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:
Apr. 18, 1995
Filed:
Jul. 28, 1993
Applicant:
Inventor:
Jean-Pierre Martin, Colombes, FR;
Assignee:
Compagnie Generale de Geophysique, Massy, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01V / ; G01V / ;
U.S. Cl.
CPC ...
324346 ;
Abstract
The method of the invention consists in measuring remanent magnetization along a borehole drilled through a geological bed, in detecting the set of reversals in the remanent magnetization, in measuring the induced magnetization at the various levels in said bed, in detecting maxima in the induced magnetization, and in correlating these measurements with known dates, firstly of reversals in the earth's magnetic field and secondly of terrestrial phenomena that have given rise to concentrations of highly magnetic substances, thus making it possible to give dates to the various levels of the bed. The method is particularly applicable to oil prospecting.