Elastic wave velocity characteristics of shale in different sedimentary environments of Permian Longtan Formation in Eastern Sichuan Basin
This paper selects the shale of Longtan Formation in Well FT1 in eastern Sichuan Basin for experimental test.Under the background of lithofacies division,the sedimentary environment of different lithofacies in the Longtan Formation in the eastern Sichuan Basin is analyzed using data from primary and trace elements.Combined with the influence of sedimentary environment on quartz genesis and TOC,the variation characteristics of elastic wave velocity in different sedimentary environ-ments are discussed.The results show that:①The mixed shale and clay shale are in a sedimentary environment with low paleoproductivity,rich oxygen,and high input of terrigenous debris.Siliceous shale is in a sedimentary environment with high paleoproductivity,poor oxygen,and low terrigenous debris input.Its quartz is mainly biogenic quartz with high TOC content.②Mixed shale and argillaceous shale use clay particles as rock skeleton;the elastic wave velocity is low,and the elastic wave velocity increases with quartz content.The siliceous shale takes quartz particles as the rock skeleton,and the elastic wave ve-locity is high,and the elastic wave velocity decreases with the quartz content.The research results can provide a basis for ex-ploring dominant lithofacies in Longtan Formation shale.
国家科技期刊平台
NSTL
万方数据
维普
