| 倾斜界面绕射波时距曲线特征及其应用 |
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| 作者姓名： | 陈可洋 |
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| 作者单位： | 中国石油大庆油田有限责任公司勘探开发研究院, 大庆 163712 |
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| 摘 要： | 根据几何地震学原理推导了倾斜界面情况下的绕射波时距曲线方程,采用2种方法证明倾斜界面反射波与绕射波交点位置解的存在性及其唯一性.理论分析表明,倾斜界面绕射波时距曲线仍具有双曲线特征,且最小旅行时点的位置始终在绕射点正上方,与地层倾角等因素无关,是水平界面情况的一般形式.定性和定量研究了交点坐标趋向于无穷大时的临界参数计算公式,数值实例验证了这一结论.采用实际地震资料指出了常规地震容易导致的解释误区.
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| 关 键 词： | 倾斜界面 绕射波 时距曲线方程 地震波 交点位置 |
| 收稿时间： | 2010-03-19 |
| 修稿时间： | 2010-07-07 |
Diffraction wave time-distance curve character and its application |
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| Authors: | CHEN Ke-Yang |
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| Institution: | Exploration and Development Research Institute of Daqing Oilfield Company Limited of CNPC, Daqing 163712, China |
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| Abstract: | The diffraction wave time-distance curve equation with tilted interface was derived on the basis of geometric seismology theorem, and the existence and uniqueness of the crossover point between the reflection wave and diffraction wave was proved using two methods. Theoretical analyses show that the diffraction wave time-distance curve equation with tilted interface still has the character of hyperbolic curve and that irrespective of facets such as formational dip angle, the location of the minimum travel-time is still above the diffraction point, representing the general form of the horizontal interface condition. The critical parameter computational equation with the coordinates of the crossing point approaching the infinity was studied, and the numerical examples confirmed verified the conclusions. Errors in the conventional seismic interpretation based on practical seismic data were pointed out. |
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| Keywords: | tilted interface diffraction wave time-distance curve equation seismic wave crossover point position |
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