塔里木盆地台盆区奥陶系储层烃包裹体成熟度

利用生物标志化合物的构型异构特征,通过色谱-质谱分析技术(GC-MS)研究塔里木盆地台盆区烃包裹体的甾烷和藿烷参数特征来分析区内烃包裹体的成熟度。塔北和塔中地区海相碳酸盐岩烃包裹体主要为中—高成熟度,不同地区及期次可能有细微差异:塔北地区晚海西期烃包裹体成熟度在各地区相差较大,牙哈—金跃—热普地区烃包裹体均达到高成熟而其他地区为成熟;塔中地区晚海西期和燕山期—喜马拉雅期烃包裹体成熟度整体上比塔北地区高,认为相同期次油气充注时间比塔北地区相对较晚。塔中地区储集层原油成熟度整体比塔北地区低,说明塔北地区受后期改造作用较强。塔北地区油气以晚海西期和燕山期—喜马拉雅期两期油气为主要贡献,塔中地区燕山期—喜马拉雅期油气贡献度更大。

Hydrocarbon inclusion maturity of Ordovician reservoirs in craton area of Tarim Basin

Based on the configuration heterogeneous characteristics of biomarkers, the sterane and hopanoid characteristics of hydrocarbon inclusions in craton area of Tarim Basin are studied using chromatography-mass spectrometry (GC-MS), so as to analyze the maturity of hydrocarbon inclusions. The hydrocarbon inclusions of marine carbonates in North Tarim and Central Tarim mainly show mid-high maturity, and slight differences might exist among different regions and stages. In North Tarim during the Late Hercynian, the maturity of hydrocarbon inclusions varied a lot in each region. Hydrocarbon inclusions in Yaha-Jinyue-Repu area were highly mature, while mature in other regions. As compared with North Tarim, the maturity of hydrocarbon inclusions was comprehensively higher in Central Tarim during the Late Hercynian and Yanshan-Himalayan, where hydrocarbon charging in the same stage was considered posterior to North Tarim. The maturity of crude oil in Central Tarim was lower than that in North Tarim as a whole, indicating that North Tarim underwent more severe late reformation. The hydrocarbons in both Hercynian and Yanshan-Himalayan stages made a major contribution in North Tarim, while those had a greater contribution in Central Tarim.