Automatic Velocity Analysis by using an High-resolution Bootstrapped Differential Semblance Method
نویسندگان
چکیده
منابع مشابه
velocity analysis using high-resolution bootstrapped differential-semblance
the purpose of velocity analysis is to extract the normal moveout velocity as a function of the zero-offset travel time at selected cdp locations along the seismic line. since results of velocity analysis depend on coherency estimator, an estimator that provides a high velocity resolution is essential. even though the conventional semblance method which is the most popular coherency estimator (...
متن کاملVelocity analysis using weighted semblance
Increasing the resolution of semblance-based velocity spectra, or semblance spectra, can improve the accuracy of normal moveout velocity estimates. The resolution of semblance spectra depends on the sensitivity of semblance to changes in velocity. By weighting terms in the semblance calculation that are more sensitive to changes in velocity, we can increase resolution. Our implementation of wei...
متن کاملTheory of differential semblance velocity analysis by wave-equation migration
Prestack wave equation migration using the double square root equation produces prestack image volumes free of artifacts, even in the presence of multipathing due to complex structure. In particular image gathers in angle or offset ray parameter are flat at correct velocity, and gathers in offset are concentrated at zero offset. Differential semblance measures the deviation from flatness or con...
متن کاملDSR Migration Velocity Analysis by Differential Semblance Optimization
The relative efficiency of Common Azimuth wave equation depth migration based on the double square root equation makes it an attractive engine for use in automated velocity updating schemes. One such automated velocity analysis procedure is Differential Semblance Optimization, which constructs velocity updates to reduce, and eventually minmize, a quantitative measure of image gather misfocussin...
متن کاملVelocity analysis using AB semblance a
I derive and analyze an explicit formula for a generalized semblance attribute, which is suitable for velocity analysis of prestack seismic gathers with distinct amplitude trends. While the conventional semblance can be interpreted as squared correlation with a constant, the AB semblance is defined as a correlation with a trend. This measure is particularly attractive for analyzing class II AVO...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Geophysics and Geophysical Exploration
سال: 2013
ISSN: 1229-1064
DOI: 10.7582/gge.2013.16.4.225