中国地质2012，Vol.39Issue(2)：326-337,12.
准噶尔盆地四棵树凹陷烃源岩地球化学特征及其对车排子凸起油气聚集的贡献
Geochemical characteristics of source rocks and their contribution to petroleum accumulation of Chepaizi area in Sikeshu depression, Junggar Basin
摘要
Abstract
According to geochemical characteristics in combination with thermal evolution, there exist mainly three sets of source rocks in Sikeshu depression of Junggar basin, namely Jurassic (Badaowan Formation, Sangonghe Formation and Xishanyao Formation), Cretaceous and Paleogene. The Badaowan Formation source rocks which contain high abundance of organic matter of primarily Ⅲ and Ⅱ 2 type have fairly good hydrocarbon-generation potential. The Sangonghe Formation source rocks have poor condition of hydrocarbon generation in that they have low abundance of organic matter and inferior type of kerogen. The organic matter abundance in source rocks of Xishanyao Formation is relatively high, but its hydrocarbon-generation potential is not ideal owing to relatively small thickness and poorer type of organic matter. The Cretaceous source rocks in Sikeshu depression have maximum thickness of 300m, but the condition of hydrocarbon generation is not favarable due to the lower maturity. Paleogene source rocks with high abundance of organic matter and Type Ⅱ organic matter have poor hydrocarbon-generation potential because of lower maturity. Through oil-source rocks correlation and quantitative identification of mixed oil, it is concluded that the crude oil in Chepaizi area was mainly derived from the Jurassic source rock in Sikeshu depression and mixed with the immature crude oil from the Cretaceous source, but the hydrocarbon generation of the Paleogene source rock is very little due to no distribution of the source kitchen. It is inferred that coal-formed oil dissolved the biomarker-rich Cretaceous bitumen of relatively low thermal maturity, and overprinting occurred during oil migration.关键词
四棵树凹陷/烃源岩/地球化学特征/油源对比/侵染作用Key words
Sikeshu depression/ source rock/ geochemical characteristics/ oil-source correlation/ overprinting分类
天文与地球科学引用本文复制引用
张枝焕,向奎,秦黎明,庄文山,席伟军,赵双丰..准噶尔盆地四棵树凹陷烃源岩地球化学特征及其对车排子凸起油气聚集的贡献[J].中国地质,2012,39(2):326-337,12.基金项目
国家科技重大专项“准噶尔盆地及四川盆地碎屑岩领域油气富集规律与主控因素”(2011ZX05002-006)资助. （2011ZX05002-006）
