【摘要】 以石炭-二叠系探井揭露的地质资料为主要依据,结合岩石学、地球化学和储层物性测试等方法,研究了济阳坳陷石炭-二叠系致密砂岩气藏的沉积地质背景及生、储、盖地质条件,探讨了其成藏模式。研究表明:研究区石炭-二叠系海相-过渡相-陆相的沉积演化背景为致密气藏的形成提供了良好的生、储、盖组合条件;含煤地层腐殖型烃源岩有机质丰度高、成熟度高,生烃强度大,喜山期二次生烃作用显著;砂岩储层虽经历深埋和强烈压实、胶结作用,多具有低孔-低渗特征,但由于多次抬升和浅层地下水动力活跃等因素导致以溶蚀孔隙为代表的次生孔隙较为发育,具备了储集能力;发育良好的区域性厚层泥岩为致密砂岩气的保存提供了优质的盖层条件;济阳坳陷致密砂岩气藏主要形成于古生古储的多期间断式岩性构造组合圈闭。济阳坳陷石炭-二叠系具有良好的致密砂岩气藏勘探开发潜力。更多还原

【Abstract】 Based on the geologic data from exploratory well in Carboniferous and Permian System and combined with lithology,geochemical and method of reservoir property testing,the sedimentary geologic background and the conditions of oil genesis,reservoir and caprocks of the tight sandstone reservoirs in the Carboniferous and Permian System of Jiyang Depression were studied and its hydrocarbon accumulation pattern was discussed.The results indicated that the sedimentary evolution background of marine-transitional-continental facies in the Carboniferous and Permian System provided conditions of genesis,reservoir and caprock assemblage for the formation of tight sandstone gas,coal-bearing humus type hydrocarbon had high organic abundance and high maturity with intensive hydrocarbon genetic capacity.The sedimentary and tectogeneses were the basis of glutenite reservoirs.The active effect of shallow groundwater leads to the development of secondary porosity and the improvement of reservoir properties.The mudstone caprock is well-developed on the top of the gas reservoir.The anticline and fault produced by tectogenesis provide effective structural traps conditions for the gas reservoir.The tight gas in Jiyang Depression is produced in the upper Paleozoic stratum and stored in the same stratum and it is mainly from secondary hydrocarbon generation.Carboniferous-Permian stratum in Jiyang Depression has potential for good tight gas exploration and development potential.更多还原