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Rask, flerfrekvent NMR-akkvirering av T1- og T2-type, for grunnformasjonsevaluering med MWD-verktöy eller verktöy i ledningsvaier
Rask, flerfrekvent NMR-akkvirering av T1- og T2-type, for grunnformasjonsevaluering med MWD-verktöy eller verktöy i ledningsvaier
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机译:快速,多频NMR采集T1和T2型,用于使用MWD工具或电缆中的工具进行基本地层评估
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摘要
Nuclear magnetic resonance measurement of a medium are made using a tool with a static magnetic field having a gradient. The nuclear spins of the medium are magnetically polarized using the static magnetic field. Data are acquired from at least three sensitive volumes of the medium using an interleaved sequence of pulses at three different non-overlapping frequencies. At each frequency, a number of sub-sequences of a saturation pulse, a recovery pulse and at least one refocusing pulse are used. The saturation times between the saturation pulse and the recovery pulse for the sub-sequences are selected from a distribution of values between a minimum time to a maximum time to enable determination of T1 and T2 spectra over a wide range of values. Repetitions of sub-sequences having the same saturation at one or more frequencies may be carried out with phase alternation of the recovery pulse phases.
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