摘要
基于东部某油田物性资料,建立典型碎屑岩储层模型,利用弹性波方程交错网格有限差分正演,对模型进行多波正演模拟。通过分析正演模拟的炮集记录、叠前偏移剖面以及振幅属性,总结了多波正演的波场特点及其分辨率。分析结果表明,转换波反射频率比纵波的低,能量随偏移距的增加而增加,零偏移距处能量为零;转换波在地层厚度为λ/4处发生调谐效应,调谐振幅属性变化规律与纵波变化规律一致;综合考虑该区纵波、转换波波速以及不同深度的纵波、转换波中心频率变化,可知在该区目标层深度转换波分辨率低于纵波分辨率。
Multi-wave exploration is increasingly valued with seismic exploration changing trom structural exploration to lithological exploration. It is necessary to understand more about the wave field characteris- tics and resolution of the converted wave since it is different from the reflected wave. Based on the physical property data of one oilfield, a typical clastic reservoir model was established and staggered-grid finite difference method was used to do the multi-wave forward modeling. By analyzing the forward modeling shot gather, pre-stack migration profile and amplitude attribute, we summed up the wave field characteris- tics and resolution of multi-wave. Results indicate that the converted wave is of low velocity and frequen- cy, and its energy increases with offset, zero energy at zero-offset~ Tuning effect occurs when the layer thickness is one quarter of wavelength, and the turning amplitude properties variation of converted wave is consistent with that of longitudinal wave. Considering wave velocity and center frequency changes at dif- ferent depths, we can see that the converted wave resolution of target depth layer is lower than that of the longitudinal wave resolution.
出处
《地质科技情报》
CAS
CSCD
北大核心
2014年第2期186-191,共6页
Geological Science and Technology Information
基金
国家十二五油气重大专项专题"转换波数值仿真计算研究"(2011ZX05006-002)
关键词
碎屑岩
多波正演
转换波
分辨率
clastic rock multi-wave forward modeling converted wave resolution
