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为了解决三维斜井井间地震数据成像问题,借鉴二维地面地震弯线及宽线处理思路,将三维井间地震成像问题转换成二维成像问题进行研究.利用三维逐段迭代方法对三维斜井井间地质模型进行正演模拟,计算上、下行反射波走时及反射点位置,通过对比正演记录与实际资料的特征,调整地质模型参数获取准确速度场.然后对波场分离后的共炮集数据进行反射波归位,得到共反射点道集数据.最后根据反射点的分布选择一条反射点分布最集中的剖面线,以一定的宽度将剖面线左右的反射点包裹起来;根据叠加宽度划分成大小相等的矩形面元,将面元内的共反射点数据投影到剖面线上进行二维叠加成像.通过模型测试,三维XSP-CDP叠加方法能有效反演地下结构特征,指导三维井间地震采集观测系统的设计并解决不共面斜井叠加成像问题.应用该方法对M地区实际资料进行成像研究,结果表明该方法可有效反演地下三维地质结构特征,为进一步数据处理提供依据.
In order to solve the problem of 3D seismic data imaging of inclined shafts, the 3D seismic cross-section seismic imaging problem is converted into two-dimensional imaging problem by referring to the two-dimensional ground curve bending line and wide line treatment method.Three- We can calculate the geostationary model parameters and get the accurate velocity field by comparing the characteristics of the forward record with the actual data, The data of the shot set is returned by the reflected wave to obtain the data of the common reflection point gather.Finally, according to the distribution of the reflection points, a section line with the most concentrated distribution of reflection points is selected, and the reflection points around the section line are wrapped with a certain width; And the width is divided into rectangular bosons of equal size, the total reflection point data in the briquette is projected on the cross-sectional line for two-dimensional superimposed imaging.Through the model test, the three-dimensional XSP-CDP stacking method can effectively invert the underground structural features and guide the three-dimensional Crosswell seismic acquisition observation system design and solve the non-coplanar inclined well superimposed imaging problem.Application of this method to the M region of the actual data imaging Study results show that the three-dimensional inverse method is effective underground geological structural characteristics, provide the basis for further data processing.