Identification of Light Oil in 2D NMR Spectra of Tight Sandstone Reservoirs by Using L1/L2 Two-Parameter Regularization
Identification of Light Oil in 2D NMR Spectra of Tight Sandstone Reservoirs by Using L1/L2 Two-Parameter Regularization
复制标题
L1/L2二参数正则化识别致密砂岩油藏二维核磁共振谱中的轻质油
DOI:
10.1021/acs.energyfuels.9b02114
复制
发表时间:
2019-10
期刊:
影响因子:
5.3
通讯作者:
Huifeng Li
中科院分区:
文献类型:
--
作者:
Xiangning Meng;Ranhong Xie;Hui Jia;Huifeng Li
This work presents L1/L2 two parameters regularization as an efficient technique for the identification of light oil in the two dimensional (2D) nuclear magnetic resonance (NMR) spectra of tight sandstone reservoirs. 2D NMR T2-T1 distribution model containing light oil, natural gas and formation water is constructed. 2D NMR echo trains are obtained by means of multi waiting time Carr, Purcell, Meiboom, and Gill pulse sequence. A detailed analysis of the ill-posed characteristics to obtain 2D NMR specturm is given using Picard curve. The identification abilities of L1/L2 two parameters regularization and three other techniques are compared in detail. The paper demonstrates that even if the signal-to-noise ratio (SNR) is around 100, it is still very difficult to obtain 2D NMR spectrum. Light oil cannot be distinguished using Tikhonov regularization and truncated singular value decomposition. Both L1/L2 two parameters regularization and L1 norm regularization can identify light oil, while the identification ...
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