摘要
研究不同逆时成像条件是实现准确偏移成像的前提。分析了两种叠前逆时成像条件:基于初至走时的叠前逆时成像条件和相关型叠前逆时成像条件。从理论分析和数值试验角度,综合对比了两者在成像机理、计算效率、临时盘数据存储量、抗干扰能力、成像精度等方面的差异。分析结果表明,两种叠前逆时成像条件对应的偏移剖面上均存在较强能量的低频逆时噪声,且相关型叠前逆时成像剖面在信噪比和对复杂陡构造区域的成像效果等方面均优于基于初至走时的叠前逆时成像剖面,但存储量和计算量相对较大。
Study on different reverse-time imaging conditions is the precondition of the actualization of accurate migration imaging. This paper analyzed the basic principle of two kinds of pre-stack reverse-time imaging conditions： one is the pre-stack reverse-time imaging condition based on first-arrival travehime, and the other is the correlation type pre-stack reverse-time imaging condition. The differences of imaging mechanism, computational efficiency, the temporary disc＇s storage amount, anti-interference ability and imaging precision are comprehensively compared between them by theoretical analysis and numerical experiment. The results showed that both of the migration profiles of the above two pre-stack reverse-time imaging conditions had high-energy and low-frequency reverse-time noise, and the section＇s S/N and imaging effects on complex tilt construction area of the correlation type pre-stack reverse-time imaging profile was better than that of the pre-stack reverse-time imaging profile based on first-arrival travehime, but with the disadvantage of larger storage and computational amount.
出处
《油气藏评价与开发》
2011年第4期6-11,共6页
Petroleum Reservoir Evaluation and Development
关键词
叠前逆时偏移
初至走时
相关型
地震波动方程
逆时成像条件
pre-stack reverse-time migration, first-arrival traveltime, correlation type, seismic wave equation, reverse-time imaging conditions
