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阿尔金南坡干柴沟地区上干柴沟组新发现Podagonium-Quercus大古植物化石组合,该组合指示上干柴沟组中下部地层的时代为新近纪中新世,与我国华北板块、华南板块和青海乌兰、泽库等地区比较,显示出低分异度和低丰度的特点。从该植物组合相伴产出的Austrocypris分析,表明该地区纬向气候带属高温少雨、干湿交替的疏林草原环境,有利于柴西陆相成油盆地主力油源层的发育。
The Upper Paleozoic fossil assemblage of Podagonium-Quercus was newly discovered in Shangganchaigou Formation in Ganchaigou area, Altyn Slope of the southern margin of the Upper Cretaceous. The assemblage indicates that the Middle and Lower Cretaceous of Upper Ganchaigou Formation was Neogene in the age of Neogene, Qinghai Ulan, Zeku and other regions, showing the characteristics of low-grade and low abundance. The Austrocypris analysis accompanying the plant assemblage shows that the latitudinal climate in this area is characterized by high temperature and low rainfall, alternating dry-wet grassland environments, and is favorable for the development of the main source reservoir in the Chaixi oil and gas formation basin.