CAJ | 학술논문

针对常规走时双曲线方程依据偏移距小于或等于反射界面深度的假设，以至于不适合长电缆的大偏移距和多覆盖次数采集方式的地震资料速度分析及时差动校正处理，提出了长排列非双曲线反射同相轴的动校正(NMO)方法，并且首次用于南海地震资料处理。该方法通过在常规时移双曲线方程引入2个 NMO 参数，即不均匀性参数 s 和各向异性参数η，使走时方程满足长电缆采集数据处理要求。模型试算及实际数据处理结果显示，大偏移距及陡倾角处的道集得到拉平，叠加后的剖面成像更清晰、信噪比更高。
침대상규주시쌍곡선방정의거편이거소우혹등우반사계면심도적가설，이지우불괄합장전람적대편이거화다복개차수채집방식적지진자료속도분석급시차동교정처리，제출료장배렬비쌍곡선반사동상축적동교정(NMO)방법，병차수차용우남해지진자료처리。해방법통과재상규시이쌍곡선방정인입2개 NMO 삼수，즉불균균성삼수 s 화각향이성삼수η，사주시방정만족장전람채집수거처리요구。모형시산급실제수거처리결과현시，대편이거급두경각처적도집득도랍평，첩가후적부면성상경청석、신조비경고。
The conventional hyperbolic travel time is based on the hypothesis that offset is not larger than the depth of the reflector and is not suitable for velocity analysis and normal move-out of seismic data for the long cable acquisition mode with a large degree of migration and multi-folds. Based on these facts, we propose a long-array non-hyperbolic normal move-out (NMO) method and used it for the first time to process seismic data from the South China Sea. We introduced two parameters into this method, which are non-uniformity s and anisotropy η, in order to meet the requirements of seismic data processing with long cable acquisition. The results of both synthetic and field data for the non-hyperbolic NMO show that the seismic traces of a large offset and a steep dip angle are approximately aligned and the profiles have clear images and a high signal-to-noise ratio.