Discovery and Its Geological Significance of Early Cretaceous Sporopollen Fossils in Da No. 1 Deep Well of Songliao Basin

详细信息   

• 责任者：Gao Ping (Exploration and Development Research Institute ; Daqing Oilfield Company ; Daqing 163712 ; China) ; Wan Chuanbiao
• 刊名：Petroleum Geology & Oilfield Development in Daqing
• 出版年：2011
• 卷期：30(4)
• 关键词：营城组 ; Yingcheng Formation ; 孢粉组合 ; palynological assemblage ; 古气候 ; paleoclimate ; 松辽平原 ; Songliao Plain
• 页码：p.35-39
• 图表：1 illus., 17 refs.
• 分类号：1200
• 出版序号：1111
• issnNo：ISSN1000-3754
• isbnNo：CN23-1286/TQ

摘要

Da No. 1 Deep Well is an important exploration well in Anda region. In order to solve the problem of the stratigraphie classification and contrast of this well, the sporopollen analyses for 33 samples are conducted by means of hydrofluoric acid-hydrochloride cold process method. In the sedimentary rock interbedded in basalt, the sporopollen fossils with the significances of determining the geological age and horizon are discovered, and then they are named the assemblage of Cyathidites-Perinopollenites-Protoconiferus. The characteristics of the assemblage are that Gymnospermae pollens are dominant （80. 0% ～96.0% ） , fern spores occupy less （4.0% ～20. 0%） , angiosperm pollens are not discovered and the content of Palaeoconiferus pollen with not-well-differentiated balloons in Gymnospermae pollens is extremely high. According to the assemblage features of the sporopollen fossils and integrating with the data of isotopes, lithology and electricity, the hole interval （3 221.0 ～3 723.0 m） of Da No. 1 Deep Well is classified into 11 individual layers from bottom to top and at the same time the set of pyroelastic formations is determined to be Yingcheng Formation, its geological age is Hauterivian-Barremian Age of Early Cretaceous Epoch. The predicted sedimentary environment of Yingcheng Formation belongs to subtropics-extratropical climate.