溱潼凹陷三维地震资料联片处理技术和效果分析

Unified processing for 3D seismic data from Qintong depression and effect analysis

中国石化石油勘探开发研究院南京石油物探研究所,江苏南京 210014

Institute of Geophysics Prospecting, SIN-OPEC Research Institute of Petroleum Exploration and Development,Nanjing 210014, China

溱潼凹陷工区包括10块三维地震资料,每块资料的处理成果数据之间在分辨率、信噪比、波组特征等方面存在较大差别,尤其是各区块结合部位存在着严重的边界效应,这给全区统一的构造解释、岩性处理和解释造成一定的困难。针对各区块处理成果资料之间存在的各种不一致性、边界效应及成像问题,采取了一系列措施。为确定处理方位角和扩展半径,采用了面元均化技术;为达到能量的一致性,采用了地表一致性,振幅补偿技术;为提高资料分辨率和统一全区频率,采用了不同的反褶积技术;为提高资料信噪比,采用了噪音自动识别与压制和动校CMP道集迭代校正等技术;为正确归位、准确成像,采用了DMO和偏移技术。这些技术的应用,解决了不同三维边界处的拼接问题,有效地提高了原三维资料的处理质量,得到了统一的成果数据体。

The unified data processing project involves in 10 3D seismic data sets. The great differences in the data sets in resolution, S/N ratio, and characters of wave groups, especially the boundary effects in the joint regions of different data sets bring about difficulties in u-nified structural interpretation, and lithologic processing and interpretation. This paper discusses the measures used in the unified data processing project. Re-binning is implemented for the determination of azimuth and extended radius. Surface consistent amplitude compensation is performed to attain energy consistency. A variety of deconvolution techniques are a-dopted to improve data resolution and unify the frequency on the whole area. Noise autodetection and suppression as well as iterative CMP gather moveout correction is carried out to enhance S/N ratio. DMO and migration are implemented for accurate positioning and imaging. Theses measures satisfactorily resolved the problem of piecing together different 3D data sets.