Electricity: measuring and testing – Particle precession resonance – Using well logging device
Patent
1998-05-26
2000-10-31
Oda, Christine K.
Electricity: measuring and testing
Particle precession resonance
Using well logging device
324300, G01V 300
Patent
active
061408174
ABSTRACT:
Technique and apparatus are disclosed for identifying characteristics of hydrocarbons, such as distinguishing light and heavy formation oil, in formations surrounding an earth borehole. The technique and apparatus can also be used for determining residual oil saturation, permeability, and bound water volume. An embodiment of the method of the invention includes the following steps: providing a nuclear magnetic resonance logging device that is moveable through the borehole; providing, from the logging device, a polarizing magnetic field and cycles of a magnetic pulse sequence, and receiving magnetic resonance spin echoes from the formations; processing the received spin echoes to produce a T.sub.2 distribution; computing a magnetic resonance porosity from the T.sub.2 distribution; deriving a measure of total porosity of the formations; and comparing the magnetic resonance porosity with the total porosity.
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Flaum Charles
Kleinberg Robert L.
Batzer William B.
Novack Martin M.
Oda Christine K.
Schlumberger Technology Corporation
Shrivastav Brij B.
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