摘要
保持振幅一直受到广泛关注并取得很大进步,因此,能基本满足构造勘探的要求,但是对于岩性勘探却依然存在陷阱:共中心点CMP道集与一段地层的反射波相对应;叠前偏移存在混合作用及平均作用;共成像点CIP道集里包含相邻反射点振幅的影响;动校正和偏移过程中都存在拉伸作用等。CRP沿层叠加是针对目标地层反射波实施的专门处理,通过沿层追踪反射波(TRALayer——Tracing Reflection Along Layer)技术,按照入射角等于反射角的Snell定律,建立反射点与反射波的一一对应关系,从而得到沿层CRP道集与沿层CRP叠加。CRP道集用于叠前AVO反演,CRP叠加用于地层解释。与传统处理方式相比,TRALayer技术能有效地保持反射波的物理特征,细致反映反射波的空间变化和波形保真度;在振幅上避免横向混合作用,具有较高的相对振幅精度;在空间上遵从射线传播的几何关系,具有较高的空间定位精度。
Amplitude preservation has long been an important issue in seismic processing, great progress has been taken to satisfy the demand of seismic exploration especially for structural formation, but for lithologic prospecting, there still exist some pitfalls such as stretching effect in both NMO and migration, CDP scattering effect in CMP of dip reflection, dispersion as well as smearing effect in migration, and so on. To settle these effects on reflection, a technology called tracing reflection along layer （TRALayer） is designed to gather traces with same CRP （Common Reflection Point）, by which an one by one relationship between reflector point and reflection is established and Snell＇s law is stand. CRP gather is acquired by TRALayer, it could be used to accurate AVO inversion; CRP stack is acquired by TRALayer, and it could be used to precise interpretation. By TRALayer, physical characteristic of reflection might be reserved and its delicate spatial variation might be presented compared to traditional processing.
出处
《油气地球物理》
2012年第1期1-4,共4页
Petroleum Geophysics
关键词
CMP沿层叠加
斜层反射点分散
沿层追踪反射波
CRP沿层叠加
CMP superposition along layer, reflection smearing of CMP stack, tracing reflection along layer （TRALayer） and CRP stack along layer
