论文部分内容阅读
为考察复杂陆相沉积地层河道砂体在地震剖面上的反射特征,首先建立了河道砂沉积地质模型,然后利用声波波动方程正演得到叠前地震记录,并对模拟的共炮点道集进行叠前时间偏移,最后,对成像数据上的反射特征和瞬时属性特征进行了分析,并对测井约束波阻抗反演方法进行了实验。实验结果表明:由于波场干涉的影响,地震反射同相轴与河道砂体之间不具有明确的对应关系,地震反射同相轴的产状不能代表地下砂体的真实产状,波场干涉形成的同相轴很可能导致砂体解释的误差和陷阱。在利用地震波瞬时属性对沉积砂体进行分析时,未能较好地建立瞬时属性与沉积砂体之间比较明确的对应关系。测井约束反演较好地改善了河道砂体的分辨能力,但是,当对反演结果的分辨率要求过高时,很可能导致与初始模型有关的反演假象。
In order to investigate the seismic reflection characteristics of the channel sand bodies in complex continental sedimentary strata, the sedimentary geological model of the channel sand was first established and then the prestack seismic records were obtained by forward modeling of the acoustic wave equation. The prestack time migration, and finally, the reflection characteristics and instantaneous property characteristics of the imaging data were analyzed, and the logging impedance impedance inversion method was also tested. The experimental results show that due to the influence of the wave field interference, there is no clear correspondence between seismic reflection events and channel sand bodies. The occurrence of seismic reflection events can not represent the true shape of underground sand bodies, Isotopes are likely to cause errors and traps in sand body interpretation. In the analysis of sedimentary sand bodies using the instantaneous attributes of seismic waves, a relatively clear correspondence between instantaneous attributes and sedimentary sand bodies has not been established. Well logging constrained inversion can well improve the resolution of channel sand bodies. However, when the resolution of the inversion results is too high, it is likely to lead to the inversion artifacts associated with the initial model.