利用二维盆地模拟软件BasinMod 2 D对四川盆地东部地区五百梯构造石炭系天然气的运聚成藏史进行了模拟。剖面模拟研究表明 ,志留系烃源岩分别于 2 10Ma前和 171Ma前开始进入生油、气门限 ,在 180～16 5Ma及 16 9～ 15 9Ma时处于生油、气高峰 ;于 175Ma前及 16 7Ma前进入排油、气门限 ,在 170～ 15 0Ma和16 6～ 16 1Ma处于排油、气高峰阶段。气藏内的油气运聚史可分为 3个阶段 :第一阶段为 172～ 16 5Ma ,原油首先在古隆起中聚集 ,形成古油藏 ;第二阶段为 16 5～ 16 0Ma ,源岩排出的天然气驱替已聚集的原油 ,形成古油气藏 ;第三阶段为 15 0～ 135Ma,原油裂解为天然气 ,形成古气藏 BasinMod 2 D, a two-dimensional basin modeling software, was used to simulate the migration and accumulation of Carboniferous natural gas in the 500-tectonic ladder in the eastern Sichuan Basin. The section simulation study shows that the Silurian source rocks begin to enter the oil generation and gas threshold before 210Ma and 171Ma respectively, and are at the peak of oil and gas production at 180-16 5Ma and 169-990Ma. Before 175Ma and 16 7Ma before entering the oil discharge, the valve limit, at 170 ~ 15 0Ma and 16 6 ~ 16 1Ma in the oil discharge, gas peak stage. The history of hydrocarbon accumulation in gas reservoirs can be divided into three stages: the first stage is 172 ~ 165Ma, the crude oil first aggregates in paleo-uplift to form paleo-oil reservoirs; the second stage is 165 ~ 160Ma, the source rocks are discharged Of the natural gas to displace the accumulated crude oil to form the ancient oil gas reservoir; the third stage is 150 ~ 135Ma, the crude oil is cracked into natural gas to form the ancient gas reservoir