扩展弹性阻抗反演在深海扇含气储层识别中的应用

深海扇A区块的纵波阻抗对气水层的分辨能力低，利用常规叠后波阻抗难以有效预测流体展布范围，为此采用了叠前扩展弹性阻抗反演技术。扩展弹性阻抗反演技术是弹性波阻抗反演的进一步推广，其包含更丰富的岩性和流体信息，是一种有效的流体检测技术。在简介扩展弹性阻抗的概念以及反演方法原理的基础上，着重分析了研究区流体检测敏感参数，优选了流体检测的最优理论角度，最终计算生成了用于流体检测的扩展弹性阻抗曲线。对研究区实际资料进行的扩展弹性阻抗反演的实际应用效果表明，扩展弹性阻抗反演在深海扇储层的流体识别，特别是气水判别方面具有良好的效果，由此为深海扇储层的含流体性质建立了一种有效的判别方法。

Application of EEI Inversion Technique to Submarine Gas Reservoir

In submarine Block A,traditional post-stack wave impedance cannot effectively predict the fluid-distribution range because of low ability of P-impedance to identify gas and water. In this paper,we adopt the pre-stack extended elastic impedance (EEI) inversion technique. EEI inversion technique including more information about lithology and fluids is an effective technique for the fluid detection and recognition. On the basis of briefly presenting the concept,method and principle of EEI,we use this inversion method to the submarine Block A. We check the sensitive parameters for fluid detection,optimize the optimal theory angles for fluid detection,and calculate the EEI curves for fluid detection. The results show that the pre-stack extended elastic impedance inversion is favorable for the submarine reservoir fluid identification,especially for the gas and water detection. So the effective fluid identification is established for deep submarine fans.