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为了了解下扬子地区地下有利区带圈闭构造和地层分布,中石化石油工程地球物理公司在该地区进行了二维宽线地震施工.下扬子地区特点主要体现农业养殖区、工厂区和居民区等多种地表条件,地表岩性分布不同.其地表条件导致了地震数据存在有静校正问题和低信噪比问题,给反射地震的叠加成像和地质构造解释提出了巨大挑战.针对这些问题,我们开发了宽线地震共反射面元叠加技术,提出了宽线地震共反射面元叠加解决实际问题的处理流程和创新手段,使用这些手段对下扬子地区的宽线地震数据进行了处理测试.与常规共中心点叠加方法相比,共反射面元叠加提高了地震剖面的信噪比,增强了有效反射界面的连续性,特别是中深层成像清楚,成像细节清晰,为后续的地震构造解释和层位划分奠定了基础.
To understand the structural and stratigraphic distribution of favorable subtropical zones in the Lower Yangtze region, Sinopec Petroleum Engineering Geophysical Company carried out a two-dimensional wide-line seismic construction in this area.The features of the Lower Yangtze region mainly include agricultural aquaculture areas, factory areas and residential areas Various surface conditions and surface lithology distribution are different, and the surface conditions lead to the problems of static correction and low signal-to-noise ratio in seismic data, which pose a great challenge to the superimposed imaging of seismic reflection and interpretation of geological structure. This paper develops a technique of superposition of broadband reflections by wide-line seismic reflection and presents the processing flow and innovative methods to solve the practical problems of the overlapped reflection of wide-line seismic. Using these methods, the wide-line seismic data in the Lower Yangtze area are processed and tested. Compared with the common center point stacking method, the total reflection element superposition enhances the signal-to-noise ratio of the seismic profile and enhances the continuity of the effective reflection interface. In particular, the imaging of the middle and deep layers is clear, the imaging details are clear, and the subsequent seismic interpretation and Layers laid the foundation.