地震成像技术在松辽盆地北部深层的应用研究

An Applied Research of Seismic Imaging Technique on Deep Part Prospecting in Northern Songliao Basin

松辽盆地北部某地区深部地层倾角较陡,地下构造复杂,以叠加为基础的叠后时间偏移成像模糊。通过对深层复杂地质叠前时间偏移成像关键技术的研究,提出了综合建模静校正方法,以克服处理中出现的长波长静校正问题及连片处理中闭合差问题,并有针对性地采用了叠前噪声压制技术、球面扩散补偿、地表一致性振幅补偿及剩余振幅补偿技术、多域统计地表一致性反褶积技术和Kirchhoff叠前偏移算法。结果表明,采用上述组合地震数据处理技术,可有效提高松辽北部深层复杂地质体的偏移成像质量,为准确识别其火山岩储层和火山岩气藏圈闭提供可靠的技术支撑。

The strata dips in deep part of the XJWZ area,northern Songliao Basin are rather steep,underground structures are complicated,thus bring on obscure poststack time migration imaging based on stacking.Through research on key technology in prestack time migration imaging under complicated deep part geological conditions,a method of comprehensive modeling statics put forward to control closures come forth in long wavelength statics and multi-survey joint processing,and purposely using prestack noise cancellation,spherical dispersion compensation,surface consistent amplitude compensation and residual amplitude compensation,multi-domain statistical surface consistent deconvolution and Kirchhoff prestack migration algorithm technologies.Practical results have demonstrated that to use above combined seismic data processing technologies can improve northern Songliao Basin deep part complicated geologic body＇s migration imaging quality effectively,and provide reliable technical support to identify volcanic rock reservoirs and volcanic rock gas reservoir traps.