At present,there is a lack of research results and applications on the mechanism of filling and reservoir formation and the lower limit of filling physical properties in tight sandstone.Through experiments such as gas filling simulation and microscopic pore roar analysis,the filling and reservoir formation stage and the lower limit of filling physical properties of tight sandstone gas reservoirs in a gas field in the East China Sea are analyzed.The study shows that there is a threshold pressure for reservoir formation in the process of gas filling,which is mainly non-Darcy seepage.The lower limit of porosity and permeability of industrial gas flow is 6.2%and 0.05mD respectively.The process of natural gas filling and reservoir formation is divided into three stages;The first stage:start the air intake stage,the second stage:the rapid growth stage of filling,and the third stage:the slow growth stage of filling.
关键词
致密砂岩气藏/物性下限值/孔隙度/渗透率/充注成藏
Key words
Tight sandstone gas reservoir/Lower limit value of physical properties/Porosity/Permeability/Filling and forming reservoirs
维普
万方数据