拉梅参数直接反演技术在碳酸盐岩缝洞型储层流体检测中的应用

Application of Lame parameter direct inversion in fluid identification for carbonate reservoir

(中国石油大学(华东)地球资源与信息学院,山东青岛266555)

Zong Zhaoyun,College of Geo-Resources and Information,China University of Petroleum (East China),Qingdao 266555,China

缝洞是某区碳酸盐岩储层的主要储集类型,非均质性强。为充分利用叠前地震资料的AVO信息,采用基于弹性阻抗反演的LMR技术来求取储层弹性参数信息，进而指导储层流体检测。首先，通过岩石物理和弹性参数流体敏感性分析得到流体敏感参数；其次，基于拉梅参数弹性阻抗方程开展拉梅参数的直接反演,以减少常规弹性阻抗先反演纵、横波速度和密度再计算拉梅参数信息所带来的累积误差；最后，利用反演得到的流体敏感弹性参数进行含气储层预测。实际钻井结果证明,在研究区采用基于叠前弹性阻抗反演的LMR技术能够有效地识别含水与含气储层。

Fracture-cave carbonate reservoir is the main reservoir in some area with strong heterogeneity.To make full use of AVO information in pre-stack seismic data,we applied the LMR technology based on elastic impedance inversion to obtain the information of elastic parameters for the reservoir to guide fluid indication.Firstly,we got the most sensitive elastic parameters based on the fluid sensitivity analysis of petrophysical and elastic parameters.Secondly,we utilized the LMR technology based on elastic impedance inversion to get the lame parameters directly which decreases the error brought by accumulative calculation by using common elastic impedance inversion method.Finally,the obtained fluid sensitive elastic parameters were used for gas-bearing reservoir prediction.Actual drilling information shows that LMR technology based on elastic impedance inversion can effectively identify water and gas layers.