关键词: 吐哈盆地, 鄯深构造, 三叠系, 油藏, 成藏条件, 包裹体, 成藏期

Abstract: The Shanke-1,a scientific research well,is the first well which penetrated the Triassic and encountered light oil in the Taibei Depression,Tuha Basin.Based on the analysis of Triassic oil-accumulating conditions,a study of organic inclusions and advanced thermometry,three oil-accumulating stages are identified for the Triassic pool in well Shanke-1.The first stage is in late Xishanyao of Middle Jurassic,forming a small oil accumulation with a low organic maturity.The second stage,or the main one,occurs in late Sanjianfang of Middle Jurassic,but the oil trapped in this stage has been oxidized into asphalt.The third stage,lasting from Late Jurassic to Early Cretaceous,has resulted in accumulation of light oil,forming a productivity in Shanke-1.In Taibei Depression of Tuha Basin,therefore,we should continue searching for non-oxidized oil trapped during the second stage,which will have a much higher productivity than that in Shanke-1.It is also emphasized that petroleum preservation conditions,together with source and reservoir rocks,have to be deeply studied.

Key words: Tuha Basin, Shanshen structure, Triassic, oil accumulation, accumulating stages