深水扇储层物性多属性反演方法研究——基于'步聪法'进行敏感地震属性组合优选

摘要

深水扇储层砂泥岩纵波阻抗的动态值域范围常常相互重叠,采用常规纵波阻抗反演方法无法进行精确的储层物性描述.为解决此类问题,在探讨"步聪法"优选敏感地震属性组合的基础上,利用概率神经网络算法建立储层物性参数与敏感地震属性组合之间的非线性关系,实现了储层物性参数的直接反演.该方法在A油田应用取得了好的效果,成功解决了深水扇储层砂泥岩纵波阻抗动态值域范围相互重叠情况下的岩性识别及储层物性描述问题.%The dynamic ranges of P wave imped ance for shale and sandstone will frequently over lap in deep-water fan systems, and their reservoir petrophysics can not be accurately described with the conventional method of P-wave impedance in version.In order to solve this problem, through a discussion of optimizing a combination of sensitive seismic attributes by “the step-wise method”,some nonlinear relationships between the reservoir petrophysics and the optimal combination of sensitive seismic attributes were established with an al gorithm of probabilistic neural network, resulting in a direct inversion of reservoir pctrophysics parameters.An application of this method in oilfield A has led to good effects, in which the problems of lithologic identification and reservoir petrophysics description are successfully solved in the deep-water fan systems where the dynamic ranges of P-wave impedance for shale and sandstone may overlap.