低频信号在玄武岩地区深层成像中的应用研究

Application of low-frequency signals to imaging of deep layers in subbasalt areas

以江汉油田陵北玄武岩地区深层成像问题为例,分析了玄武岩地区深层成像困难的主要原因,并在此基础上利用地震波波场数值模拟技术模拟了玄武岩地区地震波的传播规律.结果表明:非均匀性很强的高速玄武岩地层会对常规频率勘探地震波场产生散射和屏蔽作用;长波长信号具有较强的穿透非均质体的能力.

A case study was performed of imaging of Linbei subbasalt area at Jianghan Oil Field. Some difficulties in imaging of deep layers were analyzed, and the law of seismic wave propagation in subbasalt areas was studied with the technique of numerical modeling of seismic wave fields. The result shows that the high-velocity subbasalt layer with great inhomogeneity has scattering and shielding effect on wavelets of conventional frequency for inspection of seismic wave fields, and that low-frequency signals have powerful capacity in penetrating subbasalt heterospheres.