How can I created a layered result from many different input volumes merged at horizons?

Use volume maths with a series of nested “if” statements.

Any number of volumes can be merged this way, but it can be difficult to spot problems when using more than five. It is easier to work in separate sets (i.e. shallow set, middle set, and deeper set), then combine the shallow/middle/deep in a final process.

e.g. To merge 14 volumes (v1... v14) at horizons (h1... h14)

  • Merge volumes 1-5 in one process > “MergeShallow”
  • Merge volumes 6-10 in one process > “MergeMiddle”
  • Merge volumes 11-14 in one process > “MergeDeep”
  • Review each set of layers before combining.
  • Combine “MergeShallow”, “MergeMiddle”, “MergeDeep”

Merge 5 volumes at horizons e.g. "MergeShallow”

  • Given horizons:
    • h1, h2, h3, h4, h5
  • and volumes:
    • v1, v2, v3, v4, v5
if(twt_ms <h1, v1,   
	if(twt_ms<h2, v2,     
		if(twt_ms<h3, v3,       
			if(twt_ms<h4, v4, v5)    
		)   
	) 
)
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Repeat for the other sets. Merge these combined models using a similar approach.

Given horizons (from above):

  • h5, h10

and 3 combined volumes "MergeShallow", "MergeMiddle", "MergeDeep":

  • v1, v2, v3
if(twt_ms<h5, v1,   
	if(twt_ms<h10, v2, v3) 
)
Click to copy