| 速度差对井间走时层析成像质量的影响及其改进方法 |
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| 引用本文： | 陈国金,曹辉,吴永栓,邹飞,姚振兴.速度差对井间走时层析成像质量的影响及其改进方法[J].地球物理学报,2006,49(3):915-922. |
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| 作者姓名： | 陈国金 曹辉 吴永栓 邹飞 姚振兴 |
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| 作者单位： | 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，南京210014 2 中国科学院地质与地球物理研究所，北京 100029 3 南京航空航天大学，南京 210016 |
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| 基金项目： | 中国石化油藏综合地球物理研究中心重点研究项目（P02046）资助.致谢 感谢南京石油物探研究所应用地球物理实验室的赵群及其同事提供物理模型的资料. |
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| 摘 要： | 在井间地震初至走时层析成像中，随着相邻地质体速度差的增大，使得射线分布不均匀，以及网格剖分不合适，导致层析成像结果不理想.物理和数值模型的井间走时层析成像表明：当速度差超过300%时，层析结果畸变较大；在300%～150%之间时，层析结果较好；低于150%时，层析结果好.在此基础上，提出了井间多尺度初至走时层析成像方法，即对同一模型采用多种网格剖分来同时进行层析成像，以获得研究区域的速度图像.数学和物理模型的井间多尺度走时层析结果表明：该方法很好地兼顾了层析成像的分辨率和精度，极大地改善了井间地震层析成像的质量.即使速度差超过30%，其多尺度的层析结果仍然较好.因此，这种方法具有实际应用的潜力.
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| 关 键 词： | 井间初至走时层析成像 速度差 射线分布 网格剖分 多尺度 分辨率 精度 |
| 文章编号： | 0001-5733（2006）03-0915-08 |
| 收稿时间： | 2005-05-12 |
| 修稿时间： | 2005-05-122006-02-15 |
Effects of velocity contrast on the quality of crosswell traveltime tomography and an improved method |
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| CHEN Guo-Jin,CAO Hui,WU Yong-Shuan,ZOU Fei,YAO Zhen-Xing.Effects of velocity contrast on the quality of crosswell traveltime tomography and an improved method[J].Chinese Journal of Geophysics,2006,49(3):915-922. |
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| Authors: | CHEN Guo-Jin CAO Hui WU Yong-Shuan ZOU Fei YAO Zhen-Xing |
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| Institution: | 1.Institute of Geophysical Prospecting, SINOPEC, Nanjing 210014,China 2 Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029,China 3 Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China |
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| Abstract: | The quality of the tomographic result is not good as expected because of the uneven ray coverage caused by increasing velocity contrast of the neighboring geological bodies and the inappropriate grid discretization in crosswell seismic first-break traveltime tomography. The tomographic results of physical and numerical models prove that when the velocity contrast is greater than 30.0 %, its tomographic result will be deformed significantly, when between 30.0% and 15.0%, it will be acceptable, and when less than 15.0%, it will be very good. The multi-scale crosswell traveltime tomography is proposed on the above basis. The method is a simultaneous traveltime tomography using various grid discretizations for the same model to obtain velocity reconstructive images of a study area. The tomographic results of numerical and physical models show that this method simultaneously considers the resolution and accuracy of tomography and can significantly improve the quality of crosswell tomography. Even if the velocity contrast is more than 30.0%, multiscale tomographic results are still good. Therefore, this method can be applied to real crossweU seismic data tomography. |
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| Keywords: | CrossweU first-break travehime tomography Velocity contrast Ray coverage Grid discretization Multi-scale Resolution Accuracy |
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