【摘要】 提出一个新的带通滤波器———延拓回返垂直二次导数,该滤波器可通过调节延拓回返高度及次数来达到调频目的,以突出勘探目标层段的信息.利用该技术对松辽盆地深层勘探程度最高的徐家围子断陷的航磁资料进行目标处理,与钻井资料对比表明,经处理后的航磁资料可以较好地反映火山岩的分布特征.以航磁资料为主结合钻井、地震资料预测了徐家围子三套火山岩的平面分布.指出航磁异常梯度带是火山岩储层的发育区带,近烃源岩或沟通烃源岩的航磁异常梯度带是火山岩天然气的富集区带.该认识对今后松辽盆地的勘探部署有着十分重要的指导意义,对我国其他地区的火山岩勘探也具有借鉴意义.更多还原

【Abstract】 By a newly proposed band filter,second derivative by multiple upward and downward continuation,which utilizes continuation height and iteration number to modulate frequency and enhance target layer information,the aeromagnetic data of Xujiaweizi depression,the most highly studied area in Songliao Basin,are processed to extract volcanic anomalies.From a comparison with drilling data, the extracted aeromagnetic anomalies correspond well to the distribution of volcanic rocks.According to the aeromagnetic anomalies in combination with drilling and seismic data the plan distribution of three volcanic formations is predicted.It is shown that aeromagnetic gradient belts near or connected to hydrocarbon source are gas-abundant zones with well-developed volcanic reservoirs.This point of view will play an important guiding role in gas exploration deployment in Songliao Basin,and even benefit gas exploration in other areas in China.更多还原