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地震偏移成像技术研究现状与发展趋势

Keywords: 偏移成像,叠前深度偏移,研究现状,发展趋势

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Abstract:

?地震偏移成像是在一定的数学物理模型(声介质、弹性介质等)基础上,应用相应的地球物理理论,将地面观测到的多次覆盖数据反传,消除地震波的传播效应并得到地下介质模型图像的过程。本文首先从不同的分类角度对地震偏移进行了简单评述,较为详细地阐述了如今广泛应用的几类叠前深度偏移方法,分析了计算效率和成像精度、保幅性、起伏地表以及介质复杂性对偏移成像适用性的制约,指出选取偏移成像方法时需要具体问题具体分析,要明确方法的假设条件和适用范围。最后通过总结近年来seg/eage会议及出版物中有关地震偏移成像的讨论专题,展望了地震偏移未来走向和发展趋势,可以概括为:①叠前深度偏移已经成为地震偏移的研究主流;②逆时偏移逐步由理论研究步入工业化应用;③地震偏移成功地从二维走向三维;④起伏地表偏移受到广泛关注;⑤ti、vti和tti介质偏移成为研究热点;⑥反演偏移已经作为偏移领域的新宠登上历史舞台。

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