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The Modul Making of Core-Orientator using Remanent Magnetization measured Equipment with High-Tempwrature Superconductive Magnetic Schield

高温超导磁屏蔽剩磁测量装置铁芯定向器模块制作

基本信息

批准号：
06555308
负责人：
NAKATSUKA Katsuo
金额：
$ 6.08万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

The oriented core sample is useful for the evaluation of the potential of geothermal fields and estimation of stress fields in the earth crust. Oriented core samples which are obtained by usual methods become more difficult and expensive when the drilling has be carried out at more deeper levels. It is believed that the orientation of the core samples is possible by measureing the remanent magnetization. Therfore we have designed the remanent magnetization units which operate at noise level of 0.1n T and incoparative the thermal demagnetization equipment. The sample core isolate from the external magnetic fields by placing a magnetic schilds made of Bi-Sr-Ca-Cu-O superconductive oxides that doas the schield capacity of 10^<-4> due to Mysner effect.The thermal demagnetization was carried out using ultrared ray furnance. The core sample was placed in a cupper cell and packed with glass wool to obtain minimum temperature defference between the top and bottom of the core during thermal demagnetization.The ultrasonic morter was select to drive sample rotation. Ultrared ray furnance and ultrasonic moter are both non-magnetic. Using this equipment, we measured the remanent magnetization of andesite from Kurikoma Mt.. The pertial remanent magnetization of andesite indicate that the magnetization os reversal and in the derection of NS to N8W.The results prove the validity of the modal equipment.

定向岩心样品可用于评价地热田潜力和估计地壳应力场。当在更深的水平上进行钻探时，通过通常方法获得的定向岩心样品变得更加困难和昂贵。认为通过测量剩磁来确定岩心样品的取向是可能的。为此，我们设计了一种工作在0.1nT噪声级的剩磁装置，并与热退磁装置相结合。在样品芯上放置Bi-Sr-Ca-Cu-O四氧化物磁屏蔽层，由于Mysner效应，磁屏蔽层的磁容量为10 Ω，使样品芯与外磁场隔离<-4>，用红外光谱进行热退磁。将岩心样品置于铜室中，用玻璃棉包裹，使热退磁时岩心上下温差最小，并选用超声波研磨器驱动样品旋转。红外线屏蔽和超声波电机都是无磁的。利用该装置对栗驹山安山岩的剩磁进行了测量。安山岩的平均反磁化强度表明，安山岩的反磁化方向为NS到N8 W，证明了模型装置的有效性。