基于射线追踪正演照明的观测系统分析研究
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摘要
常规地震勘探采集中,观测系统设计是基于共中心点(CMP)理论进行的,传统的地震采集设计方法已不能完全满足日趋复杂的勘探状况。从近年来广泛讨论的地震照明技术出发,提出了针对目的层、基于射线追踪正演的观测系统属性分析方法,并给出了楔状模型和曲界面模型数值模拟实例,得到了基于目的层CRP点的面元信息——面元随偏移距变化的覆盖次数和能量(振幅)分布。通过定量分析得出结论,在上覆界面非水平情况下,其下伏地层覆盖次数及下传能量受很大影响。
The conventional method of seismic data acquisition geometry design is based on the assumption of horizontal subsurface reflectors,which often is not suitable for complex structures. This article presents the method of analyzing geometry property aimed at target based on ray tracing forward modeling. By computing 2 velocity models,we get the result of CRP bin information which contain fold and energy distribution while the offset changes. We concluded that the fold and downward energy under non-horizontal surface is badly affected by overlying strata.
The conventional method of seismic data acquisition geometry design is based on the assumption of horizontal subsurface reflectors,which often is not suitable for complex structures. This article presents the method of analyzing geometry property aimed at target based on ray tracing forward modeling. By computing 2 velocity models,we get the result of CRP bin information which contain fold and energy distribution while the offset changes. We concluded that the fold and downward energy under non-horizontal surface is badly affected by overlying strata.
引文
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8陈生昌,马在田,Wu Rushan.波动方程偏移成像阴影的照明补偿[J].地球物理学报,2007,50(3):844~850
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10Cerveny V.Seismic Ray Theory[M].Cambridge:Cam-bridge Univ,1997.102~188,234~288
2Berkhout AJ.Areal shot record technology[J].J Seis Expl,1992,1(2):251~264
3Rietveld WE A,Berkhout A J.Prestack depth migra-tion by means of controlledillumination[J].Geophys-ics,1994,59(5):801~809
4Schneider W A,Winbow G A.Efficient and accurate modeling of3-D seismic illumination[J].Expanded Abstracts of69thAnnual International SEG Meeting,1999,633~636
5Bear G,Lu Chinping,Lu R,et al.The construction of subsurface illumination and amplitude maps via ray tracing[J].The Leading Edge,2000,19(7):726~728
6Berkhout AJ,Ongkiehong L,Volker A W F,et al.Comprehensive assessment of seismic acquisition ge-ometries by focal beams,Part I:Theoretical considera-tions[J].Geophysics,2001,66(3):911~917
7Liu Shouwei,Geng Jianhua,Feng Wei.Controlled illu-mination and seismic acquisition geometry for target-o-riented i mageing[J].Applied Geophysics,2005,2(4):230~234
8陈生昌,马在田,Wu Rushan.波动方程偏移成像阴影的照明补偿[J].地球物理学报,2007,50(3):844~850
9Cerveny V著.地震地磁观测与研究丛书(四)—地震学中的射线方法[M].刘福田译.北京:地质出版社,1986.2~28
10Cerveny V.Seismic Ray Theory[M].Cambridge:Cam-bridge Univ,1997.102~188,234~288
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