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Lacustrine fine-grained sedimentary features and organic-rich shale distribution pattern: A case study of Chang 7 Member of Triassic Yanchang Formation in Ordos Basin, NW China
Author(s): 
Pages: 34-43
Year: Issue:  1
Journal: Petroleum Exploration and Development

Keyword:  fine-grained sedimentorganic-rich shalerock texturedistribution patternTriassic Yanchang FormationOrdos Basin;
Abstract: 基于对细粒沉积学发展趋势的分析,指出完善针对性的研究方法、重建古沉积环境、建立细粒沉积岩分类体系与成因模式是目前学科研究的前沿.以鄂尔多斯盆地三叠系延长组长7油层组为例,应用岩心描述、薄片观察、X衍射、地球化学测试、有机碳测井定量计算等方法研究湖盆细粒沉积体系分布规律及主控因素.长7油层组富有机质页岩以湖侵—水体分层沉积模式为主.“沉积相带、水体深度、缺氧环境、湖流”是富有机质页岩形成与分布的主控因素.长73沉积期快速湖侵,湖水深度和范围急剧增加,湖泊表层水体与下层水体由于温度差异导致循环受阻,形成了深湖区大面积的缺氧环境,有利于富有机质页岩的大规模发育.远离三角洲前缘的宁静深湖区,富有机质页岩发育,有机碳含量高,干酪根以I型为主;发育砂质碎屑流的深湖区,富有机质页岩与砂岩互层,富有机质页岩有机碳含量高,干酪根以I-Ⅱ1型为主;邻近三角洲前缘的半深湖区,波状—块状粉砂质泥岩发育,干酪根以Ⅱ型为主.
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