单程波外推高陡倾角反射成像技术的应用研究  

Application of reflection imaging technology with one-way wave ex- trapolation in high and steep structure

作　　者：方伍宝[1] 张兵[1,2] 

机构地区：[1]中国石油化工股份有限公司石油勘探开发研究院南京石油物探研究所,江苏南京210014 [2]同济大学海洋与地球科学学院海洋地质国家重点实验室,上海200092

出　　处：《石油物探》2009年第5期488-492,共5页Geophysical Prospecting For Petroleum

摘　　要：基于单程波外推方法的二次反射波成像技术基本原理是:在将地震波场进行炮点下行波和检波点上行波常规波场延拓的基础上,进一步对检波点波场进行下行波延拓,对延拓的3个波场通过上、下行波两两交叉相关,进行上行和下行波场成像,该技术具有类似于逆时偏移的功能。以一个垂直构造模型为例,简要分析了高陡构造的波场特征;基于一个二维和一个三维高陡构造模型数据,进行了偏移成像处理试验,结果表明,可以对倾角大于90°的高陡构造精确成像。将该技术应用于某山前带实际地震资料的偏移处理,获得了较好的效果,常规偏移剖面中成像模糊的层位边界在该偏移剖面上成像清晰。The principles of secondary reflection wave imaging technology based on one-way wave extrapolation are as follows:based on the conventional down-going wave field continuation of shot points and the up-going wave field continuation of the receivers,the down-going wave field continuation of the receivers is carried out again. Through the cross-correlation between the three kinds of extrapolated wave fields,the imaging of up-going wave field and down-going wave field is completed.The technique is similar to the function of inverse-time migration.A model with vertical structure is taken to briefly analyze the features of the wave field in the high and steep structure.Numerical tests were performed on both synthetic data from 2-D and 3-D high and steep structure models.The results show that the steep reflection with the dip angle larger than 90°can be imaged accurately.The technique was applied to the actual seismic data from some piedmont zone,and good results were achieved. The fuzzy layer boundaries in conventional migration profile are clear on the new migration profile acquired by the technique.

关 键 词：单程波外推 二次反射波 深度偏移 高陡构造 

分 类 号：P631.4[天文地球—地质矿产勘探]