关键词: 特提斯构造域, 烃源岩, 储集层, 盖层, 保存条件, 油气勘探

Abstract: A giant belt for oil and natural gas accumulation in the world is the Tethys-tectonic domain where some of the well-known largest oil bearing basins are situated, such as the Persian Golf Basin, the Northern Caucasus Oil Bearing Area and the Surt Basin. The Tethys-tectonic domain in Tibet is a frontier for petroleum exploration. According to the out-crop data from the area, though the poor condition for petroleum accumulation, a good one can be predicted at the sub-ground. The Tethys-tectonic domain in Tibet had the same tectonic background, sedimentary environment and hydrocarbon source rocks as the Tethys-tectonic domain at other places in the world. The reservoir's porosity and permeability in the Tethys-tectonic domain in Tibet is poor because a strong tectonism during the Yanshanian and Himalayan periods, which made the hytrocarbon preserving condition become poor. Thus, the middle and small oil fields at the Tethys-tectonic domain in Tibet is a main target for petroleum exploration.

Key words: Tethys-tectonic domain, Hydrocarbon source rocks Reservoir, Seals, Preserving condition Petroleum exploration