Advanced CORKs for ODP Drilling in the Nankai Trough: Sustained Observations of Subsurface Pressures in an Accretionary Prism

推荐的项目是两个先进循环消除改造套件（A-CORKs）的采购和仪器成本，将安装在海洋钻井计划（ODP） 196号法规上。这些仪器将用于对南开槽俯冲带的三个地层区域——俯冲板块的大洋基底、增生楔与俯冲地壳之间的滑脱以及增生楔内部主要断层的地下流体压力进行持续观测。先进的软木塞使用多个封隔器管柱来独立密封井眼的多个区域，而原始的软木塞设计在整个井眼长度上集成了流体压力测量。A-CORKs还将允许对现场流体进行最终采样。该提案是一个更大的多国努力的一部分，包括加拿大和ODP的资源，设计和制造a - corks，安装a - corks和相关的仪器串，由ODP JOIDES Resolution钻井船提供日本资助，以及在同一巡航中进行相关的随钻测井（LWD）。后续数据恢复和仪器维修的船舶和潜水作业将由日本技术机构JAMSTEC提供资金

Becker 00-83156Recommended project is for acquisition and instrumentation costs for two Advanced Circulation Obviation Retrofit Kits (A-CORKs) that will be installed on Ocean Drilling Program (ODP) Leg 196. These will be used for sustained observations of subsurface fluid pressures in three stratigraphic regions of the Nankai Trough subduction zone- the oceanic basement of the subducting plate, the decollement between the accretionary wedge and the subducting crust, and in major faults within the accretionary wedge. The advanced CORKs use multiple packer strings to independently seal off several regions of the borehole, in contrast to the original CORK design that integrated fluid pressure measurements over the entire borehole length. The A-CORKs will also allow for eventual sampling of in-situ fluids. This proposal is part of a larger, multi-national effort that includes Canadian and ODP resources in designing and fabricating the A-CORKs, installation of the A-CORKs and associated, Japanese-funded instrument strings by the ODP JOIDES Resolution drillship, and related logging-while-drilling (LWD) occurring in conjunction on the same cruise. Ship and submersible operations for follow-up data recovery and instrument servicing will be funded by the Japanese technology agency JAMSTEC.***