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US 5,179,518 AGranted
Method of processing seismic reflection data in order to obtain improved seismic sections
AssigneeSociete Nationale Elf Aquitaine (Production)
InventorsN. Keskes, P. Boronad, M. Verprat, G. Sibille
Life of this patent
Estimating the term…
Abstract
A method of processing seismic recordings in order to obtain an improved seismic section by taking into account, during summing, the real geometric configuration of the alignments of signals in the collection of elementary recordings before sum.
Claims11
A method of generating improved sum traces during exploration of an environment by seismic reflection, in order to obtain an improved seismic section, the method comprising the steps of:
- generating collections of elementary recordings obtained by a multiple cover technique;
- processing the generated collections of elementary recordings in control mean such that each of the collections are referenced in planes having coordinate axes of X in abscissas, expressing a distance, and of T in ordinates, expressing a time or a depth, with reflections from the subsoil appearing as sub-horizontal lineations associated with extrema of recordings correlating with each other;
- and
- transforming each of the processed collections of elementary recordings into an improved sum trace to obtain an improved seismic section, comprising the steps of
- summing samples of the elementary recordings of the collection which are associated with a same time in order to obtain a conventional sum trace,
- determining the dimensions Ti of the conventional sum trace for which amplitude peaks Pi occur,
- picking out the sub-horizontal lineations present in the collection;
- selecting in the collection, in accordance with a given method, within each range PLi of predetermined width Ti-.DELTA.Ti to ti+.DELTA.Ti surrounding each of the dimensions Ti and intercepting a certain number of sub-horizontal lineations, at the most one of these sub-horizontal lineations considered as a most representative of a studied range, Li,
- designating a summing corridor of predetermined width which surrounds a pivot curve passing through point Pj of coordinates Tj, each belonging to a selected sub-horizontal lineation Lj, and
- summing within the summing corridor, samples located along the sub-horizontal lineations in order to obtain a sum trace, according to a method for which an amplitude at the time Tj is the result of summing along the sub-horizontal lineation Lj and an amplitude at a time T between two times Tj and Tj+1, the result of said summing of the samples located on a sub-horizontal lineation being obtained by interpolation between successively selected sub-horizontal lineations Lj and Lj+1.
7 more elements
A method of generating improved sum traces during exploration of an environment by seismic reflection, in order to obtain an improved seismic section, the method comprising the steps of:
- generating collections of elementary recordings obtained by a multiple cover technique;
- processing the generated collections of elementary recordings in control means such that each of the collections are referenced in planes having coordinate axes of X in abscissas, expressing a distance, and of T in ordinates, expressing a time or a depth, with reflections from the subsoil appearing as sub-horizontal lineations associated with extrema of recordings correlating with each other;
- transforming each of the processed collections of elementary recordings into an improved sum trace, comprising the steps of
- summing samples of the elementary recordings of the collection which are associated with a same time in order to obtain a conventional sum trace,
- determining the dimensions Ti of the conventional sum trace for which amplitude peaks Pi occur,
- picking out the sub-horizontal lineations present in the collection,
- selecting in the collection, in accordance with a given method, within each range PLi of predetermined width Ti-.DELTA.Ti to Ti+.DELTA.Ti surrounding each of the dimensions Ti and intercepting a certain number of sub-horizontal lineations, at the most one of these sub-horizontal lineations considered as a most representative of a studied range, Li,
- designating a summing corridor of predetermined width which surrounds a pivot curve passing through points Pj of coordinates Tj each belonging to a selected sub-horizontal lineation Lj, and
- summing within the summing corridor, samples located along the sub-horizontal lineations in order to obtain a sum trace, according to a method for which an amplitude at the time Tj is the result of summing along the sub-horizontal lineation Lj and an amplitude at a time T between two times Tj and Tj+1, the result of said summing of the samples located on a sub-horizontal lineation being obtained by interpolation between successively selected sub-horizontal lineations Lj and Lj and Lj+1;
- and
- generating the improved seismic section by juxtaposition of the improved sum traces obtained from all the collections of elementary recordings.
8 more elements
A method of processing signals recorded on the surface of the ground during the exploration of an environment by seismic reflection, in order to obtain an improved seismic section, the method comprising the steps of:
- generating collections of elementary recordings obtained by the multiple cover technique, the recordings having undergone a processing such that each of the collections, referenced in a plane having coordinate axes of X in abscissas, expressing a distance, and of T in ordinates, expressing a time or a depth, the reflections from the subsoil appearing as sub-horizontal lineations associated with extrema of recordings correlating with each other;
- processing each of the collections of elementary recordings to transform each collection into an improved sum trace, comprising the steps of
- summing samples of the elementary recordings of the collection which are associated with a same time in order to obtain a conventional sum trace,
- determining the dimensions Ti of the conventional sum trace for which amplitude peaks Pi occur,
- picking out the sub-horizontal lineations present in the collection,
- selecting in the collection, in accordance with a given method, within each range PLi of predetermined width Ti-.DELTA.Ti to Ti+.DELTA.Ti surrounding each of the dimensions Ti and intercepting a certain number of sub-horizontal lineations, at the most one of these sub-horizontal lineations considered as the most representative of the studied range, Li,
- designating a summing corridor of predetermined width which surrounds a pivot curve passing through the point Pj of coordinates Tj, each belonging to a selected sub-horizontal lineation Lj, and
- summing within the summing corridor, samples located along the sub-horizontal lineations in order to obtain a sum trace, according to a method for which an amplitude at the time Tj is the result of summing along the sub-horizontal lineation Lj and the amplitude at a time T between two times Tj and Tj+1, the result of said summing of the samples located on a sub-lineation being obtained by interpolation between successively selected sub-horizontal lineations Lj and Lj+1;
- and
- generating the improved seismic section by juxtaposition of the improved sum traces obtained from all the collections of elementary recordings.
7 more elements
Dependencies are inferred from the claim text.