bbal infile1 infile2 iopt infile1 = input file_1 name infile2 = input file_2 name iopt 0= profile mode iopt 1= trace modeExample that illustrates the concept is taken from down-hole data. There are two 3 component geophones, one at a depth of 19.39 meters, the other is a reference phone fixed at the surface elevation of the hammer.
----------------------------------------------------------------------------------- Length = 2500 samples | Shot Elevation = 820.0 Sample Interval = 0.00020 sec. | Shot Depth = 0.0 Delay Time = 0 msec. | Up Hole Time = 0 msec Low Cut Filter = 4 Hz. | Shot X-COORD = 9897.04 High Cut Filter = 1000 Hz. | Shot Y-COORD = 10066.29 Line ID: 18A_ | Shot Date (year.moday) = 1996.0604 Shot Orientation: | Shot Time (hr:min) = 10:52 Azimuth= 90 Deg. Vertical= 90 Deg.| Charge Size (grams)= 0 ----------------------------------------------------------------------------------- TRACE|SHOT| STATION | OFFSET| RECEIVER |VERT|1STBRK|K-GAIN|AZI|VER| # |REC.|SHOT REC| | ELEV. X-COORD Y-COORD|FOLD|(SEC.)| (dB) | | | -----|----|---------|-------|----------------------------|--|------|------|---|---| 1 | 10| 002 517| 19.39| 800.72 9897.04 10067.79|10|0.0000| 60 | 0| 0| 2 | 10| 002 518| 19.39| 800.72 9897.04 10067.79|10|0.0000| 60 |189| 90| 3 | 10| 002 519| 19.39| 800.72 9897.04 10067.79|10|0.0000| 60 |279| 90| 4 | 10| 002 520| 1.59| 819.96 9897.04 10064.70|10|0.0000| 20 | 0| 0| 5 | 10| 002 521| 1.59| 819.96 9897.04 10064.70|10|0.0000| 20 | 0| 90| 6 | 10| 002 522| 1.59| 819.96 9897.04 10064.70|10|0.0000| 20 |270| 90|The first 3 traces are separated to a new file, as are the last 3 traces. In this example, we then do a trace balance between the down-hole and the reference phone traces and recombine as in Figure 83. The commands are:
bplt c010.seg 2 0 0 1 7 0 .25 1 2e4 200 mv bplt.fig c010.fig bedt c010.seg 0 .5 1 3 1 0 mv bedtc010.seg down.seg bedt c010.seg 0 .5 4 6 1 0 mv bedtc010.seg refn.seg bbal down.seg refn.seg 1 cp bbaldown.seg BBAL.seg cat bbalrefn.seg >> BBAL.seg bplt BBAL.seg 2 0 0 1 7 0 .25 1 2e4 200 mv bplt.fig BBAL.fig
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