钻井岩心重定向的古地磁方法及其可靠性研究  

The paleomagnetic method applied to reorient core and its reliability

作　　者：李学森[1] 吴汉宁[2] 张小浩[3] 李秋实[3] 

机构地区：[1]胜利油田分公司物探研究院 [2]西北大学地质学系 [3]长庆油田油气开发中心

出　　处：《油气地球物理》2006年第2期27-32,共6页Petroleum Geophysics

摘　　要：依据在地理坐标系中岩心粘滞剩磁分量方向与现代地磁场方向相近(统计意义)的原则,提出了一种钻井岩心古地磁重定向新方法,并以四川江油地区的118块标准古地磁定向样品进行了验证。结果表明,利用新方法进行岩心重定向是可行的,它适合于各种类型井的取心,而且计算过程不受地层产状的约束,定向结果的可靠性依赖于其统计性即必须保证足够的测试样品数量。新方法特别适合于那些当初未考虑定向问题而现在又迫切需要重定向的钻井取心。Based on the principle that the direction of component of rock Viscous Remanent Magnetization （VRM） is statistically identical to that of modern magnetic field, a new paleomagnetic method, presented inthe paper, has been developed. The problem of reliability is discussed in detail while the method is applied to reorient 118 field oriented outcrop cores from Jiangyou, Sichuan, The result shows the method is feasible, suitable for all types ofcores, independentofstratumoccurrenceanditsreliability depends on the amount of tested cores for one sample. The method is suitable for the cores unoriented in the process of drilling, but need to be oriented in the present.

关 键 词：岩心 定向 古地磁 可靠性 

分 类 号：P618.510.2[天文地球—矿床学] TS103.33[天文地球—地质学]