周国晓,魏国齐,胡国艺
Zhou Guo-xiao,Wei Guo-qi,Hu Guo-yi
摘要: 四川盆地龙岗气田与元坝气田地理位置毗邻,但其陆相层系气源存在差异。根据天然气组分、烷烃气的稳定碳、氢同位素组成特征,将中、上三叠统划分为T2l—T3x1-2和T3x3-6 2个油气系统,前者具有煤成气与油型气混合成因的特点,后者属于单一煤成气;中、下侏罗统也可分为2个油气系统,中侏罗统在2个地区均为自生油型气气藏;下侏罗统在元坝地区是以T3x3-6为气源的次生煤成气气藏,在龙岗地区属于自生油型气气藏。另外,天然气组分iC4/nC4值等于1可作为判识天然气类型的指标,随着干燥系数的增加,iC4/nC4值有下降的趋势,在成熟阶段减小速度缓慢,在高、过成熟阶段,快速降低;须家河组甲烷氢同位素值异常偏高,不同于下伏海相和上覆内陆淡水湖相所代表的甲烷氢同位素特征,可为半咸水环境下发育的沉积有机质所形成甲烷的氢同位素提供借鉴。
中图分类号:
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