【摘要】 针对常规测井约束地震反演结果多解性强、分辨率低,很难从粗化的模型预测出精确的最优解,且对薄互层预测难度大等问题.本文提出了一种动态建模高精度外推反演的方法,它采用体空间动态建模的方法,不同于传统整体静态建模方法,即在井及外围体空间上优选多模型道逐道外推,反演结果可当作虚拟井实现空间外推.这样在地震波形和层序场约束下有利于地震波场空间重建,减弱地震反演对层位过高的要求,克服了常规整体静态建模受距离加权的影响,有利于解决复杂断层、复杂储层横向预测的问题,实现了测井地震高低频信息有效预测,提高了薄互层预测的分辨率和精度.通过理论模型试算和实际资料应用,预测垂向分辨率可达2～4 m.应用表明在先验知识约束下预测的精度和分辨率高于常规反演方法,在复杂储层预测中有较好的应用和推广价值.更多还原

【Abstract】 Aiming at the problems such as the conventional well log constrained seismic inversion have multiple solutions,low resolution,the optimal solution of up-scaling model is very difficult to predict,the prediction of thin interbeded layers has more difficulties and so on.The dynamic modeling high-accuracy extrapolation inversion method is proposed in this paper.The prediction idea has been changed from the traditional overall static modeling to spatial dynamic modeling.The high-accuracy extrapolation inversion method trace by trace is beneficial to reestablish seismic wave field spatial.More model traces(virtual wells) are recorded around and outside the wells.In this way the higher requirements of horizon are weakened on conventional seismic inversion by the characteristic of seismic waveform and sequence field,and the distance-weighted impact of overall modeling is overcome.It is benefit for complex faults and reservoirs to solve the lateral prediction problem.The effective prediction is achieved for low and high frequency information of logging and seismic data.The resolution and accuracy of seismic prediction have been improved for thin interbeded layers.Theoretic simulations and field data applications propose that the resolution is up to 2~4 m in the vertical.This method is to make full use of the priori knowledge.The accuracy and resolution are higher than the conventional inversion method for reservoir prediction,so the method has a good application and popularization.更多还原