准噶尔盆地陆西地区油气成藏条件与模式研究

准噶尔盆地陆西地区成藏条件分析表明，该区具有形成油气藏的良好条件。玛北、玛东和夏盐地区的油气主要来源于玛湖凹陷的风城组，陆中地区的石西、石南、陆梁油田的油气主要来源于盆1井西凹陷的下乌尔禾组及风城组；储集条件好，且夏盐地区好于玛东地区；该区主要发育不整合、岩性圈闭，圈-源匹配良好，圈闭形成于二叠纪，三叠纪中晚期和侏罗纪末~白垩纪为成藏期；输导层主要为断层、层内渗透层和不整合面；二叠系各层系顶界和三叠系顶界不整合面上油气的运移仅发生于陆西斜坡区，西山窑组顶界和侏罗系顶界不整合面上油气的运移主要发生在隆起区；陆西地区存在两种类型的成藏模式，一是三叠纪“源内-不整合-断控原生油气藏”成藏模式；二是侏罗—白垩纪“源外-不整合-断控-阶状”成藏模式。最后认为，陆西地区与不整合有关的地层油气藏有利目标区主要位于陆西斜坡区、三个泉油田与石南油田接合处及三南凹陷南段。

THE CONDITION AND PATTERN OF RESERVOIR FORMATION AT LUXI AREA IN JUNGGAR BASIN

The condition and pattern of reservoir formation at Luxi area are studied in this paper. On the basis of the study, it is pointed out that the condition of reservoir formation is favorate. The source rock is mainly the Fengcheng Formatiom of Mahu trough at Mabei and Madong Xiayan area, and the lower Wuerhe and Fengcheng Formatiom of West trough of Pen well 1 of Shixi and Shinan oil field in Luzhong area. The reservoir condition is good, and the reservoir condition in Xiayan area is better than that in Madong area. The main trap is unconformity and lithological trap. The trap formed in Permian period and the oil or gas migrated and accumulated in middle, last Triassic period, Jurassic period and Cretaceous period. The main transporting passage of oil and gas is faults and the permeabale layer and unconformity surface. The migration of oil and gas at top boundary unconformity of all strata of the Permian system and the Triassic system exists only on the slope in Luxi area. The migration of oil and gas at top boundary unconformity of Xishanyao Formation and Jurassic system exist mostly in the uplift of Luxi area. There are two kinds reservoir patterns including side of sourceunconformityslopezone type and outside source unconformityfault controlsteps type in Luxi area. Finally the favorable objects of reservoir in the strata related with unconformity include the slope area in Luxi area, the jointing area of Sangequan Oilfield and Shinan Oilfield, and the southern member of Sannan Depression in Junggar Basin.