古地磁学岩心定向方法回顾  

Review of paleomagnetic core orientation method

作　　者：谢基海 葛坤朋[1,2] 徐慧茹 邓居智 XIE Ji-hai;GE Kun-peng;XU Hui-ru;DENG Ju-zhi(State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China;School of Geophysics and Measurement-Control Technology,East China University of Technology,Nanchang 330013,China;Institute of Geophysics and Geomatics,China University of Geosciences,Wuhan 430074,China)

机构地区：[1]东华理工大学核资源与环境国家重点实验室,南昌330013 [2]东华理工大学地球物理与测控技术学院,南昌330013 [3]中国地质大学地球物理与空间信息学院,武汉430074

出　　处：《地球物理学进展》2020年第3期906-917,共12页Progress in Geophysics

基　　金：国家自然科学基金(41604059,41804116,41964003);江西省研究生创新基金(YC2018-S338);江西省核地学数据科学与系统工程技术研究中心基金(JELRGBDT201801);东华理工大学实验技术开发项目(DHSY-201803)联合资助.

摘　　要：岩心定向在矿产资源开发中具有重要意义.由于油田和矿业钻孔上的岩心大多为无定向岩心,无法准确识别裂缝等信息,因此需对岩心进行定向.岩心定向方法主要包括摄影工具、倾角仪法、钻孔成像技术、全岩心扫描技术、古地磁法等5种方法,相比于前4种方法,古地磁法具有经济、效率、精度较高等优点.本文首先综述了5种岩心定向方法的优缺点,阐述了古地磁法岩心定向的前提条件和定向原理.同时介绍了古地磁法岩心定向的流程,随后论述了岩石磁学对岩心定向的作用.继而重点阐述了岩心定向结果可靠性检验方法,主要包括露头检验、磁倾角检验、古地磁极位置检验等3种直接检验方法和间接检验.最后对古地磁法岩心定向的前景提出了展望.Core orientation is of great significance in the development of mineral resources.However,most cores are nonoriented cores in the oilfield and mining borehole,which makes it impossible to identify information such as cracks,so we have to orient the core.Core orientation mainly includes five methods,such as multishot orientation,dipmeter method,borehole imaging technology,whole-core scanning technology,and paleomagnetic method.Compared with the first four methods,the paleomagnetic method has the advantages of economy,efficiency,and high precision.First,this paper reviews the advantages and disadvantages of five core orientation methods and the preconditions and principles of paleomagnetic core orientation are expounded.At the same time,the process of paleomagnetic core orientation is introduced.Then,the effect of rock magnetism on core orientation is expounded.Next,this paper focuses on a method for reliability test in core orientation,including outcrop test,magnetic inclination test,paleomagnetic pole position test and indirect test.Finally,the prospect of paleomagnetic core orientation is proposed.

关 键 词：岩心定向 古地磁学 岩石磁学 可靠性检验 

分 类 号：P318[天文地球—固体地球物理学]