适于复杂断块的地震资料叠前时间偏移处理技术——以泌阳凹陷为例  

Prestack Time Migration Applied to Seismic Data Processing in Complex Fault Blocks,Biyang Sag

作　　者：曾庆才[1] 杜耀斌[2] 王德发[1] 段洪有[2] 李琛[2] 

机构地区：[1]中国地质大学(北京),北京100083 [2]中国石化河南油田分公司勘探开发研究院,河南南阳473132

出　　处：《新疆石油地质》2007年第2期182-184,共3页Xinjiang Petroleum Geology

摘　　要：泌阳凹陷北部斜坡带构造复杂,小断块发育,地震纵、横向速度变化剧烈,成像困难,常规的地震成像方法成果难以满足勘探开发的需要。采用弯曲射线叠前时间偏移技术使小断块准确偏移归位,其走时方程更接近层状介质地震波的真实传播路径,成像聚焦更精确,且通过特殊振幅处理,其偏移结果有很好的保幅性,输出的道集可以用于岩性分析和反演研究。经实际应用,获得了较高质量的成像剖面,通过综合解释,对泌阳凹陷北部斜坡带断裂特征取得了新认识,发现了一批新圈闭,经钻探见到了良好的油气显示。The slope zone in northern Biyang sag is characterized by complex structure,developled minor fault blocks,varied seismic vertical and horizontal velocities and diffcult to get imaging,which result in that conventional imaging approaches are hard to meet the needs for exploration and development of this area.This paper presents the prestack time migration to curved rays for minor fault blocks,which is of more accurate migration,allowing the travel-time equaton to be more close to the real pathway of layered media seismic wave propagation,the forcused imageing to be more precise,the migrated results to be of good presseved amplitude processing property and the ourput tuace gathers to be used for the lithologic analysis and inversion study,Case study shows that by this approcach the imaging profiles with higher quality can be obtained,hence new recongnitions of faults are gained,new traps are discovered and good oil shows in slope belt of northrn Biyang sag have been encountered by dirlling.

关 键 词：复杂断块群 叠前时间偏移 地震成像 振幅 圈闭 

分 类 号：P631.4[天文地球—地质矿产勘探]