System and method for seismic data inversion

摘要

A system and computer-implemented method for determining properties of a subsurface region of interest from seismic data include obtaining seismic data and an initial earth property model, forward modeling using the initial earth property model to create modeled seismic data, transforming the modeled and actual seismic data to create frequency domain modeled and actual seismic data including amplitude portion and phase portions, measuring the misfit between the frequency domain modeled and actual seismic data to produce frequency domain residual seismic data, performing phase unwrapping 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.

主权项

1. A computer-implemented method for determining properties of a subsurface region of interest from actual seismic data comprising:
a. obtaining actual seismic data representative of the subsurface region and selecting an arbitrary initial earth property model from a data source or generating an arbitrary initial earth property model for the subsurface region; b. performing forward modeling, using the arbitrary initial earth property model, to create modeled seismic data with similar acquisition specifications as the actual seismic data; c. 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 includes an amplitude portion and a phase portion; d. measuring the misfit between the frequency domain modeled seismic data and frequency domain actual seismic data to produce frequency domain residual seismic data; e. 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 f. 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, and wherein the performing forward modeling, transforming, measuring, performing phase unwrapping, and inverting steps are performed by a computer processor.