关键词: 构造运动, 油气成藏, 勘探, 储量, 中国西部

Abstract: The basins of western China are composed of small crust massifs and their petroleum geological features can be summarized from five aspects.The first feature is that in terms of plate movements,the western basins has experienced several times of tectonic events and subsidence,which made the hydrocarbon resources dispersed.The second feature is that the western basins have multiple overlapping petroleum systems with multiple source rocks,multiple phases of source rock evolution and multiple times of hydrocarbon accumulation.Different area of each basin has its own main source rocks.The Paleozoic source rock is mainly centralized in the craton area and the Mesozoic source rock is mainly centralized in foreland basin and depressions.The third feature is that the western basins have two tectonic strata and multiple sedimentary sequences,which determines that there exists multiple reservoirs.The fourth feature is that the western basins have multiple source-reservoir-seal combinations,which determines the multiple targets and the complex exploration.The fifth feature is that the western basins have different kind of pools.In the foreland over-thrusts,oil and gas occur mainly in Mesozoic and Cenozoic strata,structural pools are the dominating type.In the cratonic area,oil and gas occur both in Paleozoic and Mesozoic strata with multiple types of pools including tectonic pools,lithologic pools and composite pools.According to these features,the most important exploration fields are centralized in paleo-uplift,forland basin and stratigraphic and lithologic pool on the positive structures.In the past ten years,the annual oil and gas reserves have been increasing quickly.It is estimated that the annual oil and gas reserves will increase 50-70 million tons and 150-200 billion cubic meters in the next 10 years.

Key words: tectonic movement, hydrocarbon accumulation, exploration, reserve, western China