Converting Bison Files to BSEGY Format and Setting Geometry

The conversion and geometry setting begins with program genvsp. Change to the directory with the Bison files. From the command line, run the interactive geometry setting program, genvsp by typing:


genvsp


The following is the dialog between the program and user (user response boxed).

 |---------------------------------|
 | Copyright (C) 2017  P. Michaels |
 |       All rights reserved       |
 |see GNU General Public License   |
 |---------------------------------|

  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)
logn01
Enter 4 char. LINEID

0001
Enter Z-Datum: Casing Elevation

1.025
   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
100.0
Enter Global y-coord. of borehole

100.0
Enter number of sources

2
 FOR THIS SOURCE:
   Enter Shot Record Names 8char: First
LOGN0001
Enter Shot Record Names 8char: Last

LOGN0145
     LOGN0001LOGN0145
   Enter Source: x, y, z_sub_CE (positive down)
0., 1.27, 1.025
Enter Source Polarization: azi, ver

90, 135
 FOR THIS SOURCE:
   Enter Shot Record Names 8char: First
LOGN0002
Enter Shot Record Names 8char: Last

LOGN0146
     LOGN0002LOGN0146
   Enter Source: x, y, z_sub_CE (positive down)
0., 1.27, 1.025
Enter Source Polarization: azi, ver

270, 135
 -----------REFERENCE RECEIVER------------------
   Enter Reference: x, y, z_sub_CE (positive down)
0., 2.17, 1.175
Enter Reference Polarizations: R-azi, T-azi

0, 270
 -----------BOREHOLE PHONES---------------------
   Enter Bulk Shift (Added To Geophone Depth ONLY)
0.
For Shot: SP01 AZI= 90 VER=135

Enter Station Spacing: dz
.25
Enter First Station Depth: zmax

19.25
Enter Last Station Depth: zmin

1.25
For Shot: SP02 AZI=270 VER=135

Enter Station Spacing: dz
.25
Enter First Station Depth: zmax

19.25
Enter Last Station Depth: zmin

1.25
  Number of receivers =    73
---------------------------------------------
  CHECK DATA TYPE

  Files like XXXX0001 detected, ID=BISON
  Is above ID Correct, or overide needed?
  1=YES correct    0=NO incorrect
1
  Number of receivers =    73
---------------------------------------------
  CHECK DATA TYPE

  Files like XXXX0001 detected, ID=BISON
  Is above ID Correct, or overide needed?
  1=YES correct    0=NO incorrect
1

The above dialog between the program and user creates the following files:

You will need to change permissions to execute (files geom, geom2, go1). Conversion from Bison to BSEGY and the setting of geometry is done by:

  1. Run geom   creates files LOGN0001.xyz to LOGN0146.xyz which contain geometry
  2. Run geom2   creates files L001.seg to L0146.seg which are in BSEGY format.



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