Method of evaluating a subsurface region using gather sensitive data discrimination
First Claim
1. A method of enhancing a certain type of seismic event data with respect to an overall set of seismic event data which includes other, different types of seismic event data, all of said data being recorded for a particular subterranean region, said method comprising the steps of:
- a) generating a particular type of gather from said overall data such that the gather includes at least a portion of said certain seismic event data and at least a portion of said other data;
b) incorporating into said gather a series of data discrimination lines at positions and directions which are established in said gather non-analytically in a predetermined way based, at least in part, on an approximate model of the particular subterranean region; and
c) using said data discrimination lines, enhancing said certain type of seismic event data which is present in said gather with respect to the other data within the gather.
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Accused Products
Abstract
A method of evaluating a subsurface region by separating/enhancing a certain type of seismic event data of interest from an overall set of seismic event data which includes other, different types of seismic event data is disclosed herein. In accordance with one feature, a particular type of gather is generated from the seismic event data such that the gather includes at least a portion of the data which is of interest and at least a portion of the other data. A series of data discrimination lines are incorporated into the gather at positions and directions which are established in the gather in a predetermined way. Using the data discrimination lines, the data of interest which is present in the gather is separated/enhanced with respect to the other data within the gather. The separated data may be used for example in producing a map of the particular subterranean region. In accordance with another feature, the gather is selected such that the incorporated discrimination lines approach a near parallel relationship with one another. Thereby, the data is transformed in a way which causes the discrimination lines to be parallel with one another, resulting in reduced frequency distortion accompanied by improved accuracy in the separation/enhancement of data. In accordance with still another feature, the disclosed data separation/enhancement method is compatible with an iterative approach.
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Citations
30 Claims
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1. A method of enhancing a certain type of seismic event data with respect to an overall set of seismic event data which includes other, different types of seismic event data, all of said data being recorded for a particular subterranean region, said method comprising the steps of:
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a) generating a particular type of gather from said overall data such that the gather includes at least a portion of said certain seismic event data and at least a portion of said other data; b) incorporating into said gather a series of data discrimination lines at positions and directions which are established in said gather non-analytically in a predetermined way based, at least in part, on an approximate model of the particular subterranean region; and c) using said data discrimination lines, enhancing said certain type of seismic event data which is present in said gather with respect to the other data within the gather. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 16, 17, 18, 24)
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10. In a system for establishing a map of the value of a particular characteristic of a subterranean region of ground between two generally vertically extending boreholes from which a set of seismic event data relating to said particular characteristic is generated, a method comprising the steps of:
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a) producing an approximate model of said region using at least one portion of said seismic event data set; b) generating a set of gathers from said overall data set such that the gathers include a particular type of said seismic event data as well as other types of said seismic event data; c) assuming a particular boundary geometry for strata within said region; d) incorporating into each gather a series of data discrimination lines at positions and directions which are established in each gather non-analytically in a predetermined way based, at least in part, on the approximate model of the subterranean region; e) enhancing a subset of seismic event data from the overall set of gathers based upon a specific directional orientation of the subset with respect to the discrimination lines; and f) adjusting the assumed boundary geometry based upon the enhanced data subset for use in establishing a more definitive map of said region. - View Dependent Claims (11, 12, 13, 14, 15, 25)
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19. A method of enhancing a certain type of seismic event data with respect to an overall set of seismic event data which includes other, different types of seismic event data, all of said data being recorded for a particular subterranean region, said method comprising the steps of:
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a) generating a particular type of gather from said overall data such that the gather includes at least a portion of said certain seismic event data and at least a portion of said other data; b) incorporating into said gather a series of data discrimination lines at positions and directions which are established in said gather in a predetermined way such that the discrimination lines, in their established positions, are represented non-analytically and are non-parallel with respect to one another; and c) using said data discrimination lines, enhancing said certain type of seismic event data which is present in said gather with respect to the other data within the gather. - View Dependent Claims (26)
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20. A method of enhancing a certain type of seismic event data with respect to an overall set of seismic event data which includes other, different types of seismic event data, all of said data being recorded for a particular subterranean region, said method comprising the steps of:
