Data acquisition and processing for invasion profile and gas zone analysis with NMR dual or multiple interecho spacing time logs
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United States of America Patent
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Mar 6, 2012
Grant Date -
Apr 8, 2010
app pub date -
Oct 3, 2008
filing date -
Oct 3, 2008
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Abstract
A method for obtaining a parameter of interest related to an earth formation, the method including: obtaining nuclear magnetic resonance (NMR) data from an NMR tool investigating the earth formation with a plurality of pulse sequences of radio frequency energy, each pulse sequence having a unique frequency, a first train of pulses having a first interecho time (TE1) and a second train of pulses having a second interecho time (TE2) different from the first interecho time; relating the NMR data to a partial porosity at points to establish an NMR response model; solving the NMR response model to calculate the partial porosity at each of the points in the earth formation; summing the partial porosity for each of the points corresponding to each depth of investigation to provide a pore volume; and associating each pore volume with the corresponding depth of investigation to provide the parameter of interest.
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