塔里木盆地北部中、新生代钻孔岩芯古地磁研究──喜山期岩石重磁化与油气移聚

PALEOMAGNETIC STUDY OF THE MESOZOIC AND CENOZOIC BORE HOLE IN NORTH TARIM BASIN──HIMALAYIAN REMAGNETIZATION AND HYDROCARBON MIGRATION AND COLLECTION

对来自塔里木盆地北部５口钻井的部分中、新生代沉积岩岩芯样品进行了古地磁研究，通过对重磁化组分和特征剩磁组分与露头样品的比较，确定了井下样品的喜山期严重重磁化；并通过烃类分析和对磁性分选颗粒的扫描电镜观察，发现了与碳氢化合物有关的球形磁铁矿颗粒和具有黄铁矿格架颗粒的球形磁铁矿聚集体，从而认为重磁化与油气移聚相关，据此确认了喜山期的油气移聚．

Paleomagentic study has been made on part of the Mesozoic and Cenozoic sedimentary samples from five bore holes of Northern Tarim Basin.A serious Himalayian remagnetization is revealed in the hole samples by comparing its remagnetic and characteristic components with those of the field samples.With hydrocarbon analysis and Scanning and Transmission Microscope,it is observed that there are spherical magnetite particles which were relevent to hydrocarbon and the replacement of pyrite framboids by magnetite.So it is concluded that the remagnetization is associated with the hydrocarbon migration and accumulation,therefore,the Himalayian hydrocarbon migration and accumulation is also confirmed.