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| Figure 1. Integrated seismic/well depth map for top of Mississippian Limestone formation in SE Kansas. (a) Horizon time structure map t(x,y) from 3D seismic data (2 ms contours). (b) Contoured average velocity map v(x,y) from seismic datum to top Miss using 4 wells (10 ft/s contours). (c) Depth map created by grid math z(x,y) = v(x,y)•t(x,y)/2 then corrected for seismic data to subsea depth (10 ft contours). |
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| Figure 2. Geobody extraction for gas bright spot in the North Sea. (a) Vertical seismic line from 3D survey showing bright spot amplitudes. (b) Connected area amplitude threshold geobody grown from a single seed. (c) Map view of geobody colored blue and seed point in red. (d) Map view of geobody colored by z values with shallow points red and deeper portions yellow to gray. |
Back to work....
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7 September 2014
As some of you know, I am revising my book Elements of 3D Seismology for a 3rd edition to be published by SEG. My method, after much consideration, has been to mark up the printed 2nd edition version by hand, then I will edit the doc files and push them off to SEG for later work.
The 2nd edition has 557 pages, not counting the bibliography. Right now I am on p333. I think it was Samuel Johnson who said "A man can turn over a small library to make one good book", and I know what he means. Here is a photo of p73 with my hand edits. Going through my ~80 book geophysical library I find much confusion about Fresnel zone, mainly uncertainty about whether the author is talking about diameter or radius of the zone. Wiggle words like 'width', 'size', and 'dimension', don't help. I'm sticking with 'radius' in the 3rd edition...
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| Elements of 3D Seismology 3rd edition (revision in progress, p73 of 557). |
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| Here is the 'yellow pad' version of part of p73 that will be in the 3rd edition. |