科研之友
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摘要
The mudstone developed in Middle and Upper Permian in the southern Jimsar area of the Junggar Basin is thick and widely distributed, with high organic matter content and rich oil and gas resources. In this study, we carried out biomarker and elemental geochemical analysis on mudstone samples from the Middle Permian Lucaogou Formation and Upper Permian Wutonggou Formation in the southern Jimsar area. On this basis, we studied the redox conditions, paleo-salinity and paleoclimate characteristics of the Middle Permian Lucaogou Formation and Upper Permian Wutonggou Formation mudstone in the southern Jimsar area. The results show that: (1) The Middle Permian Lucaogou Formation was in a weak reducing environment, the sources of organic matter are mainly lower aquatic organisms, submerged plants, and prokaryotes. The middle section of the Lucaogou Formation may be mixed with a small amount of higher plants. The Upper Permian Wutonggou Formation was in a weak oxidation and weak reducing environment, the sources of organic matter are mainly lower aquatic organisms, submerged plants, and prokaryotes, possibly mixed with a small amount of higher plants. Compared with Lucaogou Formation, Wutonggou Formation seems to have more submerged plants, sphagnum, and prokaryotes. (2) During the depositional period of the Middle Permian Lucaogou Formation, it was a saline-brackish water environment, which was dominated by dry and hot paleoclimate conditions. However, during the depositional period of the Wutonggou Formation in the Upper Permian, it was a weak salinity-fresh water environment, which was dominated by warm and humid paleoclimate conditions. (3) From the Middle Permian to the Late Permian, the salinity of lake basin in the study area decreased, the paleoclimate changed from dry and hot to warm and humid. The sources of organic matter are mainly lower aquatic organisms, submerged plants, and prokaryotes.
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