【摘要】 辽河拗陷低潜山地震资料具有信噪比低、断点绕射复杂、潜山形态及其内幕反射不清楚的特征,为此,必需提高资料信噪比和成像精度。本文采用分方位角速度分析及叠加、地表一致性、三维投影滤波去噪、各向异性倾角时差校正、偏移速度场扫描及层速度场平滑、叠前时间偏移等数据处理技术,并详细介绍了各项技术的方法原理及应用效果。研究后认为,前三项技术可以在保持有效地震信号特征的前提下,有效地压制干扰,提高剩余静校正的精度,从而提高低潜山资料的信噪比;后三项技术有力地保证了低潜山带复杂构造成像的精度。初步形成了一套针对辽河低潜山地区地震资料特点的资料处理技术系列,对低潜山地区的地震资料处理具有参考与实用价值。更多还原

【Abstract】 The seismic data with low-amplitude buned-hill in Liaohe depression are characterized by low S/N ratio ,complex diffractions of faults , unidentified feature of buried-hill configuration and interior reflections. For that reason.it has to improve the S/N ratio of seismic data and imaging precision. We used such data processing techniques as sub-azimuth velocity analysis and stack, surface consistence, 3-D map filtering noise-elimination, anisotropic DMO. sweeping of migrated velocity fields and interval velocity smoothing and prestack time migration and detailed introduced the principles and application effects of each technique. We considered after study that the former three tech niques could effectively suppress the interference, improve the precision of residual statics and improve the S/N ratio of data in low-amplitude buned-hill in a precondition of preserving the fea ture of useful seismic signals;the later three techniques can strongly guarantee the precision of images in complex structures of low-amplitude buried-hill. A set of data processing techniques series aimed at the feature of seismic data in Liaohe low-amplitude buried hill areas are preliminarily formed,which gives a reference and practical value to seismic data processing in low-amplitude buried-hill areas.更多还原