基于倾角中值滤波浅层反射地震叠前信噪分离技术.pdfVIP

基于倾角中值滤波的浅层反射地震叠前信噪分离技术 聂爱兰 智 敏 张宪旭 孙永亮 中煤科工集团西安研究院，陕西西安710077 摘要：浅层反射地震资料中一般面波比较发育，而现有压制面波的处理手段并不适用于浅层 反射地震资料。倾角中值滤波法是基于叠前地震单炮道集上反射波与强线性干扰在视速度上 的差异，在多组视倾角范围内求取一个最佳视倾角，将最佳视倾角上振幅序列的中值视为线 性干扰，利用 “减去法”从单炮记录中剔除，从而达到信噪分离的目的。理论模型与实际资 料的应用效果表明：该方法能够有效分离强线性干扰，提高了资料的信噪比，保真度高，是 浅层高分辨率地震资料处理中一种理想的叠前信噪分离技术。 关键词：浅层反射地震；中值滤波；线性干扰；面波；信噪分离 P631 A Thepre-stacknoiseseparationtechnologyofshallowreflectionseismic basedondipmedianfilteringmethod NIEAilanZHIMinZHANGXianxuSUNYongliang XianResearchInstitute,ChinaCoalTechnologyEngineeringGroupCorp,Xian710077,China Abstract:Thesurfacewaveisgenerallydevelopingwellintheshallowreflectionseismicdata,whilethemeansfor suppressingthesurfacewavedonotapplytoshallowreflectionseismicdataprocessing.Thedipmedianfiltering methodisbasedonthedifferentapparentvelocitybetweenseismicreflectwavesandstronglinearinterferencein pre-stackshotgathers,Itisachievedasfollowing:firsttodefineapparentdipsinacertainrange,andtogetacor respondingsequenceofamplitudeforeachapparentdip;secondtoobtainthemaximumfromapparentdips;third totakethemid-valueofamplitudesequenceaslinearinterference,lasttobesubtractedthemid-valuefromthe pre-stackgatherssoastoreachthenoiseseparation.Theoreticalmodelandapplicationtofiledseismicdatashow that:themethodcaneffectivelyseparatestronglinearinterference,withimprovingthesignal-to-noiseratio,also bringhighfidelity,themethodisanidealtechnologyofpre-stacknoiseseparationinshallowhigh-resolutionseis micdataprocessing. Keywords:theshallowreflectionseismic;medianfiltering;linearinterference;thesurfacewave;signal-noiseseparation )：对这∥’ -离，同倒 g；跨度； 皂层折射多 的单炮记蜀 l的道路 【M】 k出一维紫