敏感流体因子定量分析与直接提取

Sensitive fluid factor extraction and analysis

基于叠前反演的流体因子提取是当今油藏地球物理的研究热点,目前的流体因子提取存在两个问题:1流体因子的种类繁多,增加了问题的复杂性和盲目性;2流体因子往往是通过叠前反演的结果间接计算获得,具有较大的累计误差。针对这两个问题,建立了一种敏感流体因子定量分析与直接提取方法,提出了流体因子敏感系数的概念,用于定量分析流体因子区分不同流体的能力,并得到研究工区最敏感的流体因子;在得到敏感流体因子之后,将该流体因子近似方程和叠前反演相结合,建立流体因子直接提取的目标函数,通过求解该目标函数,直接得到了敏感流体因子。实际应用结果表明,该方法的流体因子敏感性定量分析过程合理,流体因子直接提取结果客观准确,益于进一步推广应用。

Prestack inversion based fluid factor extraction is now one of the hottest spots of reservoir geophysics research.However,there are two problems with fluid factor extraction:A.The variety of fluid factor increases the complexity and blindness of the fluid factor extraction;B.Fluid factor is often obtained by indirect way which can create more uncertainty,and accumulative errors caused by the indirect calculation.An approach to sensitive fluid factor quantitative analysis and direct extraction is set up in this paper according to these two problems.Firstly,the concept of fluid factor sensitive coefficient(FFSC)is proposed in order toquantitatively calculate fluid factor ability to distinguish different fluids.Secondly,the objective function is built combining fluid factor approximate equation and prestack inversion after acquiring sensitive fluid factors.Finally,sensitive fluid factors are acquired directly by solving this objective function.Application results show that fluid factor quantitative analysis process is reasonable and the extraction results are objective and accurate.So the proposed approach is beneficial for further popularization and application.