Theory of 3-D angle gathers in wave-equation seismic imaging
نویسندگان
چکیده
منابع مشابه
Theory of 3 - D angle gathers in wave - equation seismic imaging
I present two methods for constructing angle gathers in 3-D seismic imaging by downward extrapolation. Angles in angle gathers refer to the scattering angle at the reflector and provide a natural access to analyzing migration velocity and amplitudes. In the first method, angle gathers are extracted at each downwardcontinuation step by mapping transformations in constant-depth frequency slices. ...
متن کاملWide-azimuth angle gathers for anisotropic wave-equation migration
Extended common-image-point gathers (CIP) constructed by wide-azimuth TI waveequation migration contain all the necessary information for angle decomposition as a function of the reflection and azimuth angles at selected locations in the subsurface. The aperture and azimuth angles are derived from the extended images using analytic relations between the spaceand time-lag extensions using inform...
متن کاملCoordinate-independent angle-gathers for wave equation migration
We formulate angle decomposition, during and after wavefield extrapolation, independent of the choice of coordinate systems. The key idea is to describe the source-receiver separation during wavefield extrapolation as a vector quantity. This formulation links the reflection angle to the magnitude of the offset vector, thus reducing the cost and storage associated with angle decomposition. This ...
متن کاملWave-equation common-angle gathers for converted waves
Seismic images obtained by multicomponent wave-equation migration can be decomposed into angle-gathers with a transformation that generalizes the equivalent construction for primary waves. A particularly simple formulation is to use all three components of the offset vector separating sources and receivers at image points. Using full vector offsets, multicomponent angle-gathers are built using ...
متن کاملAngle-domain common image gathers by wave-equation migration
Shotand offset-domain common image gathers encounter problems in complex media. They can place events that come from different points in the subsurface at one subsurface location based on identical arrival times and horizontal slownesses. Angle-domain common image gathers uniquely define ray couples for each point in the subsurface, therefore each event in the data will be associated with only ...
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: Journal of Petroleum Exploration and Production Technology
سال: 2011
ISSN: 2190-0558,2190-0566
DOI: 10.1007/s13202-011-0004-8