## grid in geophysics

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RaSaaLa
Silver Member
Posts: 14
Joined: Tue Aug 18, 2020 8:02 am

### grid in geophysics

Hello guys,
What does a grid mean in geophysics?
And a grid point? Is this the same thing?
What does "the subsurface model is gridded" and what is exactly a grid model?
What is also a grid size?

What do midpoint and offset aperture mean?
Is this the same thing as migration aperture?
Is this like a "limit" you use to do a search?

geophix
VIP Member
Posts: 941
Joined: Fri Jul 24, 2009 9:26 am

### Re: grid in geophysics

In geophysics, a model space can be divided into a number small "boxes". Each box shares boundaries with adjacent boxes. Fore example, in 2D you can divide the model into rectangular shape boxes using parallel lines in box X and Y directions. Now you can see the "grid" formed by the dividing lines. A grid point can be a box, or a corner of a box, depending on the context or the modeling method.

RaSaaLa
Silver Member
Posts: 14
Joined: Tue Aug 18, 2020 8:02 am

### Re: grid in geophysics

Is the grid like a area of a model?
In seismic modelling, you have to create a model and then grid it. So you will get a gridded model?
I did not understand what the gridded model is in 2D.

GuyM
VIP Member
Posts: 656
Joined: Sat Mar 24, 2012 11:35 pm

### Re: grid in geophysics

A surface in a sub-surface modelling package can be multi-valued; like the top of a salt dome, that can bend over. Or a thrut fault.
By multi-valued, I mean that at give X,Y coordinates the surface is present in the model more than once.

With a grid, you have an z, y and z value. There's only one z value for any give X,Y location. It cannot be multi valued.

this creates a few headaches when modelling these "multi-valued" surfaces, and then assigning rock properties to the model.

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