The hole is assumed to be vertical, reference phone fixed. This code is hardwired for how the author acquires data. Note the initial Channel order switch assumption choice at the beginning of the program execution. See Michaels (1998).
Output files are:
NOTE: change the permissions on geom, geom2, and
go1 files to executable. For example:
chmod +x geom
EXAMPLE RUN:
Down-hole VSP Pattern Generator For Setting Geometry Handles both Bison and SEG-2 File Formats Set Channel Order Switch 1=ascending 1,2,3=downhole 4,5,6=reference -1=descending 6,5,4=downhole 3,2,1=reference 2=ascending 1,2,3=down 4,5,6=ref,7=load_cell -2=descending 7=load_cell,6,5,4=down 3,2,1=ref 1 -----------BOREHOLE---------------------------- Enter 6 char. name for nez file (ex. STP001) STP001 Enter 4 char. LINEID 0001 Enter Z-Datum: Casing Elevation 849. BOREHOLE LOCATION: Borehole is origin of the local coordinate system Source and Reference phone locations are x,y relative to borehole. Following entries will shift every x,y input to a final global coordinate system: Enter Global x-coord. of borehole 1000 Enter Global y-coord. of borehole 1000 Enter number of sources 1 FOR THIS SOURCE: Enter Shot Record Names 8char: First STP30001 Enter Shot Record Names 8char: Last STP30100 STP30001STP30100 Enter Source: x, y, z_sub_CE (positive down) 0,-1,-.5 Enter Source Polarization: azi, ver 0, 180 -----------REFERENCE RECEIVER------------------ Enter Reference: x, y, z_sub_CE (positive down) 0,+1,-.4 Enter Reference Polarizations: R-azi, T-azi 0,270 -----------BOREHOLE PHONES--------------------- Enter Bulk Shift (Added To Geophone Depth ONLY) .3 For Shot: SP01 AZI= 0 VER=180 Enter Station Spacing: dz .25 Enter First Station Depth: zmax 20 Enter Last Station Depth: zmin 0.5 Number of receivers = 79 --------------------------------------------- CHECK DATA TYPE Files like XXXX0001 detected, ID=BISON Is above ID Correct, or overide needed? 1=YES correct 0=NO incorrect 1
In the above example, the tool has 6 channels, so there will be 6 lines for each down-hole station. The first 3 lines are the down-hole components, 2 horizontal, 1 vertical. The next 3 lines are the reference phone (note the elevation column does not change for the reference phone since it is stationary).