The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 10, 1987
Filed:
Dec. 24, 1984
Jean-Jacques Raoult, Paris, FR;
Compagnie Francaise des Petroles, Paris, FR;
Abstract
In a process for obtaining seismic data relating to an exploratory well, a seismic wave transmitter and a seismic wave receiver are provided, one arranged on the surface adjacent the well and the other at a plurality of measurement points down the well, and the output of the receiver is processed in a processing installation. The measurement points are divided into at least two groups, each of which comprises a plurality of measurement points spaced apart in a distance (D.sub.z) which is less than a predetermined limit distance so as to avoid aliasing, and the groups of measurement points are separated from each other by a distance (D) greater than the limit distance. In the processing installation separation of the down-going waves from the up-going waves belonging to the same group is carried out before coherence filtration of the separated waves.