| 摘要 |
A system and computer-implemented method for determining properties of a subsurface region of interest from seismic data is disclosed. In an embodiment, the method includes obtaining seismic data representative of the subsurface region and an initial earth property model for the subsurface region, performing forward modeling using the initial earth property model to create modeled seismic data with similar acquisition specifications as the actual seismic data, transforming the modeled and actual seismic data to a temporal Fourier frequency domain to create frequency domain modeled and actual seismic data wherein the frequency domain modeled and actual seismic data include an amplitude portion and a phase portion, measuring the misfit between the frequency domain modeled seismic data and frequency domain actual seismic data to produce frequency domain residual seismic data, performing phase unwrapping of the phase portion of certain observed frequency components of the frequency domain residual seismic data to create an unwrapped residual phase portion, and inverting the unwrapped residual phase portion to determine desired properties of the subsurface region of interest, wherein the inverting minimizes an objective function defined to measure the misfit. The method may also include phase extrapolation. Additionally, the method may include a second inverting step using the result of the first inverting step as a starting model. The system includes a data source, a user interface, and a processor configured to execute computer modules designed to perform the method.
|
