高永亮1,文志刚1,李威2
Gao Yong-liang1,Wen Zhi-gang1,Li Wei2
摘要: 以鄂尔多斯盆地陇东地区三叠系延长组长7油层组为例,在岩心描述与测井解释的基础上,应用岩石热解、同位素测定、显微组分分析、气相色谱、色谱—质谱等技术方法,深入剖析湖相富有机质细粒沉积岩的地质、地球化学特征,研究细粒沉积岩的展布情况,并探讨其对致密油成藏的作用。结果表明:湖相富有机质细粒沉积岩按照岩性及结构的不同可分为富有机质页岩及富有机质泥岩,富有机质页岩沉积于水体安静缺氧的深湖环境中,水体分层明显,有机质丰度高,主要来源于浮游生物和底栖藻类生物;富有机质泥岩主要沉积于水体相对略浅的半深湖环境中,水体盐度相对较低,有机质丰度低,为浮游生物和陆源碎屑物质的混合来源。陇东地区富有机质细粒沉积岩发育最厚的区域位于八珠—马岭—庆城—华池一带,其中富有机质页岩主要发育于长73亚段,富有机质泥岩在长7段各个亚段均有所发育。陇东地区致密油在长7浊积砂体中广泛分布,其油源主要为长73亚段富有机质页岩,油层的展布受控于富有机质细粒沉积岩的发育程度。
中图分类号:
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