Application of prestack simultaneous inversion in sandstone oil reservoir prediction
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摘要: AVO技术已成为非常重要的烃类检测的工具,而以AVO理论为基础的叠前同时反演则日益成为常用的研究方法.本文首先从已钻井岩石物理分析入手,综合已钻井的AVO正演模拟和流体替代,分析了利用AVO技术对研究区目标层进行岩性和油水识别的可行性.利用叠前同时反演得到了纵波阻抗、横波阻抗和密度数据体,在此基础上计算得到纵横波速度比和泊松阻抗数据体,对研究区目标层进行了岩性和油气预测,取得了良好的应用效果.Abstract: AVO technology is an very important tool of hydrocarbon detection. Prestack simultaneous inversion based on AVO theory has become a very popular research method. Based on the analysis of the rock physical properties of the drilled well and integrated the analysis of the AVO forward modeling and fluid substitution, the paper analyses the feasibility of lithology identification and oil-water recognition in the target layer of researched area by using AVO technology. Using the prestack simultaneous inversion, acoustic impedance, shear impedance and density volumes can obtain at the same time. On that basis, the velocity ratio of compression to shear wave and poison impedance are computed, and by using this data the lithology and oil & gas predictions of the target layer of study area are studied and achieved good application effect finally.
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