胡瀚文1,张元元2,卓勤功3,贾承造3,郭召杰2
Hu Han-wen1,Zhang Yuan-yuan2,Zhuo Qin-gong3,Jia Cheng-zao3,Guo Zhao-jie2
摘要: 准噶尔盆地南缘的二叠系—侏罗系含油气系统为该盆地的重要勘探领域,潜力大,但对其油气成藏过程的认识仍存在分歧。通过分析原油性质,并应用流体包裹体观察、测温和盆地模拟以及储层颗粒荧光等多种技术方法,解析南缘山前齐古油田的油气充注过程。结果表明南缘齐古油田原油密度大且含蜡量高,气洗特征显著;不同层位储层中烃类族组分分异的现象明显。早期低成熟度的油气在~100Ma充注于下侏罗统储层,在~45Ma充注于中侏罗统储层,形成自生自储的古油藏。晚新生代(~7Ma)是齐古油田的主要成藏期,在断裂的作用下,古油藏被调整,深部高成熟度的原油和天然气沿断裂运移,二叠系—侏罗系储层发生气洗作用,导致不同层位储层内的油气分布复杂。由于齐古背斜下白垩统区域盖层缺失和断裂沟通地表,导致浅部中侏罗统西山窑组储层油气严重散失,油气藏被破坏;而在中下侏罗统局部盖层的保护下,二叠系—下侏罗统油气藏得以保存。
中图分类号:
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