Patent ID: 6229308
Filing Date: 2001-05-08
Classification: G01N,G01R,G01V,Y02A

Abstract:
A method for determining properties of earth formations surrounding a borehole, comprising the steps of:(a) providing a logging device that is moveable through the borehole;(b) transmitting electromagnetic energy from said logging device into the formations, and receiving nuclear magnetic resonance spin echoes at said logging device;(c) performing step (b) a plurality of times, with a respective plurality of different transmitting and/or receiving conditions to obtain a plurality of measurements;(d) generating a formation model that includes a plurality of model components for a brine phase and a plurality of model components for a native oil phase;(e) modifying the model components to optimize the model with respect to the measurement signals; and(f) outputting model components of the optimized model.