基于叠前反演的流体识别与频散AVO反演研究

Research the Fluid Identification and Frequency-dependent AVO Inversion Base on Pre-stack Inversion

由于纵波不能在流体中传播,叠后地震反演得到纵波波阻抗是无法识别储层中的流体。基于横波在流体中传播特点,利用叠前数据丰富的运动学与动力学信息获得弹性参数进行储层流体识别是可行的,但受到地震反问题固有的"病态解"等不确定性的影响,在进行叠前地震反演时会产生较为严重的多解性与不确定性,从而影响了后续的储层岩性与流体识别的精度。基于以上问题本论文以储层埋藏较深、钻井资料较少的D2地区为研究目标,采用测井岩石物理敏感分析、敏感流体因子反演和频散AVO反演三种技术综合来提高储层预测的精度,实际资料的应用效果表明采用多种技术方法来进行储层的流体识别是可行的。

As we know that P-wave cannot be propagated in the fluid material and the P-wave impedance cannot be identified by the post-stack seismic wave inversion.Based on the propagation characteristics of the S-wave in the fluid,the elastic parameters are obtained by using the kinematic and kinetic information Reservoir fluid identification is feasible,however it is affected by uncertainties such as"morbid solution"inherent in seismic inverse problem,and it will produce more serious solution and uncertainty when conducting pre-stack seismic inversion,subsequent reservoir litliology and fluid identification accuracy.Based on the above problems,this papertakes the D2area witli deep reservoir burial and less drilling data as the research target,and improves the reservoir by using the logging physics sensitive analysis,sensitive fluid factor inversion and dispersion AVO inversion.The accuracy of the prediction and the practical application of the data show that it is feasible to use a variety oftechnical methods to identify the reservoir fluid.