论文部分内容阅读
近年来,由于勘探区域构造的逐渐复杂化,要求我们对复杂界面反射的时距特征有更进一步认识.本文在已有对复杂界面研究的基础上,结合实际3D复杂地质构造特征,对复杂条件做了两个限定:一是反射界面有界,二是复杂界面有多个不同性质界面组合而成.在这两条限定条件下,从界面反射点出发,进行炮集P波反射时距特征研究.结果表明,复杂界面反射会生产多条时距曲线,反射时距特征随测线方位的变化而变化,不同方位的时距对应的三维反射路径、反射点范围、反射点位置以及界面特征不同.其次时距曲线之间存在着比较复杂的位置关系,包括交叉、断续和无信号道等特征,这些复杂特征与组合模型中倾斜界面的倾向、倾角、模型范围和深度有关.最后对复杂模型的理论数值分析得出了反射点范围与接收点范围的对应关系,并理论证明了复杂条件下部分反射特征以及反射盲区的存在,这与实际三维地震勘探相符合.此研究有助于实际生产的观测设计及数据处理解释,对于提高三维复杂构造反射界面的认识具有理论意义.
In recent years, due to the complexity of exploration area structure, we need to know more about the time-distance characteristics of complex interface reflection.Based on the existing research on complex interfaces and the actual 3D complex geological structure features, There are two limitations: one is the reflection interface is bounded, and the other is the complex interface has a combination of several different properties.In the two conditions, starting from the interface reflection point, The results show that the complex interface reflections produce a plurality of time-distance curves, the reflection time-distance characteristics vary with the survey line orientation, and the three-dimensional reflection paths, reflection point ranges, reflection point locations and interface features The second is that there are some complicated features in time-distance curves, such as the crossover, discontinuity and no signal channel, which are related to the inclination, inclination, model range and depth of the inclined interface in the combined model.Finally, The theoretical numerical analysis of the complex model gives the corresponding relationship between the reflection point range and the receiving point range, and the theory proves that the partial reflection characteristics under complex conditions And the existence of the reflective blind zone, which is in line with the actual 3D seismic exploration.This study is helpful to the actual production of the observational design and data processing and interpretation, which is of theoretical significance to improve the understanding of the three-dimensional complex structured reflection interface.