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DOI | 10.1029/2018GL078304 |
In Situ Permeability and Scale Dependence of an Active Accretionary Prism Determined From Cross-Borehole Experiments | |
Kinoshita, C.1; Saffer, D. M.2,3 | |
2018-07-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:14页码:6935-6943 |
文章类型 | Article |
语种 | 英语 |
国家 | Japan; USA |
英文摘要 | Permeability controls fluid flow in the Earth's crust and affects a wide range of processes including advective transport and pore pressure generation. However, in situ measurements of permeability are few, especially in active tectonic settings or at scales relevant to regional flow. We analyze formation fluid pressure records from oceanic boreholes in the Nankai accretionary prism offshore southwest Japan, focusing on unexpected responses to drilling operations conducted at boreholes similar to 100m to the northeast. We develop a 2-D numerical model of transient fluid flow and conduct a parametric grid search to define hydraulic diffusivity. A value of 0.19-0.46 m(2)/s (corresponding to a permeability of 9.8x10(-13) to 2.4x10(-12) m(2)) yields the best fit to observed pressure responses. Together with laboratory measurements on core samples and drillstrem tests reported in previous studies, our analysis indicates a strong scale dependence of permeability, likely reflecting the presence of permeable faults and fractures. |
英文关键词 | permeability pressure cross-hole experiments scale dependence oceanic borehole Nankai |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000442582100021 |
WOS关键词 | PHILIPPINE SEA PLATE ; SUBDUCTION ZONE ; NANKAI TROUGH ; FLUID-FLOW ; PORE PRESSURE ; EARTHQUAKES ; FAULT ; MECHANICS ; DECOLLEMENT ; STRESS |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/28964 |
专题 | 气候变化 |
作者单位 | 1.Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki, Japan; 2.Penn State Univ, Dept Geosci, University Pk, PA 16802 USA; 3.Penn State Univ, Ctr Geomech Geofluids & Geohazards, University Pk, PA 16802 USA |
推荐引用方式 GB/T 7714 | Kinoshita, C.,Saffer, D. M.. In Situ Permeability and Scale Dependence of an Active Accretionary Prism Determined From Cross-Borehole Experiments[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(14):6935-6943. |
APA | Kinoshita, C.,&Saffer, D. M..(2018).In Situ Permeability and Scale Dependence of an Active Accretionary Prism Determined From Cross-Borehole Experiments.GEOPHYSICAL RESEARCH LETTERS,45(14),6935-6943. |
MLA | Kinoshita, C.,et al."In Situ Permeability and Scale Dependence of an Active Accretionary Prism Determined From Cross-Borehole Experiments".GEOPHYSICAL RESEARCH LETTERS 45.14(2018):6935-6943. |
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