Method for shallow water flow detection
First Claim
1. A method for determining shallow water flow risk, comprising:
- developing a geologic model of shallow water flow risk areas;
performing a stratigraphic analysis on reflected P-wave seismic data of the geologic model to determine a control location within the reflected P-wave seismic data;
applying a pre-stack full waveform inversion on the reflected P-wave seismic data at the control location to provide an elastic earth model of the shallow water flow risk areas based on the geologic model and the stratigraphic analysis, wherein the elastic earth model is determined by matching the reflected P-wave seismic data with synthetic seismic data of the geologic model and the elastic earth model comprises P-wave velocity and S-wave velocity;
computing a ratio between the P-wave velocity and the S-wave velocity; and
identifying multiple shallow water flow risk areas using the relationship of the P-wave velocity to the S-wave velocity ratio with respect to seismic travel time.
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Abstract
The present invention presents a method for determining shallow water flow risk using seismic data. The seismic data can be processed to enhance its stratigraphic resolution by sub-sampling the seismic data to less than a two-millisecond interval. Performing a stratigraphic analysis on the seismic data and evaluating the seismic attributes of the seismic data can be used to select a control location. A pre-stack waveform inversion is applied to seismic data at a selected control location to provide an elastic model, which includes pressure-wave velocity and shear-wave velocity. The shallow water flow risk is then determined using the elastic model by comparing the pressure-wave velocity to the shear-wave velocity. A post-stack inversion can be applied on the seismic data using the elastic model to model a 3D volume to determine the shallow water flow risk across the 3D volume.
45 Citations
29 Claims
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1. A method for determining shallow water flow risk, comprising:
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developing a geologic model of shallow water flow risk areas; performing a stratigraphic analysis on reflected P-wave seismic data of the geologic model to determine a control location within the reflected P-wave seismic data; applying a pre-stack full waveform inversion on the reflected P-wave seismic data at the control location to provide an elastic earth model of the shallow water flow risk areas based on the geologic model and the stratigraphic analysis, wherein the elastic earth model is determined by matching the reflected P-wave seismic data with synthetic seismic data of the geologic model and the elastic earth model comprises P-wave velocity and S-wave velocity; computing a ratio between the P-wave velocity and the S-wave velocity; and identifying multiple shallow water flow risk areas using the relationship of the P-wave velocity to the S-wave velocity ratio with respect to seismic travel time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A computerized method for determining shallow water flow risk using seismic data comprising:
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processing reflected P-wave seismic data to enhance its stratigraphic resolution, wherein the reflected P-wave seismic data are obtained from marine towed streamers; selecting a control location comprising; performing a stratigraphic analysis on the reflected P-wave seismic data; and evaluating the seismic attributes of the reflected P-wave seismic data; applying a pre-stack full waveform inversion on the reflected P-wave seismic data at the control location to provide an elastic earth model of shallow water flow risk areas, wherein the elastic earth model is determined by matching the reflected P-wave seismic data with synthetic seismic data of the geologic model and the elastic earth model comprises P-wave velocity and S-wave velocity; applying a post-stack inversion on the reflected P-wave seismic data using the elastic earth model to map a ratio between the P-wave velocity and the S-wave velocity in a three dimensional (3D) volume; and determining multiple shallow water flow risk areas using the relationship of the ratio between the P-wave velocity and the S-wave velocity with respect to seismic travel time. - View Dependent Claims (27)
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28. A method for determining a shallow water flow risk area, comprising:
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developing a geologic model of the shallow water flow risk area; performing a stratigraphic analysis on reflected P-wave seismic data of the geologic model to determine a control location within the reflected P-wave seismic data; applying a pre-stack full waveform inversion on the reflected P-wave seismic data at the control location to provide P-wave velocity (Vp) and Poisson'"'"'s ratio; computing for S-wave velocity (Vs) using the P-wave velocity (Vp) and the Poisson'"'"'s ratio; computing for a ratio (Vp/Vs) between the P-wave velocity (Vp) and the S-wave velocity (Vs); and identifying multiple shallow water flow risk areas using the relationship of the ratio (Vp/Vs) with respect to seismic travel time. - View Dependent Claims (29)
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Specification