准噶尔盆地莫索湾地区油气成藏分析

OIL AND GAS ORIGIN AND RESERVOIRING ANALYSES OF MOSUOWAN REGION IN ZHUNGE'ER BASIN

文章对准噶尔盆地莫索湾地区侏罗系和白垩系油气地球化学特征、成因及其成藏条件、期次和时间进行了分析 ,油气源对比表明该区原油分为两类 ,第一类原油来源于盆 1井西凹陷二叠系下乌尔禾组烃源岩 ,第二类原油来源于盆 1井西凹陷二叠系风城组烃源岩 ,天然气与第一类原油同源。成藏条件分析表明莫索湾凸起位于盆 1井西凹陷和昌吉凹陷之间的隆起带 ,具有优越的烃源条件 ,白垩系和侏罗系的砂岩储集层发育 ,构造形成时间早于油气形成期。包裹体组分及均一温度研究表明该区侏罗系三工河组和白垩系吐谷鲁群油气为两期成藏 ,三工河组油气成藏时间为晚侏罗纪—早白垩纪 ,吐谷鲁群油气成藏时间晚白垩纪—早第三纪。

The geochemical characteristics, origin and reservoiring conditions, stage-time and time of oil and gas in Jurassic and Cretaceous in Mosuwan region in Zhunge er Basin are analyzed in the paper. Through hydrocarbon-to-source correlation, it was indicated that there are two types of crude oil in the region: the first type of crude oil coming from the source rocks of the Lower Wu' erhe Formation, Permian, in west Well Pen-1 Seg and the second from the source rocks of the Fengcheng Formation, Permian, in the seg; and the natural gas is cogenetic with the first type of crude oil. According to the analysis of reservoiring conditions, it was shown that, being in the uplift belt between the west well Pan-1 Seg and the Changji Seg, the Mosuowan Arch is of good reservoiring conditions, such as hydrocarbon source condition is superior; sandstone reservoirs are developed in Cretaceous and Jurassic; and structural formation time was earlier than hydrocarbon generation time, etc. In light of the research on the constituent and homogenization temperature of inclusion, it was indicated that the Sangonghe Formation reservoir of Jurassic and the Tugulu Group reservoir of Cretaceous were formed at different times, the reservoiring time of the former being the Later Jurassic - Early Cretaceous and that of the latter being the Later Cretaceous - Early Tertiary.