四川盆地三叠系天然气地球化学特征及资源潜力分析  

Organic Geochemistry Characteristics and Resources Potential of Triassic Natural Gas in Sichuan Basin, China

作　　者：王兰生[1] 陈盛吉[1] 杜敏[1] 张鉴[1] 谢邦华[1] 李子荣[1] 

机构地区：[1]中国石油西南油气田分公司勘探开发研究院,四川成都610051

出　　处：《天然气地球科学》2008年第2期222-228,共7页Natural Gas Geoscience

摘　　要：简要介绍了四川盆地三叠系的总体勘探形势,认为该层系资源发现率和探明率不高,仍具有很好的勘探前景。通过分析四川盆地三叠系天然气的地球化学特征,指出该层系可划分为2个含油气系统,即志留系—中三叠统含油气系统和上三叠统—侏罗系含油气系统。通过研究四川盆地三叠系烃源岩地球化学特征、生气强度、展布特征等,定量评价出该层系油气资源总量为8.01×1012m3,同时指出了该层系天然气有利勘探领域。The lower and middle Triassic series in the Sichuan basin are formed in marine environment, most of the sediments are carbonate rocks, and the upper Triassic series are formed from marine to land environments, the sediments are mainly clastic rocks. The natural gas produced from the lower and middle Triassic comes mainly from shale source rocks, coal and carbonate source rocks in the Permian System, partly from the shale source rock in the Silurian System, some of them come from the lower and middle Triassic itself. The gas produced in the upper Triassic comes from coal bed in itself. So the gas produced from the Triassic System belongs to two petroleum systems, the former is the Silurian to lower and middle Triassic petroleum system and the latter is the upper Triassic to Jurassic petroleum system. The hydrocarbon source quantity and its generation intensity in Triassic gas pools in Siehuan Basin have been calculated based on its thickness, richness and maturation and according to the parameters acquired from the heat simulation test for the total organic carbon. The total gas generation quantity related to the lower Triassic gas pool is relatively high in the east, south, north and middle of the Sichuan basin. The total gas generation quantity related to the middle Triassic gas pool is relatively high in the east, middle, north and west of the Sichuan basin. Among them, the areas of high total gas generation quantity of the Silurian source rock are in eastern and southern Siehuan basin, the areas of relative high total gas generation quantityof the Permian source rock are in eastern, middle and northern Sichuan basin. The total gas generation quantity of lower Triassic source rock is slight. The area of highest total gas generation quantity of upper Triassic source rock is the western Sichuan basin, followed by the northern and middle, and the lowest is the eastern. The total oil generation quantity related to lower Triassic gas pools is relatively high in the east, south, middle and north of the Sichuan basi

关 键 词：四川盆地 三叠系 天然气地球化学 油气资源潜力 

分 类 号：TE122.113[石油与天然气工程—油气勘探]