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首页> 外文期刊>Journal of natural gas science and engineering >Determination of initial gas saturation in tight gas formations with NMR relaxometry measurements
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Determination of initial gas saturation in tight gas formations with NMR relaxometry measurements

机译：用NMR弛豫法测定致密气层中的初始气体饱和度

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The NMR relaxometry measurements are designed and applied to determine the initial gas saturation in tight gas formations. After a full-diameter core obtained by sealed coring technique has been cut into two sections, one is weighed and then put into the NMR apparatus to measure its NMR T-2 spectrum, while the other is used to obtain a core plug, and some clastic grains from its edge and center. Afterward these grains are weighed and their NMR T-2 spectra are measured. Subsequently, the full-diameter section, grains, and the core plug are dried with their weights measured. Then they are saturated with water to measure their weights and NMR T-2 spectra. It is found that the average initial gas saturations for three cores determined by weighting method are 41.87%, 38.59%, and 31.30%, respectively. From T-2 spectra at the initial state and saturated-water state, the average initial gas saturations for these cores could be reproduced with a relative error of 0.29%, 1.37%, and 0.40%, respectively. If the cores are invaded by drilling fluid or not transported or preserved well, the initial gas saturations still could be determined by NMR T-2 spectra of the cores at saturated-water state and T-2cutoff with a relative error of 7.86%, 3.28%, and 8.16%, respectively. (C) 2015 Elsevier B.V. All rights reserved.
机译：设计NMR弛豫测定法，并将其应用于确定致密气层中的初始气体饱和度。将通过密封取芯技术获得的全直径岩心切成两段后，将其中一个称重，然后放入NMR设备中以测量其NMR T-2光谱，而另一个用于获得岩心塞，还有一些边缘和中心有碎屑。之后，对这些颗粒进行称重，并测量其NMR T-2光谱。随后，将全直径部分，谷物和芯塞干燥，并测量其重量。然后将其用水饱和以测量其重量和NMR T-2光谱。发现通过加权法确定的三个岩心的平均初始气体饱和度分别为41.87％，38.59％和31.30％。从初始状态和饱和水状态的T-2谱图可以得出这些岩心的平均初始气体饱和度，相对误差分别为0.29％，1.37％和0.40％。如果岩心被钻井液侵入或没有被很好地运输或保存，则初始气体饱和度仍可以通过岩心在饱和水状态和T-2截止条件下的NMR T-2谱图来确定，相对误差为7.86％，3.28 ％和8.16％。 （C）2015 Elsevier B.V.保留所有权利。

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