塔河油田南部缝洞储层的正演模拟及地震波场特征

Forward modelling and seismic wave field characteristics of fractured-vuggy reservoirs in the southern part of Tahe oilfield

塔河油田奥陶系碳酸盐岩非均质缝洞储层的地震响应特征复杂,而利用正演模拟技术模拟这种介质中传播的地震波的特征能为孔缝洞储层的预测提供理论依据。利用塔河油田南部的钻井资料,基于连续随机扰动模型,用阀值截取法模拟、构造各种不同的随机溶洞介质模型;利用联井地震剖面,建立接近实际的岩溶缝洞型储层地震-地质模型;利用非均匀介质的地震波场正演模拟技术,获得自激自收剖面及叠偏剖面。在此基础上,总结出了缝洞型储层的地震响应特征。

The characteristics of seismic response from the heterogeneous Ordovician fractured-vuggy carbonate reservoirs in Tahe oilfield are complicated. However, the forward modelling technique can be used to simulate the characteristics of seismic wave propagating through this kind of reservoirs and provide a theoretical principle for fractured-vuggy reservoir prediction. With drilling data from the southern part of Tahe oilfield, different random cavity-medium models were established through threshold truncation and continuous random perturbation modes. Seismic well-tie sections were also used in the construction of the seismic-geologic model that works better in simulating the real karst fractured-vuggy carbonate reservoirs. Pseudo zero offset section and stacked migration section were obtained through forward modelling of seismic wave field in heterogeneous medium. On these bases, the seismic response characteristics of fractured-vuggy carbonate reservoirs were summarized.