北极格陵兰岛东南部玄武岩区地震成像

北极格陵兰岛东南部JMY地区强屏蔽玄武岩地层广泛分布，其下地层成像困难。通过基于声波方程数值模拟厘清了两个期次不同类型、不同厚度玄武岩地层的屏蔽作用与地震低频信号之间的关系，并将分析结果用于指导宽频地震资料处理，提升了中深地层地震成像精度和可靠性。研究结果表明，在多期互层的始新世晚期玄武岩地层屏蔽下，低频信号穿透力强，有利于改善中深层的地震成像效果，而在渐新统厚层溢流相玄武岩下地震成像品质较差，低频信号较弱。以数值模拟结果为指导，对实际资料进行了加强低频的宽频地震资料处理，即以鬼波压制为核心的配套宽频处理技术极大地改善了该区玄武岩下中深地层成像效果。处理结果改变了对该区中生代侏罗纪烃源岩厚度及其分布的认识，有利于该区的油气远景评价，为进一步勘探打下良好的基础。

Sub-basalt seismic imaging in southeastern Greenland,Arctic

Volcanic basalts are widely distributed in JMY area of southeastern Greenland,Arctic.It is often compromised in sub-basalt imaging.Numerical simulation results show that low frequency is useful for geometrical characteristics and physical properties of the Mesozoic sediments,which are covered by Eocene and Oligocene basalt.The ana-lysis results are used to guide the processing of broadband seismic data and protect low frequencies signal of deeper reflectors.It is noticeable that the data quality of deep data is improved by broad-band recording through ghost elimination.The results provide a more relieable interpretation,which reveal the thickness and distribution of Mesozoic sediments source,is conducive to the hydrocarbon exploration.