中文摘要：

致密砂岩气成藏过程复杂,而有利的成藏要素是连续型致密砂岩气大规模运聚成藏的基本条件,因此明确成藏条件及成藏过程对致密砂岩气理论研究及勘探实践都具有重要意义。利用烃源岩地球化学数据、地层测试数据、综合测井数据等资料并结合前人研究,对苏里格地区上古生界连续型致密砂岩气藏形成的主要因素（烃源岩、储集层、盖层、构造运动）进行了分析,总结了研究区连续型致密砂岩气的有利成藏条件并剖析了其成藏过程。研究表明：烃源岩广覆式生烃,源储紧邻,大面积分布的致密储层,有效的区域盖层及相对稳定的构造环境是苏里格地区上古生界连续型致密砂岩气成藏的可靠保证;研究区致密气砂岩成藏孔隙度下限约为2%;苏里格地区上古生界连续型致密砂岩气藏形成过程可以分为4个演化阶段：早侏罗世前的连续型致密砂岩气藏孕育阶段,即致密储层形成阶段;中侏罗世天然气开始大规模持续充注,为连续型致密砂岩气藏发展阶段;早白垩世气藏规模达到最大,为连续型致密砂岩气藏成型阶段;晚白垩世到现今为气藏萎缩阶段。

英文摘要：

Process of tight sandstone gas accumulation is complicated,while favorable accumulation elements are the basic conditions of continuous tight sandstone gas′s massive accumulation.Therefore,understanding accumulation conditions and process of tight sandstone gas has great significance both for the tight gas reservoir theory study and exploration practice.This paper mainly uses source rock data,formation testing data and logging data and previous studies as well to analyze and summarize the main controlling factors（source rock,reservoir,cap rock and tectonic movement）of tight gas accumulation of the Upper Paleozoic in Sulige area.Results show that the tight gas accumulation in the Upper Paleozoic is guaranteed by widely covered hydrocarbon generation of the source rocks,the closed distance between the source rock and the reservoir,the distribution of tight reservoir in large areas,effective regional cap rocks and relatively stable tectonic environment.The tight gas reservoir porosity lower limit in the study area is about 2%.The formation process of the tight gas in the study area can be divided into four evolution stages：tight reservoir forming stage before Early Jurassic,large scale continuous filling stage in Middle Jurassic,the maximum development of gas reservoir in the Early Cretaceous,and the shrinking stage of the gas reservoir from the Late Cretaceous to the present.