吉林大学学报(地球科学版) ›› 2015, Vol. 45 ›› Issue (4): 1060-1072.doi: 10.13278/j.cnki.jjuese.201504110
李志明1,2, 芮晓庆1,2, 黎茂稳1,2, 曹婷婷1,2, 徐二社1,2, 陶国亮1,2, 蒋启贵1,2
Li Zhiming1,2, Rui Xiaoqing1,2, Li Maowen1,2, Cao Tingting1,2, Xu Ershe1,2, Tao Guoliang1,2, Jiang Qigui1,2
摘要:
北美Williston 盆地Bakken组属典型的混合页岩油系统.笔者系统剖析了Bakken组混合页岩油系统富有机质层段和贫有机质层段的地质与地球化学、物性与裂缝发育以及页岩油特征,揭示了页岩油"甜点"主要受高含轻质油的富有机质成熟页岩、异常压力、微裂缝以及贫有机质层的白云石化作用共同控制,同时由于贫有机质层具有相对高的孔隙度、渗透率以及低的吸附量,因此可认为其是混合型页岩油系统中的主要产层.这对目前我国东部陆相页岩油勘探效果不佳的因素分析具有重要启示.把页岩油勘探目标层仅仅聚焦于富有机质泥页岩层段是勘探效果欠佳的主观因素;而富有机质泥页岩层段天然微裂缝发育局限、滞留油主要赋存在有机质中、热演化程度偏低使滞留油较重以及湖相Ⅰ型烃源岩生成的油含蜡量高等因素,是导致可采的页岩油量十分有限的客观因素.为此,针对我国东部湖盆页岩油的勘探,建议:加强成熟富有机质层系中贫有机质碳酸盐岩或粉砂、细砂岩薄夹层的精细评价与勘探;加强成熟富有机质泥页岩层段裂缝型页岩油的评价与勘探.
中图分类号:
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