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a) generating a particular type of gather from said overall data such that the gather includes at least a portion of said certain seismic event data and at least a portion of said other data; b) incorporating into said gather a series of data discrimination lines at positions and directions which are established in said gather non-analytically in a predetermined way based, at least in part, on an approximate model of the particular subterranean region; and c) using said data discrimination lines, enhancing said certain type of seismic event data which is present in said gather with respect to the other data within the gather based upon a specified relationship between the certain seismic event data and the established positions and directions of said discrimination lines. - View Dependent Claims (27)
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21. In a system for establishing a map of the value of a particular characteristic of a subterranean region of ground between two generally vertically extending boreholes from which a set of seismic event data relating to said particular characteristic is generated, a method comprising the steps of:
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a) producing an approximate model of said region using at least one portion of said seismic event data set; b) generating a set of gathers from said overall data set such that the gathers include a particular subset of said seismic event data as well as other types of said seismic event data; c) assuming a particular boundary geometry for strata within said region; d) incorporating into each gather a series of data discrimination lines at positions and directions which are established in each gather non-analytically in a predetermined way based, at least in part, on an approximate model of the particular subterranean region; e) enhancing the particular subset of seismic event data from the overall set of gathers based upon a specific directional orientation of the subset with respect to the discrimination lines; and f) adjusting the assumed boundary geometry based upon the enhanced particular data subset for use in establishing a more definitive map of said region; g) incorporating in each gather a new series of data discrimination lines at new positions and directions which are established in each gather non-analytically in said predetermined way using said approximate model and the adjusted assumed boundary geometry; and h) using said new discrimination lines and said approximate model, enhancing a more definitive particular subset of said seismic event data with respect to the overall set of seismic event data based upon said specific directional orientation of the new data subset with respect to the new discrimination lines and, thereafter, readjusting the boundary geometry based upon the more definitive subset of seismic event data for use in reestablishing a still more definitive map of said region. - View Dependent Claims (28)
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22. In a system for establishing a map of the value of a particular characteristic of a subterranean region of ground between two generally vertically extending boreholes from which a set of seismic event data relating to said particular characteristic is generated, a method comprising the steps of:
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a) producing an approximate model of said region using at least one portion of said seismic event data set; b) generating a set of gathers from said overall data set such that the gathers include a particular subset of said seismic event data as well as other types of said seismic event data; c) assuming a particular boundary geometry for strata within said region such that the assumed boundaries are established in directions which are generally parallel with the directions of strata within said region; d) incorporating into each gather a series of data discrimination lines at positions and directions which are established in each gather non-analytically in a predetermined way which, based on the generally parallel relationship of the assumed boundaries with the directions of strata, causes said particular subset of seismic event data corresponding to the strata within said gather to be oriented generally parallel with the discrimination lines; e) enhancing said particular subset of seismic event data from the overall set of gathers based upon the generally parallel directional orientation of the particular subset with respect to the discrimination lines; and f) adjusting the assumed boundary geometry based upon the enhanced particular data subset for use in establishing a more definitive map of said region. - View Dependent Claims (29)
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23. In a system for establishing a map of the value of a particular characteristic of a subterranean region of ground between two generally vertically extending boreholes from which a set of seismic event data relating to said particular characteristic is generated, a method comprising the steps of:
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a) producing an approximate model of said region using at least one portion of said seismic event data set; b) selecting a particular type of gather from a group of different types of gathers such that the discrimination lines in the selected gather most nearly approach a parallel relationship with respect to one another as compared with the appearance of the discrimination lines in any other type of gather, and, thereafter, generating a set of gathers of the selected particular type from the overall seismic event data set such that the set of gathers includes a particular subset of said seismic event data as well as other types of said seismic event data; c) assuming a particular boundary geometry for strata within said region; d) incorporating into each gather a series of data discrimination lines at positions and directions which are established in each gather non-analytically in a predetermined way; e) enhancing the particular subset of seismic event data from the overall set of gathers based upon a specific directional orientation of the particular subset with respect to the discrimination lines; and f) adjusting the assumed boundary geometry based upon the enhanced particular data subset for use in establishing a more definitive map of said region. - View Dependent Claims (30)
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Specification