Evolution of sedimentary basins and accretionary prisms and quantitative analyses of fluid flow

该项目的目标是定量分析盆地演化，将其作为沉积、流体流动、机械压实和胶结作用之间的相互作用过程，包括流体沿着断裂带流动的Skills。研究期间，首席研究员从京都大学转到广岛大学，因此从本财政年度起增加了5名新成员，并主要使用转移到广岛大学的血管内变形和流体流动装置进行研究。（1）根据第三纪和第四纪沉积岩的运移性质的实验室测量，估算了台湾西北部、新泻盆地、足良平原、北方北海道的幌延地区和宫崎平原的地下渗透率和孔隙度结构。特别是，在台湾西北部的沉积和流体流动的竞争过程进行了分析，使用测量的传输特性， 关于我们 阐明了台湾油气田近十口生产威尔斯井异常孔隙压力发展过程，与实测孔隙假定分布定量吻合。(2)断层带对地下流体流动有着重要的影响，在实验室测定断层岩输运性质的基础上，确定了野岛断层、中央构造线断层和片谷断层的渗透率结构，并进行了高速摩擦实验，揭示了地震断层运动中摩擦热引起的显著弱化过程。(3)在美国犹他州的Arima-Takatsuki断层带、小Grand Wash断层和Salt Wash断层以及东爪哇的泥质喷发现场，认识到二氧化碳和甲烷等水溶性气体在促进流体快速流动中的重要作用。印度尼西亚水溶性天然气在二氧化碳捕获和储存（CCS）等许多问题中可能发挥非常重要的作用作为本研究的未来发展，需要对此进行系统的研究。少

The objective of this project has been to analyze basin evolution quantitatively as interacting processes among sedimentation, fluid flow, mechanical compaction and cementation, including the Skirts of fluid flow along fault zones. Head investigator moved from Kyoto University to Hiroshima University in the middle of the research period, so five new members were added from this fiscal year and researches were conducted using mostly an intravessel deformation and fluid-flow apparatus that were moved to Hiroshima University. The outcome from this fiscal year are three-folds: (1) Underground permeability and porosity structures of northwestern Taiwan, Niigata basin, Ashigara Plain, Horonobe area of northern Hokkaido and Miyazaki Plain were estimated based on laboratory measurements of transport properties of Tertiary and Quaternary sedimentary rocks. In particular, competing processes of sedimentation and fluid flow were analyzed in northwestern Taiwan using measured transport properties, … More elucidating the process of abnormal pore pressure developments that agrees quantitatively with measured pore presume distributions in nearly ten production wells in Taiwan gas and oil fields. (2) Fault zones dramatically affects underground fluid flow, and permeability structures of Nojima fault, Median Tectonic Line and Katagai fault were determined basal on laboratory measurements of transport properties of fault rocks Also, high-velocity friction experiments were conducted to reveal dramatic weakening processes due to frictional heating during seismic fault motion. (3) Significant role of water-soluble gases such as carton dioxide and methane in promoting rapid fluid flow was recognized in Arima-Takatsuki fault zone, little Grand Wash fault and Salt Wash fault in Utah, USA and mud eruption site in East Java, Indonesia Water-soluble gas may play very important role in many problems such as carbon dioxide capture and storage (CCS) and a systematic studies have to be conducted on this as a future development of this study. Less