Water Permeability Evolution With Faulting for Unconsolidated Turbidite Sand in a Gas‐Hydrate Reservoir in the Eastern Nankai Trough Area of Japan
Water Permeability Evolution With Faulting for Unconsolidated Turbidite Sand in a Gas‐Hydrate Reservoir in the Eastern Nankai Trough Area of Japan
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日本南海海槽东部地区天然气水合物储层松散浊积砂的断层渗透率演化
DOI：
10.1029/2019jb018102
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Minagawa Hideki
中科院分区：
文献类型：
--
作者：
Kimura Sho;Ito Takuma;Noda Shohei;Kaneko Hiroaki;Suzuki Kiyofumi;Yasuda Hisato;Minagawa Hideki
沉积物中的天然气水合物有望成为一种非常规天然气资源。2013年和2017年，在日本东部南开海槽地区进行了海底天然气水合物砂层海上天然气开采试验。然而，这些断层油藏的渗透率随递进剪切作用的演化仍然是个谜。有必要了解断层在剪切作用下的行为，以及正应力如何影响渗透率的演化。在这里，我们通过实验室环切实验，研究了日本东部南开海槽地区疏松浊积砂岩中断层发育与渗透率降低之间的关系。在各应力状态下，随着剪切位移的增加，渗透率显著降低，当剪切位移达到10m时，渗透率进一步降低，剪切后渗透率比剪切前降低了3~4个数量级。剪切带和周围寄主沉积物中的颗粒破碎和压实作用取决于应力和矿物学。剪切带发育对浊积砂体断层渗透率的改善作用的研究成果，有望为今后天然气水合物储层的合理评价、生产模拟和开发策略提供直接的依据。
Gas hydrates in sediments are forecast to become an unconventional natural gas resource. In 2013 and 2017, an offshore natural gas production test in subseabed gas hydrate‐bearing sand layers was carried out in the eastern Nankai Trough area of Japan. However, permeability evolution with progressive shearing of these faulted reservoirs has remained enigmatic. It is necessary to understand fault behavior under shear, as well as how normal stress affects permeability evolution. Here, we examine the relationship between fault development and permeability reduction in unconsolidated turbidite sandy sediment from Japan's eastern Nankai Trough area using a laboratory ring‐shear experiments. At each stress condition, the permeability decreased significantly following shear displacements of ~0.2–0.5 m, gradually decreasing further with shear displacements up to 10 m. Permeability after shearing was reduced by 3 to 4 orders of magnitude compared to that before shearing. Grain crushing and compaction within the shear zone and surrounding host sediment are dependent on stress and mineralogy. The findings of the role of shear zone development in modifying fault permeability for turbidite sand are expected to contribute directly to rational evaluation of gas‐hydrate reservoir, production simulations, and development strategies in future studies.
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