准噶尔盆地莫西庄-永进地区油气成藏差异分析

Difference analysis of oil and gas accumulation in Moxizhuang-Yongjin area of Junggar Basin

莫西庄-永进地区横跨车-莫古隆起南北两翼,古隆起对南北两翼不同区带油气成藏的差异控制作用明显,前期学者多局限于古隆起周边局部成藏特征研究,而古隆起两翼油气成藏差异性尚不明确。结合古隆起不同时期演化特征,对古隆起两翼油气的成藏期次及成藏过程进行恢复和对比,揭示了两翼成藏的差异性。研究表明,古隆起南翼为多期充注特征,发育含油高度大、原油密度高和含油饱和度高的原生油藏;核部为早期充注,发育小规模调整-保留型油藏;北翼以晚期充注为主,发育含油高度小、原油密度低、含油饱和度低的次生油藏。

Moxizhuang-Yongjin area crosses the northern and southern wings of Che-Mo paleo uplift,which has an obvious differential control effect on oil and gas accumulation in different zones in the northern and southern wings.Most previous scholars focused on the local reservoir forming characteristics around the paleo uplift,but the difference of oil and gas accumulation between the two wings is not clear.Combined with the evolution characteristics of different periods of paleo uplift,the reservoir forming stages and processes of oil and gas in the two wings are restored and compared,and the reservoir forming differences are revealed.The study shows the southern wing is characterized by multi-stage filling and primary oil reservoirs with high oil-bearing height,high oil density and high oil saturation are developed.In the southern part,the core is filled in early stage and a small-scale adjustment-retention reservoir is developed.While in the northern wing,it is dominated by late filling,and secondary reservoirs with low oil height,low crude oil density and low oil saturation are developed.