速度建模的影响因素与技术对策  

Influencing factors and technical strategies for velocity modeling

作　　者：胡英[1] 张研[1] 陈立康[1] 崔兴福[1] 

机构地区：[1]中国石油勘探开发研究院物探技术研究所,北京100083

出　　处：《石油物探》2006年第5期503-507,共5页Geophysical Prospecting For Petroleum

摘　　要：叠前深度偏移速度建模是一种基于模型的迭代修正过程。影响速度模型精度的因素,除了速度反演算法之外,还包括复杂近地表条件下的静校正处理和观测系统的不规则性。从地震资料处理解释一体化的研究思路出发,针对不同的地震地质条件,提出了建立精确速度模型的对策。在地震勘探程度较高的地区,首先采用测井约束法建立初始宏观层速度模型,然后利用多域双重迭代法进行优化更新,以达到满足叠前成像精度要求的目的。另外,针对我国西部山地冲断带地区速度建模存在的问题,提出了速度建模的思路和对策,并对该项技术的发展趋势进行了展望。Velocity model building for prestack depth migration is a model-based iteration process. Besides velocity inversion algorithm, the static correction in complex near-surface condition and irregular geometries may also impact the velocity modeling. Based on integrating seismic processing and interpretation, aimed at different seismic-geological conditions, the strategy of accurate velocity model establishment is proposed. In some high degree exploration areas, the initial macro interval velocity model is firstly established by u-sing the logging-constrained method, and then, the double-iteration method in multi-domains is applied on velocity model updating to meet the accuracy of prestack imaging. In addition, based on some problems in velocity modeling in the foreland basin of west China, the thought and strategy for velocity modeling are proposed and the development tendency of this technique is analyzed.

关 键 词：叠前深度偏移 速度建模 双重迭代法 剩余速度分析 层析反演 

分 类 号：P631.4[天文地球—地质矿产勘探]