南塔吉克盆地油气地质特征

对南塔吉克盆地的地层、沉积、构造和石油地质特征等进行了综合研究。该盆地的烃源岩为古近系、白垩系和侏罗系的滨浅海相与湖相泥岩、页岩和灰岩,有多套含油气层系,主要含油储集层为古近系的滨浅海相碳酸盐岩和砂岩,主要含气储集层为白垩系与上侏罗统滨浅海相碳酸盐岩和砂岩,上侏罗统膏盐岩为气藏的区域性盖层,白垩系和古近系的泥膏岩和泥灰岩为区域性和局部油气盖层,油气主要运移期和聚集期发生在晚白垩世与早上新世,油气圈闭和油气田(藏)主要有构造型、构造-地层复合型和地层型等3种。

Petroleum Geology of South Tajikistan Basin in Central Asia

An integrated study on lithology, sedimentology, structural feature and petroleum geology in South Tajikistan basin is carried out. The source rocks of this basin are characterized by marine and lagoon and limnic mudstone, shale and limestone of Eogene, Cretaceous and Jurassic, with multiple petroliferous strata. The main oil reservoir features marine carbonate rocks and sandstone of Eogene and the main gas reservoir is offshore carbonate rock and sandstone of Cretaceous and Upper Jurassic in which gypsolyte becomes the regional cap rock of gas reservoir, while the muddy gypsolyte and marl of Cretaceous and Eogene are the regional or local cap rocks of oil-gas reservoir. The major stages of petroleum migration and accumulation occur in the Late Cretaceous and Early Pliocene. There exist three types of petroleum traps and reservoirs such as structural, structural-stratigraphic and stratigraphic ones in this basin.