基于等效偏移距的偏移成像方法.pdf

37 ( ) Vol. 37S p. 2007 11 Jo rnal of Jilin University(Earth Science Edition) Nov . 2007 基于等效偏移距的偏移成像方法 许　卓, 韩立国, 廉玉广 , 130026 : 等效偏移距偏移(EOM ) 成像方法将克希霍夫时间偏移的双平方根方程转化为一个单平方根方 程,使输入采 在没有发生时移的情况下映射到以等效偏移距为变量的共散射点道集上,使散射能量按照 双曲线规律分布。然后通过克希霍夫动校正和适用在共散射点道集上的叠加来完成偏移成像。基于等效偏 移距叠前地震偏移(EOM) 的基本理论, 对CSP 道集的抽取过程进行模拟实现, 并对模型进行速度分析, 实 现偏移成像。 : 共散射点道集; 等效偏移距; Kirchhoff 积分; 速度分析;偏移成像 : P631.4　　　　:A The Migration Imaging Method Based on Equivalent Offset XU Zh o, HAN Li-g o, LIAN Y -g ang Col le ge of GeoExp l orat ion S cience and T echnology , J il in Univ ers ity , Changchun 130026, China Abstract: Eq ivalent offset migration imageing method make the do ble sq are root eq ation ( DSR) of the Kirchhoff time migration into a single sq are root eq ation, prestack data w ill map to common , . scatter point gathers and moves scattered energy to hyperbolic paths on common scatter gathers Then completed by NM O correction and stacking applied on CSP gathers. This paper introd ced basic principle of eq ivalent offset seismic migration method. Sim late the formation common scatter point gathers, perform the stack migration. : ; ; ; Key words common scatter gathers eq ivalent offset Kirchhoff integral migration image ( 3) CSP , , , , , , (4) , , , , ( EOM) 1 Bancroft Geiger ( 1994) , : , CSP ( EOM) Kirchhoff , , ( ) , : ( 1) CSP , , ( 2) 1, t ts