陆上非重复性时移地震资料处理存在的问题与对策

A油区先后进行了两次三维地震观测,二次地震施工的坐标分带、观测系统、面元网格、覆盖次数等诸多采集因素均不相同。分析了在这种非重复性采集条件下进行时移地震资料处理存在的问题,并针对去除两期地震数据采集不一致性所造成的不利影响和消除非油气藏因素引起的地震响应变化,给出了针对性的技术思路和处理对策。主要论述了观测因素一致性处理,相位校正、谱整形、匹配滤波等高保真的精细处理,独立处理与融合处理,以及通过过程质量控制优化地震数据的可重复性。对A油区前、后两期非重复性采集三维地震资料进行了叠前、叠后一致性处理和质量控制,获得了较可靠的剩余振幅数据体。

3D seismic survey has been carried out in block A for two times with different acquisition parameters such as coordinates,geometries,fold and bin grids.We analyzed the existing problems for the time-lapse seismic data processing with such kind of non-repeated acquisition conditions.Moreover,aiming at the influence caused by the inconsistency of the non-repeated time-lapse survey and the variation of seismic responses caused by the factors except reservoirs,we proposed technical clue and processing strategies.We mainly focused on the consistency processing of survey factors,high-fidelity processing on phase correction,spectrum shaping and match filtering,independent processing and fusion processing,as well as procedure quality controlling for optimizing the repeatability of seismic data.By prestack and poststack consistency processing and quality controlling on the non-repeated time-lapse seismic data in block A,reliable residual amplitude data volume has been achieved.