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烃源岩形成研究一直集中于海相盆地的“生产力模式”和“保存模式”之争,湖相盆地研究较少.利用二连盆地烃源岩有机碳、碳酸盐碳同位素、热解参数、还原硫等地球化学分析数据,表征了湖盆古生产力和陆源有机质输入,研究了有机质供给和保存在烃源岩形成中的控制作用,发现不同的湖盆中有机质供给和保存对烃源岩形成的控制作用明显不同.有机质供给量大的湖盆原始有机质含量高,烃源岩形成主要受有机质供给控制,受有机质保存条件影响小,即使在含氧的水底也会有部分有机质来不及氧化而富集形成烃源岩;有机质供给量小的湖盆原始有机质含量低,氧化环境中大部分有机质被降解难以形成烃源岩,只有还原环境下有机质才能得到较好的保存,有机质保存是控制烃源岩形成的主要因素.
The study on the formation of source rocks has been focused on the controversy between “productivity mode” and “preservation mode” in marine basins, and few studies on the lacustrine basin.Based on the organic carbon and carbonate carbon isotopes of source rocks in the Erlian Basin, Pyrolysis parameters, sulfur reduction and other geochemical data, characterizing the ancient productivity of the lake basin and the input of terrigenous organic matter, and studying the controlling role of the supply and preservation of organic matter in the formation of source rocks. It was found that the supply and preservation of organic matter in different lake basins The controlling role of source rock formation is obviously different.However, the organic matter with high organic matter abundance has high original organic matter content and the formation of source rock is mainly controlled by organic matter supply, and is less affected by the preservation conditions of organic matter, and some organic matter Too late to oxidize and enrich the formation of source rocks. The organic matter with low organic matter content has low original organic matter content, most of the organic matter in the oxidized environment is difficult to be degraded to form source rocks. Only in the reducing environment can the organic matter be well preserved and the organic matter preserved It is the main factor to control the formation of source rocks.