CAJ | 학술논문

目前,叠前时间偏移处理技术广泛应用于油气田的地震勘探资料处理中,影响叠前时间偏移成像的最主要因素就是数据品质.四川盆地东部地区由于地表条件复杂,资料噪声较重,野外采集通常采用变化的观测系统施工,部分地段炮检距分布非常不均匀,造成资料品质不能满足叠前时间偏移的需要.通过对川东地区一条二维测线叠前时阃偏移成像效果的试处理分析,总结出一套提高叠前时间偏移成像质量的技术方法,即利用偏移前道集去噪技术,提高道集资料信噪比;运用道内插技术,改变由于野外施工造成数据分布不均的现象.最终使得数据品质能够满足叠前偏移处理的条件.
목전,첩전시간편이처리기술엄범응용우유기전적지진감탐자료처리중,영향첩전시간편이성상적최주요인소취시수거품질.사천분지동부지구유우지표조건복잡,자료조성교중,야외채집통상채용변화적관측계통시공,부분지단포검거분포비상불균균,조성자료품질불능만족첩전시간편이적수요.통과대천동지구일조이유측선첩전시곤편이성상효과적시처리분석,총결출일투제고첩전시간편이성상질량적기술방법,즉이용편이전도집거조기술,제고도집자료신조비;운용도내삽기술,개변유우야외시공조성수거분포불균적현상.최종사득수거품질능구만족첩전편이처리적조건.
The technique of pre-stack time migration has been widely applied in seismic processing in oil and gas fields. Data quality is the major factor influencing pre-stack time migration. Surface conditions are complex in eastern Sichuan Basin and the noise level of the seismic data is high, so variable observation system is usually applied in field acquisition. The uneven distribu-tion of offsets in some areas may result in data quality being too low to meet the requirements of pre-stack time migration. Based on an analysis of trial pre-staeking time migration processing of a 2D seismic line in eastern Sichuan Basin, a set of meth-ods is are developed to improve pre-stack time migration, including the noise-remove technique for enhancing signal-to-npise ra-tio of the gather and the trace interpolation technique for eliminating uneven distribution of data. These techniques can make the seismic data qualified for pre-stack time migration.