Receiver location in SEGD

Oil and natural gas exploration -- geology and geophysics
Post Reply
gfname
Member
Member
Posts: 4
Joined: Thu Dec 31, 2020 4:16 pm

Receiver location in SEGD

Post by gfname »

SEG-D standard https://seg.org/Portals/0/SEG/News%20an ... rev2.1.pdf (page 8) states that "Receiver positions are defined by a Receiver Line Number (three integer bytes and two fraction bytes), a Receiver Point Number (three bytes integer and two bytes fraction), and a Receiver Point Index (one byte). This index allows for defining the receiver group in the grid, the original value is 1 and that value is incremented by 1 every time the receiver is moved, even when it is moved back to the previous location". Similar statements are found for source position as well.

To me, a receiver position on surface is adequately defined by a line number and a point number. So what is a Receiver Point Index? How does it matter in positioning a receiver? Am I missing some concepts in seismic acquisition design?

Also, it seems there is no corresponding definition in SEG-Y.

Michael_Seman
Silver Member
Silver Member
Posts: 31
Joined: Fri Nov 24, 2017 4:36 am

Re: Receiver location in SEGD

Post by Michael_Seman »

If you only worked in the desert and the geophones were planted across a claypan and never disturbed, it may seem odd. But in transition zone survey, cables may be sloshed around by surf, so the receiver point index is used to indicate that the receiver is not in the same place it was yesterday. SPS files also allow for "receiver point index".

gfname
Member
Member
Posts: 4
Joined: Thu Dec 31, 2020 4:16 pm

Re: Receiver location in SEGD

Post by gfname »

Thanks for the explanations, Michael_Seman. It makes sense now.

AstridWilma
Member
Member
Posts: 1
Joined: Wed Mar 31, 2021 5:27 am

Re: Receiver location in SEGD

Post by AstridWilma »

Do you guys have a link to more info. I'd like this a little bit elaborated.

Post Reply
  • Similar Topics
    Replies
    Views
    Last post