Multiple echo train inversion
a multi-echo train and inversion technology, applied in the field of multi-echo train inversion, can solve the problems of poor signal-to-noise ratio (snr), distortion to occur, and poor resolution of nmr data in time domain
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[0025]FIG. 2 depicts a borehole 10 which has been drilled in a typical fashion into a subsurface geological formation 12 to be investigated for potential hydrocarbon producing reservoirs. An NMR logging tool 14 suitable for use with the present invention has been lowered into the hole 10 by means of a cable 16 and appropriate surface equipment represented diagrammatically by a reel 18 and is being raised through the formation 12 comprising a plurality of layers 12a through 12g of differing composition, to log one or more of the formation's characteristics. The NMR logging tool is provided with bowsprings 22 to maintain the tool in an eccentric position within the borehole with one side of the tool in proximity to the borehole wall. The permanent magnets used for providing the static magnetic field are indicated by 23 and the magnet configuration is that of a line dipole. Signals generated by the tool 14 are passed to the surface through the cable 16 and from the cable 16 through ano...
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