时差自动拾取共聚焦点成像技术及应用研究  

RESEARCH ON MOVEOUT AUTOMATIC PICKING COMMON FOCUS POINT IMAGING TECHNI QUE AND ITS APPLICATION

作　　者：刘江平[1] 姚姚[1] 罗银河[1] 

机构地区：[1]中国地质大学.武汉

出　　处：《天然气工业》2005年第5期31-33,共3页Natural Gas Industry

基　　金：国家自然科学基金项目(40174034)资助。~~

摘　　要：文章针对共聚焦点(CFP)成像技术的研究现状,给出了常规CFP成像技术所存在的不足,提出了时差自动拾取CFP成像技术的基本思路和步骤,进行了多层水平与起伏(包括有、无高斯噪声两种情况)层状介质理论地质模型的常速度初始模型时差自动拾取CFP成像的数值模拟计算。应用该技术对某油气田三维测区中的实测测线资料进行了常速度初始模型时差自动拾取CFP成像计算,并与叠前偏移结果和声测井曲线进行了比较分析。研究结果表明:①时差自动拾取CFP成像技术是具有理论依据的和可行的:②该技术有效地避免了由于人工拾取时差的不正确所引起的串层现象和提高了时差拾取精度;③该技术既可实现波场归位又可提高记录的信噪比,具有较强的抗噪能力;④该技术有效地提高了CFP成像技术的精度和效率,使CFP成像技术更具有实用性。In consideration.of the current situation of the research on conventional common focus point (CFP) imaging technique) the shortcomings existing in the technique are pointed out in the paper. On the basis of presenting the basic idea and steps of the moveout automatic picking CFP imaging technique) its numerical simulation calculation was carried out by use of the constant velocity initial model of the theoretical geological models of multilayer horizontal and fluctuant beded mediums with or without Gauss noise. Ac-, cording to the 3-D seismic data of one field) the relevant calculation was finished by applying this technique. Through studying and comparing the calculation result with the prestack migration result and acoustic logging data, it was indicated that 1 the moveout automatic picking CFP imaging technique is feasible, being of theoretic basis; 2 the technique can effectively avoid the event-mispicking caused by the inaccuracy of artificial moveout picking, thus raising the picking precision; 3 the technique may not only realize wave field homing but also improve signal-to-noise ratio having great antinoise ability; and 4 the technique can effectively raise the precision and efficiency of CFP imaging technique, thus causing the technique to be particularly possessed of practicability.

关 键 词：成像技术 自动拾取 聚焦点 时差 应用 数值模拟计算 理论地质模型 初始模型 CFP 研究现状 基本思路 层状介质 高斯噪声 比较分析 测井曲线 叠前偏移 研究结果 抗噪能力 常速度 油气田 信噪比 实用性 精度 测区 波场 

分 类 号：P631.84[天文地球—地质矿产勘探]