Fluid identification method for tight sandstone reservoir

The embodiment of the invention discloses a fluid identification method for a tight sandstone reservoir. The method comprises the following steps: determining values of at least two parameters for distinguishing formation fluid on each sampling point in the tight sandstone reservoir; calculating the values of the at least two parameters on the same sampling point by using a preset gas-bearing index calculation strategy to obtain the gas-bearing index of each sampling point; according to the gas-bearing index, the formation resistivity and the reservoir test data of each sampling point, establishing a corresponding relation among the gas-bearing index, the formation resistivity and the gas-water boundary value; and identifying the fluid of the tight sandstone reservoir by using the corresponding relation of the gas-bearing index, the formation resistivity and the gas-water boundary value. 本申请实施例公开了一种致密砂岩储层的流体识别方法。所述方法包括：确定致密砂岩储层中每个采样点上用于区分地层流体的至少两个参数的数值；利用预先设置的含气指数的计算策略，对同一个采样点上至少两个参数的数值进行计算，得到每个采样点的含气指数；根据每个采