关键词: 准噶尔盆地, 燕山运动, 喜马拉雅运动, 构造, 油气运移, 油气聚集

Abstract: The effect of Yanshan movement and Himalayan orogeny on hydrocarbon migration and accumulation in Junggar basin is analyzed.It is pointed out that the all orogenies before Yanshan movement in Junggar basin, including Indosinian orogeny, brought up the rudiment structural framework and took effects of reconstructions in detail, hence, more influencing the petroleum migration and accumulation withinthe basin. The early Yanshan movement was dominated by undulatory motion,whereas the late Yanshan movement by ascending motion,which created the conditions for hydrocarbon generated by multiple circles migrating toward overlap pinchout and lithologic pinchout zones.In the late Cretaceous, Luliang area and its south slope belt were in ascending stage, thus providing conditions for hydrocarbon formed in un-derly ing source sequences migrating upward along the unconformity and accumulating into better Cretaceous reservoirs.In the third episodeof Himalayan movement (the end of Late Pliocene), the only folding movement took place in the basin, and forming three-row anticlines at itsouth-marginal foreland sag, allowing the structures and hydrocarbon distribution to be complicated. They were not greatly effected the strataframework within the basin, but somewhat influenced the re-migration of hydrocarbons there. Therefore, the effect of Himalayan orogenyshould be considered for oil-gas exploration in southern and northern margins (Luliang and Xiazijie areas) of Junggar basin.

Key words: Junggar basin, Yanshan movement, Himalay an movement, structure, hydrocarbon migration, hydrocarbon accumulation