Low-permeability tight sandstone porosity logging method

The low-permeability tight sandstone porosity logging method comprises the steps that sound waves of a logging curve are obtained, and the transverse wave time difference is predicted according to the longitudinal wave time difference of the sound waves; calculating a dynamic Poisson's ratio according to the transverse wave time difference and the longitudinal wave time difference; and calculating the porosity of the sandstone according to the dynamic Poisson's ratio. The porosity calculation method with higher universality is established by utilizing the traditional advantage of predicting the porosity of the sandstone based on sound waves and shale content and considering the Poisson's ratio change caused by both shale and calcareous cementation. 本发明提供的一种低渗致密砂岩孔隙度测井方法包括：获取测井曲线的声波，并根据所述声波的纵波时差预测横波时差；根据所述横波时差和所述纵波时差计算动态泊松比；根据所述动态泊松比计算砂岩孔隙度。利用传统的基于声波和泥质含量预测砂岩孔隙度的优势，考虑到泥质和钙质胶结均导致泊松比改变，建立更具普适性的孔隙度计算方法。