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地质历史上的生物礁主要为海相生物礁.海相生物礁中生物种类丰富,而且常常出现在正常的海洋环境中.陆相湖泊生物礁则极为少见,而且造礁生物种类单调,常常出现在特有的湖泊环境.山东东营凹陷古近纪湖相藻礁主要由绿藻门的枝管藻形成礁体的骨架,蓝细菌藻纹层起粘结作用.居礁生物种类十分单调,但数量丰富,主要包括广盐性的介形类、小型腹足类和龙介类.在湖相藻礁建造过程中,早期碳酸盐成岩作用产生的纤维状方解石十分发育,对加固枝管藻骨架起到了重要作用.同时,大量早期碳酸盐胶结物的存在表明当时湖泊水体的碳酸盐饱和度较高.藻礁发育的古近纪在世界许多地方出现蒸发岩沉积,反映藻礁总体是在气候比较干旱的时期形成的.枝管藻藻礁不但对古生态和气候具有重要的指示意义,而且对油气储集层的研究勘探也有重要价值.
Reefs in geologic history are dominated by marine reefs, which are abundant in marine reefs and often occur in normal marine environments. Terrestrial lake reefs are extremely rare and reef-building organisms are monotonous and often present In the unique lake environment, the Paleogene lacustrine algae reefs in the Dongying Sag, Shandong Province mainly consist of the reef skeleton formed by the algae of Chlorella, and the algae lamina play a bonding role. Rich, including broad salt of the Ostracoda, small gastropods and dragon mediated class in the algal algal reefs in the process of early carbonate diagenesis generated fibrous calcite is very developed, the reinforcement of the algae skeleton At the same time, the presence of a large number of early carbonate cements indicates that the carbonate lakes in the lake were highly saturated at that time.The Paleogene of algae reef developed evaporite deposits in many parts of the world, reflecting the overall Formed in the period of relatively dry climate.The branch algae algae reef not only has an important indication to palaeoclimate and climate, but also has important value for research exploration of oil and gas reservoirs.