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西湖凹陷目前勘探程度较低,特别是处于生烃中心的中央反转带钻井少且多数都未钻遇平湖组主力烃源岩。在充分吸收前人研究成果的基础上,利用测井资料纵向分辨率和地震资料横向分辨率高的优势,在测井约束下运用地震反演技术对西湖凹陷有效烃源岩进行评价与预测。通过对测井曲线进行校正与标准化,对自然伽马曲线进行拟声波阻抗曲线重构,并将波阻抗反演技术运用到烃源岩预测中,同时在计算的过程中进一步的优化计算的方法。经过多层次、多方位的方法对比和反演参数的试验,形成了针对西湖凹陷有效烃源岩厚度计算的技术方案,该技术在西湖凹陷中深层能较好地预测优质烃源岩发育厚度及展布特征,验证表明对烃源岩的平均识别率高达90%以上。
The current exploration of Xihu Sag is relatively low. In particular, the Central Reversal Belt Drilling at the center of hydrocarbon generation is few and most of them did not encounter the main source rocks of Pinghu Formation. On the basis of fully absorbing the research results of predecessors, using the advantage of the vertical resolution of logging data and high horizontal resolution of seismic data, seismic inversion technique is used to evaluate and predict the effective source rocks in the Xihu sag under logging constraints. By calibrating and normalizing the logging curve, the pseudo-acoustic impedance curve of natural gamma curve is reconstructed, and the wave impedance inversion technique is applied to the prediction of source rock. At the same time, the method of further optimization calculation . After multi-level and multi-directional comparison of methods and inversion of parameters, a technical scheme for calculating the effective source rock thickness in the Xihu sag has been formed. This technique can predict the thickness of source rocks of good quality and Distribution characteristics, verification shows that the average recognition rate of source rocks up to 90%.