关键词: 烃源岩, 成熟度, 稀油成藏, 控制因素, 白音查干凹陷

Abstract: There are three sets of source rock in Baiyinchagan Depression,from below to the above are: Aershan Formation, Tenggeer Formation and fhthongmu Formation(include Du section one, Du section two and Du section three).The first two sets of Aershan and Tenggeer Formations are over-mature to mature source rock, but Duhongmu Formation is still in low-mature to immature stage. The research on oil source contrast and the analysis of organic geochemistry indicate that there are three. sorts of different origins thin oil besides heavy oil in the depression, thin oil accumulation stages can be divided into four periods, and the models of accumulation vary along with different periods. Exploration practice shows that main control factors of thin oil accumulation are source sag, combination of source-reservoir-cap, sedimentary fades zones and the structure background. Future exploration of the Depression should be evolved from the front structure of adjacent source sag.

Key words: hydrocarbon source rock, mature, thin oil accumulation, control factor, Baiyinchagan Depression