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- Title
准噶尔盆地玛湖凹陷风城组烃源岩沉积古环境.
- Authors
唐 勇; 郑孟林; 王霞田; 王 韬; 谢再波; 秦 臻; 黑晨露
- Abstract
An important set of source rocks is developed in Fengcheng Formation of Lower Permian in Junggar Basin. This research took full advantages of ICP-MS,XRF in the measurements around major elements and trace elements,along with biomarkers of saturated hydrocarbons in 25 source rock samples from Fengcheng Formation in Well Maye 1,Mahu Sag. Based on previous research results,the geochemical characteristics and sedimentary paleoenvironment of the source rocks of Fengcheng Formation in Mahu Sag were comprehensively studied. The research demonstrated that the sedimentary evolution of Fengcheng Formation can be divided into five stages. The first and second stages(sedimentary period of Feng1 section)were mainly defined as evapora⁃ tion and salinization. In the third and fourth stages(sedimentary period of Feng2 section),calcium and magne⁃ sium carbonate deposits,as well as sodium carbonate deposits were salinized and alkalized under the influence of hydrothermal action. In the fifth stage(sedimentary period of Feng3 section),tuffaceous mudstone and terrig⁃ enous clastic rock were deposited under the condition of volcanic activities and damp climate,while the desalina⁃ tion took the role of primary reaction. Accordingly,the water depth of the lake basin developed in Mahu Sag changed periodically and became gradually shallower in general. The corresponding paleo-salinity evolution char⁃ acteristics of lake water were light-semi-saline-saline-semi-saline-light,while the paleoclimate evolution fea⁃ tures are semi-arid-humid-semi-arid-arid-semi-arid,but the semi-arid-arid climate performed generally. The grain size and sedimentary tectonic changes of clastic rocks in Fengcheng Formation can be used as an appropri⁃ ate environmental index,while the deposition of Fengcheng Formation was controlled by volcanic activities and paleoclimate,as the preservation of organic matter was closely related to paleo-bathymetric and redox preserva⁃ tion conditions of water body. The arid climate results in a large amount of evaporation of water,promoting sali⁃ nization,while hydrothermal action provides a general series of nutrients,and promotion of the alkaline lake.
- Publication
Natural Gas Geoscience, 2022, Vol 33, Issue 5, p677
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2022.01.009