow within which you ll be working with the crossplot set Let us name the collection cp1 area 1 survey 1 010 CrossPlots cp1 The module parameter window should look like this September 22 2014 DECO Geophysical SC __www radexpro ru Get trace headers from Get trace headers from ASCII G survey 1 demo3D_HeaderOnly ene Ie ae Crossplot collection I survey 14010 CrossPlots cp First Reference Second Reference Header TRACENO TRACENO Help Options Database Tools Run Flow mode Exit CrossPlot lt area 1 survey 1 demo3D_HeaderOnly Advanced VSP Display 2D 3D VSP
9. September 22 2014 DECO Geophysical SC __www radexpro ru Working with crossplots in RadExPro seismic survey map fold and offset sampling maps and signal to noise ratio map In this manual we will discuss the mapping and QC attribute analysis features provided by the CrossPlot module of RadExPro software If you want to recreate all the steps described in this document on your own you should download the CrossPlotDemo project The project was specially designed for crossplot demonstration e Several auxiliary header fields which are absent by default were added to the project using the Database Edit header fields command OFF_SMPL AMP AMP_N SNR e 3D onshore seismic survey data were loaded into the project and had geometry assigned to them e The data were binned by CDP using the 3D CDP Binning tool e Fold and offset sampling values were computed using the Compute Fold module and saved to their respective headers TR_FOLD for the fold and OFF_SMBPL for offset sampling e The data were resorted to FFID OFFSET the RMS amplitudes of the useful signal and microseism were evaluated for each shot using the Ensemble QC module and were saved to their respective headers AMP for the useful signal and AMP_N for the microseism Their ratio was computed in the Trace Header Math module and saved to the SNR SNR AMP AMP_N field When using your own data you ll need to complete the above steps before you can start working with
10. er of Columns 100 m Histogram Column Width a Point properties Lc d om File Select View Zoom fair Oo ee Alm 32500 SOU_X X Y 25714 331 63755 482 4 Now let us create the signal to noise ratio histogram First header X axis Second header Y axis S fresco Number of Columns 100 MV Histogram Column Width fa gen Lo cwm 16 September 22 2014 DECO Geophysical SC_ _ www radexpro ru File Select View Zoom Gg D Ww Cc w kej D Fa oO OQ O as a A gt O C o w S Wu aTi Taaa Tinana ThAAA Annaga aaan aa Anpan AAAAANANAAAAAAAAAJAAAAA Aap aiT 8 9 10 11 12 13 14 15 16 Let us make it active and split it into intervals This time we ll use the default quantile based splitting as well as the default palette The number of intervals will be reduced to 5 Nofdasses 5 Palette j Apply Cancel I Use linear intervals Manual Set 0 817 7 Use Margins 15 201 The Quantile 1 interval will correspond to the lowest i e worst in our case 5 76 of the signal to noise values together with the Quantile 2 interval they will cover the worst 30 of the values together with the Quantile 3 interval the worst 70 of the values etc The split looks like this on the histogram Select View Zoom oj JTA m te i X 8 Frequency gt probability density 3 X Y 9 275 4 800e 003 17 September 22 2014
11. ks on the histogram Select View Zoom walo iA m S pe a oS a o il il I Frequency gt probability density rf 15 0 17 5 20 0 225 OFF_SMPL OLY 4 994 1 084e 003 And this is how the CDP_X vs CDP_Y crossplot looks now it is the offset sampling map 14 September 22 2014 DECO Geophysical SC_ __www radexpro ru x File Select View Zoom elo wm Af Me om on on Seeeeeaeatrteaeaerecarcan m O T CDP_Y PPeER EEE EE EP EEE EEE PEEP eee eee pee eee ep eee ep a 20000 22500 25000 27500 30000 32500 CDP_X XY 29248 596 57295 711 Now that we have two histograms each of which is split into intervals we can make them active alternately The colors on the CDP crossplot will correspond either to the total fold or to the offset sampling depending on the active histogram Signal to noise ratio map The SNR header field in our dataset contains the signal to noise values computed for each shot as the ratio of the RMS amplitude in the target reflection window AMP header to the RMS amplitude in the microseism window AMP_N header Let us build a map showing the areal distribution of the signal to noise values For this we ll first need to create a basis for such a map an SP crossplot Let us create the new SOU_X vs SOU_Y crossplot September 22 2014 DECO Geophysical SC_ __www radexpro ru First header X axis Second header Y axis oux 7 Numb
12. n dialog box will open September 22 2014 DECO Geophysical SC __www radexpro ru By default the software splits the histogram into intervals by quantiles corresponding to the Gaussian distribution However in this case linear splitting into intervals of the same length would be more convenient To do this check the Use linear intervals box at the bottom of the dialog box Press the Palette button to select the color palette for the intervals We suggest using the palette from the foldmap pal file located in the root directory of the CrossPlotDemo project Press Load palette in the palette editing window and select the foldmap pal containing the palette from the disk of course you can use any other palette edit this one or create your own After you specify the linear split method and select the palette the automatic interval generation dialog box should look like this nterval 1 5 07142857143 nterval 2 9 44285714286 nterval 3 13 8142857143 nterval 4 18 1857142857 nterval S 22 5571428571 nterval 6 26 9285714286 nterval 7 31 3 OK Any Cancel IV Use linear intervals ManualSet 2 23 Use Margins 29 77 The right limit values for each interval are listed on the right Press OK to view the intervals added to the histogram File Select View Zoom ia SAI Frequency gt probability density 20 0 5 30 0 TR_FOLD X Y 6 585 1 089e 002 Now let us switch to
13. nager list September 22 2014 DECO Geophysical SC __www radexpro ru Now let us add additional points corresponding to the SP and RP positions to this crossplot To do this select the View Extra headers menu item in the crossplot window This command allows adding any header pairs to the existing crossplot presuming that the measurement units and scale are the same but this something that should be taken care of by the user Select the headers containing the RP coordinates for the X and Y axis REC_X and REC_Y Select the point radius of 1 and blue point color and press Add The REC_X vs REC_Y crossplot will appear in the list of additional crossplots displayed in this dialog box First header X axis Second header Y axis Point radius a In a similar manner let us add an additional SP crossplot Select the SP coordinates SOU_X and SOU_Y for the axes point radius of 2 and red point color Press the Add button Now there should be two additional crossplots in the list First header X axis Second header Y axis Point radius Ol e E MIRE REC_X vs REC_Y Press OK to view the result September 22 2014 DECO Geophysical SC__ www radexpro ru Select View Zoom ee XY 24017 422 61643 117 A You can press the 1 1 button on the toolbar to display the entire map on the same X and Y scale File Select View Zoom eee OO ee Oe ee OOOO ee eee eee eee Cee 20000 22500 25000 27500 30000
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