Imaging complex structure in shallow seismic-reflection data using prestack depth migration

被引：23

作者：

Bradford, John H. ^{[1
]}

Liberty, Lee M. ^{[1
]}

Lyle, Mitch W. ^{[1
]}

Clement, William P. ^{[1
]}

Hess, Scott ^{[1
]}

机构：

[1] Boise State Univ, Boise, ID 83725 USA

来源：

GEOPHYSICS | 2006年 / 71卷 / 06期

关键词：

D O I：

10.1190/1.2335659

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Prestack depth migration (PSDM) analysis has the potential to significantly improve the accuracy of both shallow seismic reflection images and the measured velocity distributions. In a study designed to image faults in the Alvord Basin, Oregon, at depths from 25-1000 m, PSDM produced a detailed reflection image over the full target depth range. In contrast, poststack time migration produced significant migration artifacts in the upper 100 m that obscured reflection events and limited the structural interpretation in the shallow section. Additionally, an abrupt increase from similar to 2500 to > 3000 m/s in the PSDM velocity model constrained the interpretation of the transition from sedimentary basin fill to basement volcanic rocks. PSDM analysis revealed a complex extensional history with at least two distinct phases of basin growth and a midbasin basement high that forms the division between two major basin compartments.

引用

页码：B175 / B181

页数：7

共 30 条

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