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OALib Journal期刊
ISSN: 2333-9721
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准噶尔盆地哈拉阿拉特山地区原油成因类型及风城组烃源岩的发现意义
Keywords: 原油成因类型,油源对比,构造建模,风城组烃源岩,哈山地区
Abstract:
？通过对哈拉阿拉特山地区不同地质单元不同层系原油(油砂)色谱、色质等地球化学分析，系统解剖了原油的地球化学特征。根据原油的母质类型、沉积环境、成熟度和c20、c21、c23三环二萜烷分布特征，划分为3种成因类型:ⅰ类原油分布在浅层超剥带和逆冲推覆带浅部，为风城组烃源岩生成的低熟—成熟油，强烈生物降解，正构烷烃分布不完整，三环二萜烷呈上升型，高伽马蜡烷，富含β-胡萝卜烷；ⅱ类原油分布在逆冲推覆带中深部，为风城组烃源岩早期生成的低成熟油，未(或轻微)遭受生物降解，具有明显的植烷优势；ⅲ类原油集中分布在哈浅20井区超剥带西山窑组，主要为乌尔禾组烃源岩生成的高成熟油，混有少量风城组烃源岩生成的原油，具有姥鲛烷优势，低伽马蜡烷，低β-胡萝卜烷，三环二萜烷呈山峰型。通过山前带地质建模和构造变形分析，提出哈山石炭系逆冲推覆体下发育厚层的风城组烃源岩，其向北可延伸至达尔布特断裂附近，使研究区烃源岩分布扩大了近1000km2，该认识无疑扩大了研究区的找油范围，对拓展准北缘地区的油气勘探领域具有重要意义。
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