| 地层渗透率与水合物含量关系的模拟研究(英文) |
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| 引用本文： | 赵倩,邓克俊,刘学伟.地层渗透率与水合物含量关系的模拟研究(英文)[J].应用地球物理,2011,8(2):101-109. |
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| 作者姓名： | 赵倩 邓克俊 刘学伟 |
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| 作者单位： | 中国地质大学; |
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| 基金项目： | funded by National Basic Research Program of China(973Program,No.2009CB219505) |
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| 摘 要： | 本文通过人工变换T2分布和建立管-球模型模拟法研究含水合物地层渗透率与水合物含量之间的关系。首先,在渗透率的模拟试验中,我们改变了束缚水与可动水的比例、总孔隙度以及与之关联的T2分布。试验结果表明,相对渗透率与水合物含量之间的关系受到这些因素的制约。随后,我们用管-球模型表示水合物生长的孔隙空间,并把水合物的生长过程看成是向孔隙空间随机扔小球的过程。在此过程中,采用两种方法计算渗透率,一是Schlumberger’sT2公式(即SDR模型),二是Darcy定律与Poiseuille流动方程相结合的方法。前人的实验研究表明,在一定的水合物含量范围内,渗透率基本保持不变。以此为参考,我们将计算结果与之进行比较。我们发现,采用SDR模型时,渗透率的数值模拟曲线与Masuda模型N=15时的结果相近。而采用Darcy定律时,渗透率模拟值较高,但与实验结果的趋势相一致,都会出现渗透率的平直阶段。尤其,当水合物晶体在孔隙体内优先生成时,优先的概率越高,渗透率的平直范围越大。
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| 关 键 词： | 含水合物地层 渗透率 NMRT2分布 |
A simulation study of formation permeability as a function of methane hydrate concentration |
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| Qian Zhao,Keh-Jim Dunn,Xue-Wei Liu.A simulation study of formation permeability as a function of methane hydrate concentration[J].Applied Geophysics,2011,8(2):101-109. |
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| Authors: | Qian Zhao Keh-Jim Dunn Xue-Wei Liu |
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| Institution: | Zhao Qian1,Dunn Keh-Jim1,and Liu Xue-Wei11.China University of Geosciences,Beijing 100083,China. |
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| Abstract: | We modeled and studied the permeability of methane hydrate bearing formations as a function of methane hydrate concentration by artificially varying the T2 distribution as well as using a tube-sphere model.We varied the proportion of irreducible and movable water as well as the total porosity associated with the T2 distribution and found the normalized permeability as a function of methane hydrate concentration is dependent of these variations.Using a tube-sphere model,we increased the methane hydrate conce... |
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| Keywords: | Methane hydrate bearing formation permeability NMR T2 distribution |
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