T2分布提供了有關儲層巖石和流體性質非常有用的信息，這也是NMR測井圖上的基本輸出。NMR測井的其他輸出大部分可根據(jù)T2分布計算出來。根據(jù)NMR回波數(shù)據(jù)計算出的T2分布可用來計算NMR總孔隙度、束縛流體孔隙度和自由流體孔隙度，也能用來計算滲透率、評價儲層質量。通過將自旋回波信號擬合成大約3O個單指數(shù)方程來計算T2分布。每個指數(shù)方程都具有幅度A(T2)和相應的衰減時間T2。擬合過程由數(shù)學反演技術來實現(xiàn)。反演結果是幅度A(T2)，單位為孔隙度單位，對應于每個T2值。A(T2)對T2的半對數(shù)圖稱為 分布。T2分布以下的面積等于NMR總孔隙度。
上一頁 [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [30] [31] [32] [33] [34] [35] [36] [37] [38] [39] [40] [41] [42] [43] [44] [45] [46] [47] [48] [49] [50] [51] [52] [53] [54] [55] [56] [57] [58] [59] [60] [61] [62] [63] [64] [65] [66] [67] [68] [69] [70] [71] [72] [73] [74] [75] [76] [77] [78] [79] [80] [81] [82] [83] [84] 下一頁
| 發(fā)表評論 | ||
