波阻抗反演技术在孤东地区馆陶组薄储层描述中的应用

根据一维波动方程的拟合迭代法原理 ,给出了求解波阻抗σ(x)的算法。针对孤东地区馆陶组薄储层油藏存在的地层埋深浅、较疏松以及井径变化大泥岩中含有膨化矿物蒙脱石等引起的声波测井速度失真问题 ,采用分段函数法对其进行了校正。将校正后的声波资料进行反演 ,可得到高质量的资料 ,用该校正资料追踪描述的储层与录井结果吻合较好。应用结果表明 ,测井资料在反演中可以补充地震资料缺少的低频和高频分量 ,地震波阻抗反演技术是薄储层描述的有效方法

Application of wave impedance inversion technique to description of thin reservoir in Guantao Group

The principle of fitting iteration method for one-dimensional wave equation was discussed, and an algorithm for calculating wave impedance value was presented. The log data was used to compensate the low and high frequency components lacked in seismic data. The distortion of logging velocity in the thin reservoir of Guantao Group in Gudong area happened because of shallower buried depth of formation, relatively unconsolidated formation, larger variation in well diameter and mudstone mixed with montmorillonite (a kind of bulking mineral). A piecewise function method was adopted to correct the distortion of logging velocity, and the high-level sonic log data were obtained. The corrected logging data were applied to wave impedance inversion, the high-level data could be obtained, and the reservoir features traced and described by using corrected data were in good agreement with the logging results. The application example shows that the seismic wave impedance inversion is an efficacious method for describing the thin reservoir in this case.