基于地震反演约束的储层建模方法及应用

摘要

为了提高储层预测及表征精度,对基于地震反演约束的储层三维建模技术方法进行了研究及应用.首先利用地质统计学反演方法生成纵波阻抗三维数据体,与常规确定性反演结果相比,地质统计学反演方法建立的波阻抗数据体具有较高的纵向分辨能力和横向预测趋势,可反映井间薄储层的厚度及物性变化.其次,建立了纵波阻抗与岩性及孔隙度、渗透率、饱和度的岩石物理模版,其低阻抗值代表储层发育好的层段和位置.最后,以纵波阻抗数据体作为趋势约束,采用随机模拟算法,建立了研究区的岩性模型及储层属性模型.通过实钻井检验,模型结果与井点资料符合较好,显示了模型的精度和本文方法的可靠性,可以满足精细油藏描述和剩余油挖潜需求.%3D modeling technology based on seismic inversion constraint is studied in order to improve reservoir prediction and characterization accuracy.The comparison of 3D wave impedance obtained by geostatistics inversion method with the conventional deterministic inversion results reveals that the wave impedance data by geostatistical inversion method is of higher vertical resolution and lateral prediction,and it can reflect the thickness of thin reservoir and the change of physical property.Accordingly,the physical models of P-wave impedance,lithology,porosity,permeability and saturation are established.The low impedance values represent the well developed layers and positions.Then,the lithological model and reservoir attribute model of the study area are established by using the stochastic simulation algorithm and by taking the P-wave impedance data body as the trend constraint.The practical drilling test proves that the results are in good agreement with the well point data,with good accuracy and reliability.This method can meet the needs of fine reservoir description and potential tapping of remaining oil.