微磁异常的石油地质意义

Significance of micromagnetic anomaly in petroleum geology

利用波数域回返延拓方法对L区航空磁测资料进行处理．能够从强背景场中分离出微磁异常带。L区发现三个有规律分布的微磁异常带。其中，北部异常带可能由二叠系火山岩引起，南部异常带可能和沉积岩中磁性层有关，中都异常带与已知油气田相吻合。据现有资料处理结果表明，中部微磁异常带还从已知油田继续向东延伸，预测此延伸部位可能是寻找油气最有利的部位。

Micromagnetic anomaly can be separated from strong background field by applying wavenumber-domain up-down continuation to the processing of aeromagnetic data in L area. We have found three regular micromagnetic anomaly belts in the area: the north anomaly belt due to Permian volcanic rocks,the south anomaly belt resulting from magnetic layer in sedimentary series,and the mid anomaly belt that is usually coincident with known oil fields. Data processing result shows that the mid micromagnetic anomaly belt stretches eastward to the place far away from the known oil fields,so the stretch part of the belt may be the most favourable area where hydrocarbon accumulations will be discovered hereafter.