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    • 4. 发明授权
    • NMR logging of natural gas reservoirs
    • 天然气储层的核磁共振测井
    • US6094048A
    • 2000-07-25
    • US993138
    • 1997-12-18
    • Harold J. VinegarRidvan AkkurtPierre Nazareth Tutunjian
    • Harold J. VinegarRidvan AkkurtPierre Nazareth Tutunjian
    • G01R33/44G01V3/32G01V3/00
    • G01V3/32G01N24/081
    • A method is provided to estimate the pore volume of a formation occupied by hydrocarbon phase or phases, the method comprising the steps of: obtaining a first pulsed NMR log of the formation, the pulse sequence of the first NMR log comprising an initial 90.degree. radio frequency pulse, followed by a series of 180.degree. radio frequency pulses starting at a time period t.sub.cp1 after the initial 90.degree. pulse, and the series of pulses comprising magnetic pulses each separated by a time period 2t.sub.cp1 ; obtaining a second pulsed NMR log of the formation, the pulse sequence of the second NMR log comprising an initial 90.degree. radio frequency pulse, followed by a series of 180.degree. pulses starting at a time period t.sub.cp2 after the initial 90.degree. pulse, and the series of 180.degree. pulses comprising radio frequency pulses each separated by a time period 2t.sub.cp2 wherein the time t.sub.cp2 is a time that is different from t.sub.cp1 by an amount of time sufficient to separate resultant peaks of transverse relaxation times attributable to the hydrocarbon phase or phases within the formation; and determining, from the first and the second NMR logs, the pore volume of a formation occupied by hydrocarbon phase or phases within the formation. In a preferred embodiment, pore volume occupied by hydrocarbon gas is determined, and t.sub.cp2 is a time that is greater than that which results in the measured transverse relaxation time of the hydrocarbon gas being less than about 2.times.10.sup.-3 seconds and t.sub.cp1 is a time that is less than that which results in the measured transverse relaxation time of the hydrocarbon gas being greater than about 4.times.10.sup.-3 seconds.
    • 提供了一种用于估计烃相或相的占地孔隙体积的方法,该方法包括以下步骤:获得地层的第一脉冲NMR对数,第一NMR对数的脉冲序列包括初始90°无线电 在初始90度脉冲之后的时间段tcp1处开始一系列180度的射频脉冲,并且包括磁脉冲的一系列脉冲,每个脉冲间隔时间为2tcp1; 获得地层的第二个脉冲NMR对数,第二个NMR对数的脉冲序列包括初始的90°射频脉冲,接着是在初始90°脉冲之后的时间段tcp2开始的180°脉冲串, 180°脉冲系列包括各自分开时间段2tcp2的射频脉冲,其中时间tcp2是不同于tcp1的时间足以将所得的归因于烃相或相的横相弛豫时间的峰值分离 形成; 并且从第一和第二NMR日志确定由地层内的烃相或相所占据的地层的孔体积。 在优选的实施方案中,确定烃气体占据的孔体积,并且tcp2是大于导致烃气体的测量的横向弛豫时间小于约2×10-3秒的时间,并且tcp1是 小于导致烃气体的测量的横向弛豫时间大于约4×10 -3秒的结果。