Methods of determining lithological characteristics of an...

Details Methods of determining lithological characteristics of an... Methods of determining lithological characteristics of an...

G - Physics

01

V

349/14, 349/3

G01V 1/28 (2006.01) G01V 1/30 (2006.01)

Patent

CA 1256191

ABSTRACT Methods and related apparatus are described for determining lithological characteristics, such as forma- tion material type and porosity, of an underground forma- tion by utilizing compressional velocity (Vp) and shear velocity (Vs) data. One described method utilizes the plotting of Vp and/or Vs versus a Seismic Parameter, such as K/p or the Bulk Velocity, and boundaries of velocity values of certain formation material types to define a field of data points. By comparing the position of the data points to the boundaries of the formation material types, the formation material type and, later, porosity can be determined. A method is described for determining the presence of a hydrocarbon gas at a particular location in an underground formation utilizing the above methods. Also, a method is described for determining Vs from Vp data and obtained ratios of Vp and Vs for at least one formation material type.

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