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地震资料的逆时偏移是基于双程波发展起来的适合复杂波场的高精度成像方法.松辽盆地北部深层的致密砂砾岩是天然气勘探的重点领域,受上覆火山岩地层的屏蔽影响,加之地质构造复杂,使得该地区的地震波场特征复杂.在传统保幅处理的基础上,对研究区进行表层Q的吸收衰减补偿,可有效展宽地震资料的频带;另外,基于网格层析方法和Kirchhoff深度偏移完成深度域的速度模型建立,将预处理后的炮记录和深度域速度模型作为输入,应用GeoEast-Lightning软件的逆时偏移方法完成了研究区三维地震资料的逆时偏移处理,成像效果较以往Kirchhoff积分法叠前深度偏移有较为明显改善,成像数据体可用于后续构造解释和综合地质研究中,所形成的成像处理流程可在大庆探区推广应用.
The inverse time migration of seismic data is based on the high accuracy imaging method developed for two-way wave for complex wave fields.The deep tight sand and conglomerate in the northern part of Songliao Basin is the key area of natural gas exploration. Affected by the shield of overlying volcanic strata, In addition, due to the complicated geological structure, the seismic wavefield in the area is complex. Based on the traditional amplitude-preserving treatment, the absorption attenuation attenuation of the surface Q in the study area can effectively widen the seismic data band. In addition, based on the grid tomography method And Kirchhoff depth migration to complete the depth domain velocity model establishment, the preprocessed gun record and depth domain velocity model as input, using the GeoEast-Lightning software inverse time migration method to complete the study area of the reverse seismic data Compared with Kirchhoff integral method, pre-stack depth migration has been obviously improved. The imaging data body can be used in subsequent tectonic interpretation and comprehensive geological research. The formed imaging processing flow can be popularized and applied in Daqing exploration area.