Method to adapt a template dataset to a target dataset by using curvelet representations
First Claim
1. A method for developing at least one template to use to remove noise from or interpret noise in a target data set of geophysical data, wherein the template is adapted to the target dataset, said method comprising:
- (a) transforming the target data using a selected complex-valued, directional, multi-resolution transform (“
CDMT”
) satisfying the Hilbert transform property at least approximately to obtain a set of expansion coefficients that are complex numbers having a magnitude and phase;
(b) selecting an initial template representing noise in the target data set and transforming the initial template using said selected CDMT;
(c) adapting the transformed template to the transformed target data by adjusting the template'"'"'s expansion coefficients within allowed ranges of adjustment so as to better match the expansion coefficients of the target data set, thereby creating an adapted template; and
(d) using the adapted template to suppress noise, further process, or interpret the target data set or other geophysical data in order to prospect for or produce hydrocarbons;
wherein at least one of (a)-(c) are performed using a computer.
0 Assignments
0 Petitions
Accused Products
Abstract
Method for adapting a template to a target data set. The template may be used to remove noise from, or interpret noise in, the target data set. The target data set is transformed (550) using a selected complex-valued, directional, multi-resolution transform (‘CDMT’) satisfying the Hubert transform property at least approximately. An initial template is selected, and it is transformed (551) using the same CDMT. Then the transformed template is adapted (560) to the transformed target data by adjusting the template'"'"'s expansion coefficients within allowed ranges of adjustment so as to better match the expansion coefficients of the target data set. Multiple templates may be simultaneously adapted to better fit the noise or other component of the data that it may be desired to represent by template.
27 Citations
22 Claims
-
1. A method for developing at least one template to use to remove noise from or interpret noise in a target data set of geophysical data, wherein the template is adapted to the target dataset, said method comprising:
-
(a) transforming the target data using a selected complex-valued, directional, multi-resolution transform (“
CDMT”
) satisfying the Hilbert transform property at least approximately to obtain a set of expansion coefficients that are complex numbers having a magnitude and phase;(b) selecting an initial template representing noise in the target data set and transforming the initial template using said selected CDMT; (c) adapting the transformed template to the transformed target data by adjusting the template'"'"'s expansion coefficients within allowed ranges of adjustment so as to better match the expansion coefficients of the target data set, thereby creating an adapted template; and (d) using the adapted template to suppress noise, further process, or interpret the target data set or other geophysical data in order to prospect for or produce hydrocarbons; wherein at least one of (a)-(c) are performed using a computer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
-
-
17. A method for producing hydrocarbons from a subsurface region, comprising:
-
(a) conducting a seismic survey of the subsurface region; (b) obtaining survey data with noise removed by steps comprising; transforming the survey data using a selected complex-valued, directional, multi-resolution transform (“
CDMT”
) satisfying the Hilbert transform property at least approximately to obtain a set of expansion coefficients that are complex numbers having a magnitude and phase;(ii) selecting an initial template representing noise in the survey data and transforming the initial template using said selected CDMT; (iii) adapting the transformed template to the transformed survey data by adjusting the template'"'"'s expansion coefficients within allowed ranges of adjustment so as to better match the expansion coefficients of the survey data, thereby creating an adapted template; and (iv) subtracting the adapted template from the survey data in the transform domain and inverse transforming back to the data domain, or inverse transforming the adapted template to the data domain and then subtracting it from the survey data, thereby creating a noise-suppressed survey dataset; (c) drilling a well into the subsurface region based at least in part on interpretation of the noise-suppressed survey dataset; and (d) producing hydrocarbons from the well.
-
-
18. A computer-implemented method for adapting a template to a target data set of geophysical data so that the template better represents a selected component of the target data set, said method comprising:
-
(a) transforming the target data using a selected complex-valued, directional, multi-resolution transform (“
CDMT”
) satisfying the Hilbert transform property at least approximately to obtain a set of expansion coefficients that are complex numbers having a magnitude and phase;(b) selecting an initial template representing a selected component of the target data set and transforming the initial template using said selected CDMT; (c) adapting the transformed template to the transformed target data by adjusting the template'"'"'s expansion coefficients within allowed ranges of adjustment so as to better match the expansion coefficients of the target data set, thereby creating an adapted template; and (d) using the adapted template to suppress noise, further process, or interpret the target data set or other geophysical data in order to prospect for or produce hydrocarbons; wherein at least one of (a)-(c) are performed using a computer. - View Dependent Claims (19, 20, 21, 22)
-
Specification