| 小尺度网格层析速度建模方法在低幅构造区时深转换中的应用 |
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| 引用本文： | 吕振宇,魏鹏.小尺度网格层析速度建模方法在低幅构造区时深转换中的应用[J].地球物理学进展,2020(1):339-344. |
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| 作者姓名： | 吕振宇 魏鹏 |
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| 作者单位： | 中海石油（中国）有限公司天津分公司渤海石油研究院;中海油田服务股份有限公司油田生产研究院 |
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| 摘 要： | 渤海M油田区浅层多发育低幅构造,低幅构造区的地震数据对常规层析成像不够敏感,导致常规速度反演方法很难保证低幅构造速度建模的准确性,从而给时深转换工作带来较大误差.本文提出一种小尺度网格层析速度建模方法,该方法基于低幅构造的薄层信息,在有薄层信息的地层加密网格分布,从而实现根据地质条件划分网格的策略,进而通过解析矩阵方程实现速度模型的迭代更新.通过实际数据应用证明,对于渤海M油田利用本文提出的高精度网格层析速度建模方法是有效可行的,该方法能够有效提高低幅构造区速度建模的精度,利用该方法得到的速度模型能够大幅提高时深转换的精度,从而指导构造解释及成图工作.
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| 关 键 词： | 低幅构造 速度建模 网格层析 成图工作 |
Application of small scale grid tomography velocity modeling method in time-depth conversion of low-amplitude structural region |
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| Lü Zhen-yu,WEI Peng.Application of small scale grid tomography velocity modeling method in time-depth conversion of low-amplitude structural region[J].Progress in Geophysics,2020(1):339-344. |
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| Authors: | Lü Zhen-yu WEI Peng |
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| Institution: | (Bohai Petroleum Research Institute,Tianjin Branch of CNOOC,Tianjin 300452,China;Oilfield Production Research Institute,Zhonghai Oilfield Service Company Limited,Tianjin 300452,China) |
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| Abstract: | The Bohai M oilfield area is complicated in structure,shallow layer develops low amplitude structure,middle and deep layer is accompanied by large set of low velocity mudstone,conventional velocity inversion method is difficult to ensure the accuracy of velocity modeling in this area,which brings great error to time-depth conversion work.In this paper,a method of modeling the velocity of small scale grid tomography is proposed.The method is based on the collected thin layer information,and encrypts the grid distribution in the stratum with thin layer information,so as to realize the strategy of meshing according to the geological conditions.Furthermore,the iterative updating of the velocity model is realized through the analytic matrix equation.Through the application of the actual data,it is proved that the high precision grid tomography velocity modeling method proposed in this paper is effective and feasible for Bohai oil field,and this method can effectively improve the accuracy of velocity modeling in lowamplitude structural area.The velocity model obtained by this method can greatly improve the accuracy of time-depth conversion,thus guiding the structural interpretation and mapping work. |
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| Keywords: | Low amplitude structure Velocity modeling Grid tomography Mapping work |
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