用介形类优势分异度恢复古湖盆的水深——以山东东营凹陷古近系沙河街组沙三段湖盆为例
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摘要
从定量古生态学的角度出发,利用生态学和古生态学的资料,对介形类的优势分异度H(s)和古湖泊水深D的关系进行了相关性拟合,并得出了两者之间的关系。利用古近系东营三角洲地震资料和沉积学资料验证了这种对应关系的可信性,因此得出利用定量计算的介形类优势分异度值可以较准确地确定古水深。以东营凹陷古近系沙三段沉积时期为例,恢复了3个亚段沉积时期的古水深,并做出了平面等值线图。结果表明,东营凹陷的古水深由大到小依次为中亚段沉积时期、下亚段沉积时期和上亚段沉积时期。湖泊古水深的定量恢复,对于含油气盆地的油气生、储、盖研究具有重要的意义。
From the viewpoint of quantitative palaeoecology,the relationship is simulated and established between dominance diversity of Ostracoda (Hs) and water depth of palaeo-lacustrine basin (D) using ecology and palaeoecology data.The relationship is proved creditable based on seismic and sedimentary data of the Paleogene of Dongying Delta,thus the water depth can be accurately calculated using quantitatively calculated dominance diversity.Taking the sedimentary period of the Member of Shahejie Formation of Paleogene in Dongying Sag as an example,paleo-water depths of the submember sedimentary periods were recovered and the planar isoline maps were made.Results show that palaeo-water depths decreased from middle submember sedimentary period to lower submember sedimentary period and to upper submember sedimentary period in Dongying Sag.Quantitative recovery of water depth of palaeo-lacustrine basin is very important in the study of source rocks,reservoirs and caprocks of pertroliferous basin.
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