Wavelet based intercept attribute for seismic exploration
First Claim
1. A wavelet-based method for analysis of seismic data comprising:
- acquiring a plurality of seismic traces;
applying a wavelet transform to said plurality of seismic traces, said wavelet transform having a basis wavelet and producing wavelet coefficients for localized scales and localized time or depth points; and
calculating an intercept by regression for at least one of said localized time or depth points, wherein said intercept is used to form images of the subsurface.
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Abstract
A wavelet-based method for improving the quality of seismic data utilizing the intercept determined by applying least squares regression to the wavelet transform of a seismic trace. The intercept is calculated for every time point of the wavelet transform for each seismic trace. The intercepts are then plotted versus time or depth. These plots are used in place of seismic traces themselves to create two dimensional and three dimensional seismic section images. In one embodiment, the real and imaginary portions of the selected wavelet transform are weighted to generate a finer representation of the intercept. In another embodiment, a minimum amplitude value is utilized to establish a noise floor, thus stabilizing the regression calculation. In yet another embodiment, a taper of the amplitude is applied to wavelet enhance the resolving power of the wavelet.
16 Citations
26 Claims
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1. A wavelet-based method for analysis of seismic data comprising:
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acquiring a plurality of seismic traces; applying a wavelet transform to said plurality of seismic traces, said wavelet transform having a basis wavelet and producing wavelet coefficients for localized scales and localized time or depth points; and calculating an intercept by regression for at least one of said localized time or depth points, wherein said intercept is used to form images of the subsurface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 14, 15, 16, 21, 22, 23, 24)
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10. A method for analysis of seismic trace data comprising:
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performing a continuous wavelet transform on a seismic trace, said transform producing wavelet coefficients across a range of scales for each localized time point; calculating the intercept across a range of scales for each localized time or depth point of said transform by a regression means, thereby producing an intercept trace; and applying image processing to the intercept trace, thereby producing an intercept trace section. - View Dependent Claims (11, 12, 13, 17, 18, 19)
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20. A method of processing seismic data, said method comprising:
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providing original seismic signal data; putting said seismic data through preprocessing; putting said seismic data through a wavelet transform; determining the intercept; and using the characteristics of the intercept function to create an output value. - View Dependent Claims (25)
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26. A wavelet based method for analysis of seismic data comprising:
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acquiring at least one seismic trace; applying a wavelet transform to said at least one seismic trace, said wavelet transform having a basis wavelet and producing wavelet coefficients for localized scales and localized time or depth points; calculating intercepts by regression for a plurality of localized time or depth points; and forming an intercept trace from the intercepts for a plurality of localized time or depth points.
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Specification