| 摘要: |
| 以水平层状为假设的常规速度分析和倾角时差校正都不能很好地解决倾斜地层反射点弥散问题,而高精度共散射点道集速度分析方法则可以很好地解决。研究优于常规方法的椭圆展开共反射点叠加速度分析方法,用它获得的速度场作为高精度共散射点道集速度分析方法的初始输入。同时,研究等价偏移距单平方根旅行时方程的推导,以及共散射点道集的提取过程及基于共散射点道集的速度分析方法与叠前时间偏移。通过两种方法的组合,从模型和实际资料的试算可以看出速度谱精度得到提高,获取得到高精度速度场,并且获取叠前时间偏移剖面的效率得到提高。 |
| 关键词: 地震勘探 共散射点 椭圆展开 速度分析 叠前时间偏移 |
| DOI：10.3969/j.issn.1673-5005.2014.02.006 |
| 分类号:P 315.8 〖HTH〗 |
| 基金项目:国家自然科学基金项目(41204086)；中国石油大学自主创新科研计划资助项目(13CX02041A)；教育部博士点基金项目(20110133120001)；国家“863”计划项目(2011AA060301);国家科技重大专项(2011ZX05006-002) |
|
| High-precision velocity analysis method in prestack time domain and its application |
|
XIE Yu-hong 1,CHEN Dian-yuan 1, LIU Ai-qun1, LI Zhen-chun2, ZHOU Qing2, WANG Li-jun 1
|
|
(1.Zhanjiang Company of China National Offshore Oil Corporation, Zhanjiang 524057, China;2.School of Geosciences in China University of Petroleum, Qingdao 266580, China)
|
| Abstract: |
| In a horizontally layered medium, the conventional velocity analysis and dip move-out correction methods cannot solve the problem of reflection point diffusion. The velocity analysis using high accuracy common scattering point gathers, however, can be a good solution. The ellipse evolving common reflection point velocity analysis method was used to get the velocity field as the initial input of the high accuracy of common scattering gathers velocity analysis method. The single-square root travel time equation of equivalent offset, extraction process of the common scattering point gathers velocity analysis method, and prestack time migration based on common scattering point gathers were also studied. Through a combination of two methods, velocity spectrums are greatly improved in the model and actual data. A high-precision velocity field is obtained, and the efficiency in the pre-stack time section is also improved. |
| Key words: seismic prospecting common scattering point ellipse evolving velocity analysis prestack time migration |
