论文部分内容阅读
地震信号的低频成分包含了与储层流体流度有关的信息,本文在含流体孔隙弹性介质依赖频率的反射系数渐近分析理论基础上,推导了储层流体流度的计算实现式,构建了低频段优势频率的确定方法,利用地震信号低频段优势频率的瞬时谱,实现了储层流体流度的直接计算。文中应用该方法分别处理了渗透性储层模型的合成地震记录,以及陆上和海上地震资料,结果表明:流体流度信息对于油气储层显示了良好的成像能力,可用于确定油气储层的位置及其空间展布,降低流体识别的多解性和不确定性。
The low-frequency component of the seismic signal contains information related to reservoir fluid flow. Based on the theory of asymptotic analysis of the reflection coefficient of fluid-dependent pore elastic media, the calculation formula of reservoir fluid flow is deduced. The method to determine the predominant frequency of low frequency band utilizes the instantaneous frequency spectrum of dominant frequency of low frequency band of seismic signal to realize the direct calculation of reservoir fluid flow. The proposed method is applied to the synthetic seismograms of permeable reservoir models and the onshore and offshore seismic data respectively. The results show that the fluid flow information shows good imaging ability for oil and gas reservoirs and can be used for the determination of oil and gas reservoirs Location and its spatial distribution, reducing the fluid identification of multiple solutions and uncertainty.