砂泥岩与灰岩交替出露区地震资料处理方法

A seismic data processing method for alternating sand-mudstone and limestone outcrop area

砂泥岩与灰岩交替出露区的特殊地震地质条件导致的一些问题是破解山地高陡构造区地震勘探的核心问题。针对地形起伏剧烈、表层岩性和结构变化大的特点提出了约束层析静校正方法;为提高灰岩出露区信噪比,提出了一套压制噪声的新思路;针对砂泥岩与灰岩交替出露区的强各向异性特点,采用各向异性速度分析和优选道叠加与剩余静校正结合,有利于改善叠加成像效果;叠前深度偏移的基础是高品质的叠前道集,关键仍然是高精度的速度模型。

As one of difficult seismic-geological conditions,the alternating sand-mudstone and limestone outcrop areas is a tight problem for mountain seismic exploration.We present in this paper a method of tomo static corrections for dramatic variations of topography,surface lithology and structure.To improve the signal to noise ratio of limestone outcrop areas,we propose some new idea for noise removal.For strongly anisotropy of alternating sandmudstone and limestone outcrop areas,we jointly use an anisotropic velocity analysis,optimized trace stacking,and residual static correction.Therefore imaging is much improved.Highly accurate velocity model based on quality trace gathers will provide a good foundation for prestack depth migration.