关键词: 济阳坳陷, 天然气藏, 突破压力, 泥岩盖层, 孔隙半径, 盖层评价, 浅层天然气, 天然气盖层, 形成机理, 分布类型

Abstract: The sealing ability of the cap rock is an important iactor in the formation and conservation of natural gas in a gas reservoir.Based on the results of study of lithology,thickness,and depth of burial of the cap rocks on Tertiary gas reservoirs,this paper gives a further study of the breakthrough pressure,median radius,concentrated pore size and its percentage,the amount of pores with a radius of less than 630,type of micropores distribution of the cap rock,3 grades of cap rocks are classified for their quantitative evaluation.The mechanism of the formation of a natural gas reservoir is demonstrated to give a basis for the understanding of the distribution of gas reservoir to promote future gas exploration.