Along-strike fault core thickness variations of a fault in poorly lithified sediments, Miri (Malaysia)
Along-strike fault core thickness variations of a fault in poorly lithified sediments, Miri (Malaysia)
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DOI：
10.1016/j.jsg.2018.08.012
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发表时间：
2018-11
影响因子：
3.1
通讯作者：
Silvia Sosio De Rosa;Z. Shipton;R. Lunn;Y. Kremer;T. Murray
中科院分区：
文献类型：
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作者：
Silvia Sosio De Rosa;Z. Shipton;R. Lunn;Y. Kremer;T. Murray
断层阻碍流体流动的程度取决于其最具渗透性的点。必须利用确定包含可传递断层岩的断层面区域的过程来产生跨断层流体流动的可靠预测。我们利用马来西亚美里的一个研究场地，详细调查了断层核厚度沿走向和下倾的变化，并量化了富粘土断层核中不连续性的风险，确定了四种断层核类型：片理化富粘土断层核、混乱富粘土断层核、封闭的桑迪剪切带和桑迪角砾岩。我们进行了地质统计学分析，显示出超过3米的规模的相关性，这表明存在的“补丁”的薄和厚的断层核心一般小于3米的长度在profile.We解释这种几何形状的叠加两个或两个以上的不同的变形过程在一个较小的和一个较大的规模。我们推测的过程，可以产生所观察到的厚度和成分的分布，特别是，过程中，可能会破坏贯穿的粘土丰富的核心。
The degree to which a fault will impede fluid flow is only as great as its most permeable point. Processes that determine areas of the fault surface containing transmissible fault rocks must be utilized to produce reliable predictions of cross-fault fluid flow. We use a study site in Miri, Malaysia, to investigate in detail the fault-core thickness variations along-strike and down dip, and to quantify the risk of discontinuities in the clay-rich fault core.Four fault-core types have been identified: foliated clay-rich fault core, chaotic clay-rich fault core, anastomosing sandy shear zones and sandy breccia. We performed a geostatistical analysis, showing a correlation over 3 m scale, suggesting the presence of ‘patches’ of thin and thick fault core generally less than 3 m in length in profile.We interpret this geometry as superimposition of two or more different deformation processes at a smaller and a larger scale. We speculate about the processes that could produce the observed distribution of thickness and composition, and in particular, processes that could have disrupted the through-going clay-rich core.