--> Abstract: Pitfalls in Prestack Inversion of Merged Seismic Surveys, by Sumit Verma; #90200 (2014)
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Pitfalls in Prestack Previous HitInversionNext Hit of Merged Previous HitSeismicNext Hit Surveys

Sumit Verma
University of Oklahoma

Abstract

Modern 3D Previous HitseismicNext Hit surveys are often of such good quality and 3D interpretation packages so user-friendly that Previous HitseismicNext Hit interpretation is no longer exclusively carried out by geophysicists. This ease-of-use has also been extended to more quantitative workflows, such as 3D prestack Previous HitinversionNext Hit, putting it in the hands on the "non-expert" – be it geologist, engineer, or new-hire geophysicist. Indeed, given good quality input Previous HitseismicNext Hit Previous HitdataNext Hit, almost any interpreter who can generate good well ties and define an accurate background model, can generate a quality prestack Previous HitinversionNext Hit. Here we, the two new geophysicists acted as non-experts and followed the convenient path of Previous HitseismicNext Hit Previous HitinversionNext Hit of a merged Previous HitdataNext Hit set and fell into the Previous HitinversionNext Hit "pit". Specifically, we applied prestack Previous HitinversionNext Hit to gathers that were carefully reprocessed by a major service company. The problem was not with the processing, but with our lack of understanding of the input legacy Previous HitdataNext Hit that formed part of a larger "megamerge" survey. Specifically, the Previous HitdataNext Hit were migrated to accommodate the longest offsets corresponding to the most recently acquired Previous HitdataNext Hit, while older input surveys were acquired using much shorter offsets. The replacement of acquisition offsets with prestack migration offsets formed the grass mat covering the pit, and in we fell. In this presentation I will share our initial workflow and suspicious results. In addition to presenting some QC tools useful in analyzing megamerge surveys, I will show how by limiting the offsets used in our prestack Previous HitinversionTop that we obtain less aggressive, but still useful results.

AAPG Search and Discovery Article #90200 © AAPG Geoscience Technology Workshop, Fifth Annual AAPG-SPE Deepwater Reservoir, January 28-29, 2014, Houston, Texas