Low frequency sonic logging

Details Low frequency sonic logging Low frequency sonic logging

G - Physics

01

V

349/6

G01V 1/40 (2006.01) G01V 1/44 (2006.01)

Patent

CA 1218141

ABSTRACT Methods and apparatus are described utilizing low frequency tube waves in determining characteristics of formations traversed by a borehole. Data received from three spaced receiving transducers are utilized in formulating quantities representative of complex compressibility of formations as well as loss parameters attributed to formation characteristics. When these two factors are recorded as a function of depth, interpretation is made readily available as to the permeability and rigidity of subsurface earth formations. Data is also provided by way of the present invention to enable interpretation concerning the presence of fractures or cracks in the earth formations. The methods and apparatus may also be utilized to examine the condition of casing in a borehole.

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