李敏,李双应,李振生,程成,谢伟
Li Min,Li Shuang-ying,Li Zhen-sheng,Cheng Cheng,Xie Wei
摘要: 合肥盆地是中国东部较大的含油气远景沉积盆地,但油气勘探一直未有突破。下白垩统朱巷组被认为是合肥盆地主要的烃源岩层之一,但对其沉积相和古地理的认识尚存在分歧,研究未受到足够的关注。根据野外剖面测量、沉积层序、沉积构造鉴别,以及岩石薄片显微观察和粒度分析,认为下白垩统朱巷组沉积物来自盆地东侧的张八岭隆起,主要为冲积沉积,冲积扇、河流、洪泛平原、滨湖—浅湖等沉积相带自东向西依次展布。大桥凹陷一带的朱巷组不发育深湖相沉积,不具备生烃条件,这不同于前人的认识;大桥凹陷古城地区钻孔揭示的原“朱巷组”暗色泥岩烃源岩层累计厚度在600m以上,是否属于下白垩统朱巷组需要进一步研究,其可能仅形成于郯庐断裂带内部的小型断陷盆地。郯庐断裂带中的小型断陷盆地可能是研究区油气勘探具有潜力的新领域。
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