地质学报2016，Vol.90Issue(4)：615-627,13.
羌塘盆地隆鄂尼-昂达尔错古油藏逆冲推覆构造隆升
Thrust and Uplift of the Lung’erni-Angdarco Paleo-Oil Reservoirs in the Qiangtang Basin
摘要
Abstract
Regional thrust systems have been discovered along the Lung ’erni-Angdarco belt of paleo-oil reservoirs in the southern Qiangtang Basin.The Jurassic oil-bearing dolomite and marine hydrocarbon source rocks thrust southward along gentle-dipping faults over the Upper Cretaceous red-beds in the eastern and western Beileico,northwestern Lung’erni,southeastern Bilogco Lake and surrounding areas of the Luxungco Lake,and the Middle Jurassic oil-bearing carbonate and clastic sedimentary rocks thrust southward over the Triassic dark clastic rocks in northwestern Angdarco Lake,which formed variety of thrust sheets,thrust slices,nappes and structural windows.High-resolution 2D seismic reflection profile reveals duplex thrust systems at different depths occur in the Lung’erni-Angdarco paleo-oil reservoirs. The oil-bearing dolomite of the Middle Jurassic Buqu Formation in Bilogco moved southward along the upper duplex thrust for about 7~11 km and 12 ~15 km,resulting in the formation of the Lung’erni and Deruri palaeo-oil reservoirs.The underlying Triassic and Carboniferous-Permian sheets thrust in a large scale from north to south along lower duplex thrust,with frontiers of the thrust offset by the northward thrust faults.Field observation indicates that many thrust sheets and nappes of Jurassic limestone and dolomite occur in the transition zone between the paleo-oil reservoir belt in the south of Central Qiangtang Uplift and the oil seepage zone in the north of Central Qiangtang Uplift.The explanation for the deep seismic reflection profile further suggests that the Triassic and Jurassic marine hydrocarbon source rocks in the northern Qiangtang Basin thrust southward over the Central Qiangtang Uplift to form the Middle Jurassic oil-bearing dolomite and paleo-oil reservoirs in the Beileico and Luxungco Lakes, southern Qiangtang basin.It can be inferred that uplift of the oil-bearing dolomite and Jurassic hydrocarbon source rocks caused by regional southward thrust in the Late Cretaceous-Early Tertiary led to formation of the Lung’erni-Angdarco paleo-oil reservoirs.关键词
羌塘盆地/古油藏/逆冲推覆/构造隆升/青藏高原北部Key words
Qiangtang Basin/Paleo-oil reservoir/thrust/tectonic uplift/Northern Tibetan Plateau引用本文复制引用
吴珍汉,刘志伟,赵珍,季长军,叶培盛..羌塘盆地隆鄂尼-昂达尔错古油藏逆冲推覆构造隆升[J].地质学报,2016,90(4):615-627,13.基金项目
本文为地质矿产调查评价专项羌塘盆地油气地质构造保存条件研究项目（1212011221111）及西藏羌塘盆地油气地质构造保存条件调查项目（12120115000901）联合资助的成果。 （）
