Gas hydrate saturations estimated from pore-and fracture-filling gas hydrate reservoirs in the Qilian Mountain permafrost, China.
Gas hydrate saturations estimated from pore-and fracture-filling gas hydrate reservoirs in the Qilian Mountain permafrost, China.
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中国祁连山多年冻土孔隙和裂缝充填型天然气水合物储层的天然气水合物饱和度估算
DOI：
10.1038/s41598-017-16531-x
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发表时间：
2017-11-24
影响因子：
4.6
通讯作者：
Deng J
中科院分区：
文献类型：
--
作者：
Xiao K;Zou C;Lu Z;Deng J
天然气水合物饱和度的准确计算是天然气水合物资源评价的一个重要方面。采用有效介质理论（EMT模型）、基于两相介质理论的速度模型（TPT模型）和双组分层状介质模型（TCLM模型），研究了祁连山多年冻土孔隙型和孔隙型充注型储层的声波速度和天然气水合物饱和度特征。在孔隙充填型储层中，EMT模型模拟的纵波速度比TPT模型更符合实际测井资料。DKXX-13孔典型填孔储层的天然气水合物饱和度范围为13.0~ 85.0%，平均值为61.9%，与标准阿尔奇公式和实际岩心测试结果一致。TCLM模型模拟的P波相速度可以直接转换为充填储层中的P波横向速度。DKXX-19孔典型充注储层天然气水合物饱和度范围为14.1~ 89.9%，平均值为69.4%，与实际岩心测试结果一致。
Accurate calculation of gas hydrate saturation is an important aspect of gas hydrate resource evaluation. The effective medium theory (EMT model), the velocity model based on two-phase medium theory (TPT model), and the two component laminated media model (TCLM model), are adopted to investigate the characteristics of acoustic velocity and gas hydrate saturation of pore- and fracture-filling reservoirs in the Qilian Mountain permafrost, China. The compressional wave (P-wave) velocity simulated by the EMT model is more consistent with actual log data than the TPT model in the pore-filling reservoir. The range of the gas hydrate saturation of the typical pore-filling reservoir in hole DKXX-13 is 13.0~85.0%, and the average value of the gas hydrate saturation is 61.9%, which is in accordance with the results by the standard Archie equation and actual core test. The P-wave phase velocity simulated by the TCLM model can be transformed directly into the P-wave transverse velocity in a fracture-filling reservoir. The range of the gas hydrate saturation of the typical fracture-filling reservoir in hole DKXX-19 is 14.1~89.9%, and the average value of the gas hydrate saturation is 69.4%, which is in accordance with actual core test results.
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