SYSTEM AND METHOD FOR SEISMIC DATA INVERSION
First Claim
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 an initial earth property model for the subsurface region;
b. performing forward modeling, using the 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.
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Abstract
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.
63 Citations
16 Claims
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1. A computer-implemented method for determining properties of a subsurface region of interest from actual seismic data comprising:
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a. obtaining actual seismic data representative of the subsurface region and an initial earth property model for the subsurface region; b. performing forward modeling, using the 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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for determining properties of a subsurface region of interest from seismic data comprising:
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a. a data source containing computer-readable data including actual seismic data representative of the subsurface region of interest; b. a processor configured to execute computer-readable code from computer modules, the computer modules comprising; i. an initial model module configured to receive an initial property model from the data source or generate the initial property model; ii. a domain transformation module to transform the actual seismic data into a frequency domain to generate frequency domain seismic data; iii. a data modeling module to generate modeled seismic data from the initial property model or an updated property model; iv. a residual calculation module to calculate a residual wavefield; v. a phase preparation module to phase unwrap the frequency domain seismic data; vi. an inversion module to compute an objective function, a search direction, and update the initial property model or a previously updated property model. c. an user interface. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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16. An article of manufacture comprising a computer readable medium having a computer readable code embodied therein, the computer readable program code adapted to be executed to implement a method for determining properties of a subsurface region of interest from actual seismic data, the method comprising:
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a. performing forward modeling, via a computer, using an initial earth property model, to create modeled seismic data with the same or similar acquisition specifications as the actual seismic data; b. transforming, via a computer, the modeled and the recorded seismic data to a temporal Fourier frequency domain to create frequency domain modeled and frequency domain recorded seismic data wherein the frequency domain modeled seismic data and frequency domain recorded seismic data include an amplitude portion and a phase portion; c. measuring, via a computer, the misfit between the frequency domain modeled seismic data and frequency domain recorded seismic data to produce frequency domain residual seismic data; d. performing, via a computer, 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; e. inverting, via a computer, 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.
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Specification