基于叠前反演的泥页岩地层压力预测方法

为了解决泥页岩地层压力预测问题，以焦石坝地区志留系龙马溪组页岩气储层为研究对象，调研分析了现今常用地层压力预测方法的适用性。在对页岩气储层异常压力发育段进行测井响应特征分析的基础上，提出能够有效识别页岩气异常地层压力的新参数，即异常地层压力识别因子；最后利用叠前弹性波阻抗反演结果计算出异常地层压力识别因子，从而预测焦石坝地区泥页岩地层的压力分布特征。与传统预测方法相比，基于叠前弹性波阻抗反演的泥页岩地层压力预测新方法具有更高的精度。该研究成果可以应用于泥页岩地层的压力预测，为页岩气精细勘探提供了依据。

Prediction method of shale formation pressure based on pre-stack inversion

With the deep exploration and development of shale gas,formation pressure prediction has become an urgent problem to be solved. Taking shale gas reservoir of Silurian Longmaxi Formation in Jiaoshiba area as the research object,the applicability of traditional formation pressure prediction methods was analyzed. Based on the analysis of logging response characteristics of abnormal pressure development zone of shale gas reservoir,a new parameter,namely abnormal formation pressure factor,was proposed to effectively identify abnormal formation pressure of shale gas. The pre-stack elastic impedance inversion result was used to calculate the abnormal formation pressure factor,so as to predict the pressure distribution characteristics of shale formation in Jiaoshiba area. The prediction result of the new method shows higher accuracy than that of the traditional method. This research results can be applied to pressure prediction of shale formation and provide a theoretical reference for fine exploration of shale gas.