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沉积学报  2015 

鄂尔多斯盆地新安边地区长7致密油特征及控制因素

DOI: 10.14027/j.cnki.cjxb.2015.03.021, PP. 625-632

Keywords: 控制因素,致密油,长7油层组,新安边地区,鄂尔多斯盆地

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Abstract:

鄂尔多斯盆地在新安边地区首次探明了致密油储量超亿吨级的新安边大油田。为了弄清致密油富集规律,在前人对沉积相、烃源岩、储层特征及致密化原因研究的基础上,利用铸体薄片、高压压汞、扫描电镜、岩芯物性、微米CT等分析手段,通过对烃源岩特征、储集砂体规模及其连通性、储层物性和源储接触关系等因素的研究,明确了新安边地区致密油的主要特征以及大面积展布的主要控制因素。延长组长72储集砂体发育,储层渗透率差,储集空间以微米级孔隙为主,微米孔隙及纳米喉道构成了由多个独立连通孔喉体构成的复杂孔喉网络,相对较好的孔喉连通性为石油在微观储集空间内流动提供了保障。原油性质好,具有低密度、低黏度、低凝固点、不含硫、可流动性强的特点。致密储层紧邻优质烃源岩,厚层烃源岩与较厚砂层共生形成了近源聚集的有利配置关系,生烃增压为石油运聚提供了充足动力,连片叠置发育的砂体和裂缝是油气运移的主要通道,原油充注程度高,多因素叠合形成了大面积展布的致密油区。

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