The formation water evaporates seriously because of the drastic pressure change in near-well zone during the exploitation of deep high temperature gas reservoir. The crystallization salt precipitates in the formation when the salt concentration of formation water increases to solubility limit, which results in the decrease of reservoir porosity and permeability. At present, there is a lack of the prediction and process design of salting out in deep high temperature gas reservoirs. The evaporation salting out experiment of formation water was carried out firstly in this paper, and the volume model of salting out zone was established based on the water content model of natural gas, the porosity and permeability model of reservoir, and the kinetics model of salting out. And the characterization method of predicting porosity and permeability of high temperature gas reservoir after salting out was established by fitting and modifying the model finally, which could provide a theoretical basis for salting out plugging formation in depressurization production of gas reservoirs and laid a foundation for the efficient development of deep high temperature gas reservoirs.

深部高温气藏开采过程中，近井区压力变化剧烈，地层水蒸发严重。当地层水的盐浓度增加到溶解度极限时，结晶盐在地层中析出，导致储层孔隙度和渗透率降低。目前，缺乏对深层高温气藏盐析的预测和工艺设计。本文首先开展了地层水蒸发盐析实验，基于天然气含水量模型、储层孔渗模型、盐析动力学模型建立盐析带体积模型。出去。