System and method for velocity anomaly analysis
AssigneeChevron U.S.A. Inc.
InventorsJeffrey William Nealon, Eric Liebes
Life of this patent
Estimating the term…
Abstract
Methods of analyzing velocity models include defining velocity anomaly models for a subsurface region under study. The velocity anomaly model is overlain on a seismic stack image to produce a hybrid velocity/amplitude model. Regions in which stack amplitudes are coincident with velocity anomalies may be interpreted as representing structures of interest. In an embodiment, clathrate deposits are identified using the hybrid model. In an embodiment, geobodies are identified, and velocity anomalies are constrained by the geobodies for revising migration models.
Claims15
A computer implemented method of analyzing a seismic image of a subsurface region, comprising:
- obtaining a velocity model and a seismic image for the subsurface region;
- smoothing the velocity model to produce a smoothed velocity model using a computing system;
- subtracting the velocity model from the smoothed velocity model to create an anomaly velocity model using the computing system;
- and
- creating a hybrid anomaly velocity model based on the anomaly velocity model and the seismic image using the computing system.
A system configured to analyze a seismic image of a subsurface region, the system comprising:
- one or more processors configured to execute computer program modules, the computer program modules comprising:
- a velocity modeling module, configured to obtain a velocity model and a seismic image for the subsurface region;
- a preprocessing module, configured to smooth the velocity model to produce a smoothed velocity model;
- a calculating module, configured to subtract the velocity model from the smoothed velocity model to create an anomaly velocity model;
- and
- an anomaly modeling module, configured to create a hybrid anomaly velocity model based on the anomaly velocity model and the seismic image.
A non-transitory machine readable medium comprising machine executable instructions for performing a method of analyzing a seismic image of a subsurface region, comprising:
- obtaining a velocity model and a seismic image for the subsurface region;
- smoothing the velocity model to produce a smoothed velocity model;
- subtracting the velocity model from the smoothed velocity model to create an anomaly velocity model;
- and
- creating a hybrid anomaly velocity model based on the anomaly velocity model and the seismic image.
Dependencies are inferred from the claim text.