A simultaneous inversion of seismic traveltimes and amplitudes for velocity and attenuation

被引:30
作者
Vasco, DW
Peterson, JE
Majer, EL
机构
[1] Center for Computational Seismology, Ernest Orlando Lawrence Berkeley N., Berkeley
关键词
D O I
10.1190/1.1444091
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
It is possible to efficiently use traveltime and amplitude information to infer variations in velocity and Q. With little additional computation, terms accounting for source radiation pattern and receiver coupling may be included in the inversion. The methodology is based upon a perturbation approach to paraxial ray theory. The perturbation approach linearizes the relationship between velocity deviations and traveltime and amplitude anomalies. Using the technique, we infer the velocity and attenuation structure at a fractured granitic site near Raymond, California. A set of four well pairs are examined and each is found to contain two zones of strong attenuation. The velocity variations contain an upper low velocity region corresponding to the uppermost attenuating zone. The location of these zones agrees with independent well-log and geophysical data. The velocity and attenuation anomalies appear to coincide with extensively fractured sections of the borehole and may indicate fracture zones rather than individual fractures.
引用
收藏
页码:1738 / 1757
页数:20
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