Saudi Arabian Oil Company

Weiguang He

Yubing Li

Yi Luo

Lu Liu

Yue Ma

Song Han

Yujin Liu

A method for forming an image of a subterranean region of interest, using an observed seismic dataset, a seismic velocity model and a simulated seismic dataset based in part, on the seismic velocity model is provided. This method includes forming trace pairs from the simulated and observed seismic dataset, wherein each of the trace pairs comprises of an observed trace and a simulated trace. An objective function is formed based on a penalty function and a phase cross-correlation between the observed and simulated seismic trace of each of the trace pairs. This method further includes determining an extremum of the objective function and a seismic velocity increment based on the extremum. The seismic velocity model is updated by combining the seismic velocity increment and the seismic velocity model and the image of the subterranean region of interest is formed based in part, on the seismic velocity model.

System and method for forming a seismic velocity model and imaging a subterranean region

Methods and systems are disclosed for forming an image of a subterranean region of interest. The method includes receiving an observed seismic dataset and a seismic velocity model for the subterranean region of interest, and generating a simulated seismic dataset based on the seismic velocity model and the geometry of the observed seismic dataset. The method further includes determining a transformed observed seismic dataset by applying a nonlinear amplitude transform to the observed seismic dataset and determining a transformed simulated seismic dataset by applying the same transform to the simulated seismic dataset. The method still further includes forming an objective function based on the transformed observed seismic dataset and the transformed simulated seismic dataset, and determining an updated seismic velocity model based upon finding an extremum of the objective function.

Method and system for determination of seismic propagation velocities using nonlinear transformations

Methods of and systems for forming an image of a subterranean region of interest are disclosed. The method includes obtaining an observed seismic dataset and a seismic velocity model for the subterranean region of interest and generating a simulated seismic dataset based on the seismic velocity model and the source and receiver geometry of the observed seismic dataset. The method also includes forming a plurality of time-windowed trace pairs from the simulated and the observed seismic datasets, and forming an objective function based on a penalty function and a cross-correlation between the members of each pair. The method further includes determining a seismic velocity increment based on the extremum of the objective function and forming an updated seismic velocity model by combining the seismic velocity increment and the seismic velocity model, and forming the image of the subterranean region of interest based on the updated seismic velocity model.

A computer-implemented method may include obtaining seismic data acquired in a time-domain for a subterranean region of interest. The method may further include obtaining a property model for the subterranean region of interest. The method may further include determining one or more time shifts using a segment dynamic image warping function based on the seismic data and the property model. The method may further include determining an adjoint source operator using the derived time shift and one-way wave equation. The method may further include updating the property model using a gradient solver in a data-domain reflection traveltime inversion. The method may further include outputting the updated property model for the subterranean region of interest. The method may further include generating a seismic image for the subterranean region of interest using the updated property model.

Method and system for reflection-based travel time inversion using segment dynamic image warping

Methods and systems are disclosed for updating a seismic velocity model of a subterranean region of interest. The method includes receiving an observed seismic dataset and a seismic velocity model, and generating a simulated seismic dataset based on the seismic velocity model and the geometry of the observed seismic dataset, wherein each dataset is composed of a plurality of seismic traces. The method further includes determining a transformed observed seismic dataset and a transformed simulated seismic dataset by determining the instantaneous frequency of at least one member of the plurality of observed seismic traces; and at least one member of the plurality of simulated seismic traces. The method still further includes forming an objective function based on the transformed observed seismic dataset and the transformed simulated seismic dataset and determining an updated seismic velocity model based on an extremum of the objective function.

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Beijing, China

Weiguang He