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APPLICATION OF PALYNOFACIES TO THE STUDY OF THE PALEOZOIC SOURCE ROCKS IN LOWER YANGTZE REGION
Author(s): ZHANG Miao1, CHEN Qinghua1, LIU Feng2, CAI Jingong2
Pages: 87-
92
Year: 2011
Issue:
3
Journal: Marine Geology & Quaternary Geology
Keyword: 孢粉相; 高成熟度烃源岩; 幕府山组; 栖霞组;
Abstract: 以下扬子下寒武统幕府山组泥、页岩和下二叠统栖霞组碳酸盐地层为研究对象,运用孢粉相方法,在明确有机质组成的基础上,分析了有机质的来源、类型及烃源岩形成环境。幕府山组有机质组成单一,无定形含量普遍在90%以上,低等水生生物是其主要来源,有机质类型以Ⅰ型为主,烃源岩分布较为集中,TOC高,类型好,是较深水、闭塞、准厌氧到厌氧的泻湖或海湾环境下的产物。栖霞组地层有机质组成变化较大,但仍以无定形为主,类型主要为混合型。由于沉积微环境变化频繁,水体缺氧程度极不稳定,导致栖霞组烃源岩层呈非均质分布,TOC偏低,类型相对较差。
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