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岩石在现代地磁场中获得的粘滞剩磁（VRM）可以通过分离剩磁低温分量获得，并且它与现代地磁场方向一致．因此，通过提取岩芯剩磁的低温分量，可以恢复岩芯的现代磁坐标，进而确定岩芯在现代地理坐标中的位置．本文对吐哈油田，长庆油田岩芯及地表露头样品作了系统热退磁分析，讨论了剩磁低温分量与现代地磁场关系，建立了岩芯方位古地磁学定向方法，并将这种方法用于长庆油田钻井岩芯定问及裂缝方位确定．通过对长庆油田40口井的含裂缝岩芯的走向，揭示了油层地下裂缝展布方位．
Viscous remanence (VRM) obtained by rock in modern geomagnetic field can be obtained by separating the residual magnetic remanence, and it is consistent with the direction of modern geomagnetic field. Therefore, by extracting the low-temperature components of the residual magnetism of the core, the modern magnetic coordinates of the core can be recovered and the position of the core in the modern geographical coordinates can be determined. In this paper, the thermal demagnetization analysis of the core and surface outcrop samples of Turpan-Hami Oilfield and Changqing Oilfield was systematically studied. The relationship between the low temperature components of residual magnetism and the modern geomagnetic field was discussed, and the paleomagnetic orientation method of the core orientation was established. Used for determination of drilling core and crack orientation in Changqing Oilfield. By revealing the fracture orientation of the fractures in 40 wells in Changqing Oilfield,