Patent ID: 7751279
Filing Date: 2010-07-06
Classification: G01V

Abstract:
1. A method of estimating a property of an earth formation including a first zone having a large impedance contrast with an overlying second zone, the method comprising: (a) positioning a first sensor in the first zone, wherein the first zone comprises salt; (b) activating an energy source at a plurality of source positions at or near a surface of the earth; (c) recording signals from the first sensor responsive to said activating of the source, the recorded signals including a reflection from: (A) a lower surface of the first zone, and (B) an interface in the earth formation below the first zone; (d) picking travel-times in the recorded signals corresponding to the reflections; and (e) estimating from the picked travel-times at least one of (i) a position of the lower surface of the first zone, (ii) a position of the interface; and (iii) a velocity between the first zone and the interface.