Abstract The deep source material mainly enters the sedimentary rock through volcanic activity or hydrothermal activity. The lower member of Xiguayuan Formation in Luanping Basin is a set of fine-grained sedimentary rocks affected by deep source material,so thin section observation and geochemical analysis were carried out to study the influence of deep source material on the environment and hydrocarbon accumulation in the study area. The results show that the deep source material in the lower member of Xiguayuan Formation mainly entered the sedimentary rocks through underwater volcanic eruptions and hydrothermal jet activities. Through the variation law of environmental indicators(Th/U,V/Cr,V/(V+Ni),CIW,Sr/Cu,etc.),it is found that hydrothermal jet activities have frequent and severe short-term effects on the environment,while underwater volcanic eruptions have occasional,weak long-term effects on the environment. By comparing the organic-rich layer with the hydrothermal strength index((Fe+Mn)/Ti,Al/(Al+Fe+Mn)),it is found that the organic-rich layer has high value of (Fe+Mn)/Ti,low value of Al/(Al+Fe+Mn)characteristics. According to the above studies,the participation of deep source materials has greatly improved the ancient productivity,and its eruption and jet flow mechanism has made the water body anoxic and stratified,providing good preservation conditions for organic matter.
Fund:National Science and Technology Major Project(No.2017ZX05009-002)and the National Natural Science Foundation of China(No.41772090)
Corresponding Authors:
ZHANG Yuanfu,born in 1979,received a doctorate degree in energy geoengineering from China University of Geosciences(Beijing)in 2008. Now he is a professor and doctoral supervisor at the School of Energy,China University of Geosciences(Beijing),mainly engaged in sedimentology and sequence stratigraphy research.E-mail: zhangyuanfu@163.com.
About author: ZHAO Jianlong,born in 1999,received a bachelor's degree from China University of Geosciences(Beijing)in 2021,and is a master's student at China University of Geosciences(Beijing),mainly engaged in sedimentology research.E-mail: 1487658146@qq.com.
Cite this article:
ZHAO Jianlong,ZHANG Yuanfu,YUAN Xiaodong et al. Effects of deep source materials on palaeoenvironment and hydrocarbon accumulation in the Cretaceous Xiguayuan Formation,Luanping Basin[J]. JOPC, 2023, 25(6): 1394-1406.
ZHAO Jianlong,ZHANG Yuanfu,YUAN Xiaodong et al. Effects of deep source materials on palaeoenvironment and hydrocarbon accumulation in the Cretaceous Xiguayuan Formation,Luanping Basin[J]. JOPC, 2023, 25(6): 1394-1406.
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