【摘要】 以野外剖面、岩心观察描述、薄片和古生物鉴定为依据,结合区域构造-沉积背景,对贵州大方地区上二叠统龙潭组沉积相特征进行研究,确定该地层单元属于三角洲和滨岸沉积环境,识别出三角洲平原、三角洲前缘、前三角洲、潮坪和泻湖等5种沉积亚相和众多微相类型。以单井沉积相分析和连井沉积相剖面对比为基础,编制沉积相平面分布图,显示龙潭组中西部为三角洲沉积,东部为滨岸相沉积。更多还原

【Abstract】 This paper has a discussion on sedimentary facies of the Upper Permian Longtan Formation in the Dafang region, Guizhou based on observed section, core and thin section study and fossils in combination with regional tectonic and sedimentary setting. The study indicates that the Longtan Formation in the studied region was deposited under delta and onshore conditions and may be divided into deltaic coastal plain facies,delta-front facies, prodelta facies, tidal flat facies and lagoon facies. The compiled sedimentary facies distribution map shows that the Longtan Formation in the east belongs to onshore facies and in the center and west belongs to delta facies.更多还原