A depositional pattern of beach bar in continental rift lake basins:A case study on the upper part of the fourth member of the Shahejie Formation in the Dongying Sag
2011; Science Press; Linguagem: Inglês
ISSN
2095-8927
Autores Tópico(s)Geological formations and processes
ResumoThe upper part of the fourth member of the Shahejie Formation in the Dongying Sag consists mainly of gravelly beach bar,sandy beach bar and carbonate beach bar.The present paper proposed that the formation of these beach bars showed a certain correlation with their sources,which was mainly influenced by combination of source type,source supply,hydrodynamic conditions and so on.There existed a significant difference in characteristics between the macro-distribution and the micro-deposition of beach bars in various regions of the Dongying Sag.Based on the detailed analysis of sedimentary characteristics,the paper divided beach bars of the upper part of the fourth member of the Shahejie Formation into several sedimentary systems,such as bedrock-beach bar,normal delta-beach bar,fan delta-beach bar and carbonate-beach bar.Consequently,the corresponding sedimentary patterns were established in order to provide guidance for oil and gas exploration in the Dongying Sag.
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