CAJ | 학술논문

共聚焦点(CFP)偏移技术是一种基于等时原理,将Kirchhoff积分法的一步偏移分两步聚焦(即激发聚焦和检波聚焦)来完成的叠前地震成像方法.该方法借助于逆时聚集算子和共聚焦点道集来实现叠前偏移成像.基于共聚焦点道集的叠前深度偏移是把基于共炮集的深度偏移的算法引入到CFP技术上来,基于波场延拓的理论来实现偏移成像,该方法首先生成共聚焦点道集,然后基于面炮合成的理论合成聚焦震源,最终通过相关成像来实现叠前偏移成像.该方法选取较少的聚焦点就可以实现对于地下构造的偏移成像,和炮域波动方程偏移相比,其计算效率得到了提高.通过模型试算和实际资料的试处理,验证了该方法在实现叠前深度偏移成像上的正确性和有效性.
공취초점(CFP)편이기술시일충기우등시원리,장Kirchhoff적분법적일보편이분량보취초(즉격발취초화검파취초)래완성적첩전지진성상방법.해방법차조우역시취집산자화공취초점도집래실현첩전편이성상.기우공취초점도집적첩전심도편이시파기우공포집적심도편이적산법인입도CFP기술상래,기우파장연탁적이론래실현편이성상,해방법수선생성공취초점도집,연후기우면포합성적이론합성취초진원,최종통과상관성상래실현첩전편이성상.해방법선취교소적취초점취가이실현대우지하구조적편이성상,화포역파동방정편이상비,기계산효솔득도료제고.통과모형시산화실제자료적시처리,험증료해방법재실현첩전심도편이성상상적정학성화유효성.
The common-focus-point(CFP)migration technology is a kind of pre-stack seismic imaging methods based on the principle of equal traveltime,which separates Kirchhoff integral into two focusing steps(focusing on emission and focusing on detection).The method uses the time-reversed focusing operator and CFP gather to realize the pre-stack migration.We apply the recursive shot-record,depth migration algorithm to the CFP gathers of the seismic data and define this process as CFP-gather migration.We first get the CFP gathers and then use the theory of synthesis areal source to generate the focus source.Then based on the correlation migration we realize the pre-stack migration.Only choosing a few focusing points,we can get the migration result which is similar to the conventional common shot-records gather migration result,and improve the calculation efficiency.The experiment of the model and the process of the real data show the validity and the practicability of this method.