关键词: 准噶尔盆地, 油气藏, 油气显示, 油气聚集, 保存量, 散失量

Abstract: Despite the fact that it is complicated for tectonic movement in the northwest edge of Junggar Basin and there are many factors for destruction of hydrocarbon accumulation and indication such as dense oil,oil sand and bitumen,it is still the most accumulated area for hydrocarbon.The analysis on destructive factors of oil and gas pools shows that there are three primary destructive types of factors,including rupture activety,up-lifting of oil pool and fold alteration.Using basin modeling,FASPUM and geoanchored methods,the amounts of initial hydrocarbon accumulation,preservation,destruction,residue and loss were calculated respectively.The whole quantity of hydrocarbon loss accounts for 72.1% to 78.1% of initial hydrocarbon accumulation in the northwest edge of Junngar Basis.The biggest loss was produced in Mid-Late Mesozoic,and the bigger loss was in Late Paleozoic,and the smallest loss was in Cenozoic.The loss distribution are related to rich source,single-slope structure,hydrocarbon multi-period accumulation,long multi-period loss,and destructive multifactors.

Key words: Junggar Basin, oil and gas pool, oil and gas shows, hydrocarbon accumulation, preservation quantity, destruction