Accurate assessment of the formation rock permeability and porosity is crucial for geotechnical applications. For tight formation rocks, separate measurements of permeability and porosity result in high time costs and degraded accuracy. This contribution presents an improved straight-line method that allows simultaneous permeability and porosity determination in a single pulse-decay measurement. In the proposed method, the permeability is determined by the slope of the unilateral pressure changes in the semi-log plot versus time, and the porosity is obtained through the law of mass conservation. For the first time, three analytical expressions are derived that can give the value of the dimensionless equilibrium pressure without the need to reach the final equilibrium. These expressions also provide a practical way to determine the onset of the late-time stage, which helps to reduce the errors caused by mistaking the early-time data for the late-time one. The proposed method is applicable to both the two-chamber and the one-chamber pulse-decay measurements. The accuracy and practicability of the present method have been demonstrated through experimental measurements and literature data.

准确评估地层岩石的渗透性和孔隙度对于岩土工程应用至关重要。对于致密地层岩石，渗透率和孔隙度的单独测量会导致高时间成本和降低准确性。这一贡献提出了一种改进的直线方法，允许在单个脉冲衰减测量中同时确定渗透率和孔隙度。在所提出的方法中，渗透率由半对数图中单侧压力变化随时间的斜率确定，孔隙度通过质量守恒定律获得. 首次导出了三个解析表达式，可以给出无量纲平衡压力的值，而无需达到最终平衡。这些表达式还提供了一种确定后期阶段开始的实用方法，这有助于减少由于将早期数据误认为后期数据而导致的错误。所提出的方法适用于两腔和一腔脉冲衰减测量。通过实验测量和文献数据证明了本方法的准确性和实用性。