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首页> 外文学位 >Permeability, clay mineralogy, and microfabric of fine-grained sediments from the Nankai trough and Shikoku Basin, offshore southwest Japan .
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Permeability, clay mineralogy, and microfabric of fine-grained sediments from the Nankai trough and Shikoku Basin, offshore southwest Japan .

机译：日本西南沿海南海海槽和四国盆地细颗粒沉积物的渗透性，粘土矿物学和微结构。

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摘要

The Nankai Trough, a convergent plate boundary between the subducting Philippine Sea plate and overriding Eurasian plate, is located off the coast of southwest Japan. This study covers the central portion of the Kumano transect, eastern province of the Nankai Trough, which consists of six morphotectonic zones, such as, from southeast to northwest, subduction inputs in the Shikoku Basin, trench zone, frontal thrust zone, imbricated thrust zone, megasplay fault zone, and Kumano forearc basin. The objectives of this study are: (1) to show how permeability varies as a function of burial depth, lithostratigraphy, and structural position within the Nankai Trough subduction zone; and (2) to document the permeability anisotropy and consider how it changes with microfabric and mineralogy. Constant-flow permeability tests were executed to measure permeability for vertical (along-core) and horizontal (cross-core) sections of twenty-one core samples collected during Integrated Ocean Drilling Program (IODP) Expeditions 316 and 333. Comparison of the horizontal (kh) to the vertical ( kv) permeability defines the anisotropy (k h/kv). Environmental scanning electron microscopy (ESEM) was used to image the fabric of samples in horizontal and vertical sections. The images were analyzed to compute the standard deviations and the indexes (i) of microfabric orientation. The relative clay mineral percentages in bulk sediment were calculated using previously analyzed X-ray diffraction data.;Samples from megasplay fault zone (IODP Sites C0004 and C0008) came from ∼51 to 381 meters below the sea floor (mbsf). The vertical permeability ranges between 1.61E-17 m2 and 1.86E-18 m2. Samples from frontal thrust zone (IODP Sites C0006 and C0007), were taken from ∼35 to 564 mbsf. The vertical permeability varies from 1.63E-15 m2 to 2.68E-19 m2. The values of horizontal permeability range between 2.11E-15 m2 and 3.32E-19 m2. Samples from Shikoku Basin (IODP Site C0011) came from ∼36 to 362 mbsf. The values of vertical permeability differ between 1.34E-17 m2 and 2.83E-19 m2, whereas the values of horizontal permeability show variations between 1.80E-17 m2 and 5.15E-19 m2. The ratio of horizontal to vertical permeability (kh/ kv) ranges between 0.02 and 19.90. The permeability and porosity values decrease as burial depth increases. However, the permeability doesn't show a statistically significant correlation with porosity. The vertical cut face shows better preferred orientation of grains than microfabric on the horizontal cut, which helps explain the anisotropy of permeability. Ratio of index of microfabric orientation does not show a significant correlation with permeability either direction or the anisotropy value. Vertical permeability values decrease as smectite and total clay minerals increase in abundance. Thus, the permeability and the anisotropy of permeability are not controlled by any single parameter.
机译：南海海槽位于俯冲的菲律宾海板块与上覆的欧亚板块之间的汇聚板块边界，位于日本西南海岸附近。这项研究涵盖了南海海槽东部省份熊野样带的中心部分，该区域由六个构造构造带组成，例如，从东南到西北，四国盆地俯冲输入，海沟带，前冲断带，带状冲断带，megasplay断裂带和Kumano前臂盆地。这项研究的目的是：（1）显示渗透率如何随埋藏深度，岩石地层学和南开海槽俯冲带内的构造位置而变化； （2）记录渗透率各向异性，并考虑其随微结构和矿物学的变化。进行了恒流渗透率测试，以测量在集成海洋钻探计划（IODP）第316和333次探险中收集的21个岩心样品的垂直（沿岩心）和水平（跨岩心）剖面的渗透率。垂直磁导率（khv）定义了各向异性（kh / kv）。使用环境扫描电子显微镜（ESEM）对水平和垂直截面的样品织物进行成像。分析图像以计算标准偏差和微织物取向的指标（i）。使用先前分析的X射线衍射数据来计算散装沉积物中相对粘土矿物的百分比。巨型散布断裂带（IODP站点C0004和C0008）的样本来自海床以下（mbsf）约51至381米。垂直渗透率介于1.61E-17 m2和1.86E-18 m2之间。从正面推力区（IODP站点C0006和C0007）采样，采样范围约为35至564 mbsf。垂直渗透率从1.63E-15平方米到2.68E-19平方米不等。水平渗透率的值在2.11E-15 m2和3.32E-19 m2之间。四国盆地（IODP站点C0011）的样本约为36至362 mbsf。垂直渗透率的值在1.34E-17 m2和2.83E-19 m2之间变化，而水平渗透率的值在1.80E-17 m2和5.15E-19 m2之间变化。水平渗透率与垂直渗透率之比（kh / kv）在0.02和19.90之间。渗透率和孔隙率值随埋深的增加而减小。但是，渗透率与孔隙率没有统计上的显着相关性。垂直切面比水平切面显示出更好的晶粒取向，这有助于解释渗透率的各向异性。微观取向指数的比值与方向或各向异性值的渗透率均无显着相关性。垂直渗透率值随绿土和全部粘土矿物的丰度增加而降低。因此，渗透率和渗透率的各向异性不受任何单个参数的控制。

著录项

  • 作者

    Ekinci, Mehmet Koray.;

  • 作者单位

    University of Missouri - Columbia.;

  • 授予单位 University of Missouri - Columbia.;
  • 学科 Marine Geology.;Sedimentary Geology.
  • 学位 M.S.
  • 年度 2012
  • 页码 156 p.
  • 总页数 156
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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