Well che89, located in the Chepaizi area in the northwest margin of Junggar basin, acquires high production industrial oil flow, which is an important breakthrough in the exploration of the south foreland slope area of Junggar basin. The Chepaizi area is near two hydrocarbon generation depressions of Sikeshu and Shawan, which have sets of hydrocarbon source rock of Carboniferous to Jurassic as well as Upper Tertiary. Geological and geochemical parameters are proper for the accumulation of mixed source crude oil. Carbon isotope, group composition and biomarkers of crude oil in Upper Tertiary of well Che89 show that the features of crude oil in Upper Tertiary Shawan Formation are between that of Permian and Jurassic, some of them are similar to these two, and some are of difference, they should be the mixed source of Permian and Jurassic. Geochemical analysis and geological study show that sand extract of Lower Tertiary Wulunguhe Formation has the same source as the crude oil and sand extract of Upper Tertiary Shawan Formation, but they are not charged in the same period. Oil/gas of Wulunguhe Formation is charged before Upper Tertiary sedimentation, and suffered serious biodegradation and oxidation and rinsing, which provide a proof in another aspect that the crude oil of Upper Tertiary Shawan Formation of well Che89 is not from hydrocarbon source rock of Lower Tertiary.
Well che89, located in the Chepaizi area in the northwest margin of Junggar basin, acquires high production industrial oil flow, which is an important breakthrough in the exploration of the south foreland slope area of Junggar basin. The Chepaizi area is near two hydrocarbon generation depressions of Sikeshu and Shawan, which have sets of hydrocarbon source rock of Carboniferous to Jurassic as well as Upper Tertiary. Geological and geochemical parameters are proper for the accumulation of mixed source crude oil. Carbon isotope, group composition and biomarkers of crude oil in Upper Tertiary of well Che89 show that the features of crude oil in Upper Tertiary Shawan Formation are between that of Permian and Jurassic, some of them are similar to these two, and some are of difference, they should be the mixed source of Permian and Jurassic. Geochemical analysis and geological study show that sand extract of Lower Tertiary Wulunguhe Formation has the same source as the crude oil and sand extract of Upper Tertiary Shawan Formation, but they are not charged in the same period. Oil/gas of Wulunguhe Formation is charged before Upper Tertiary sedimentation, and suffered serious biodegradation and oxidation and rinsing, which provide a proof in another aspect that the crude oil of Upper Tertiary Shawan Formation of well Che89 is not from hydrocarbon source rock of Lower Tertiary. 相似文献
金顶矿床是世界著名的超大型铅锌矿床,其巨量的金属堆积引起许多学者对成矿金属来源的关注。前人通过铅同位素示踪研究,提出了成矿金属来自地幔、上地壳、下地壳及不同端员混合等不同认识。理论分析表明,这些观点认识的差异可能源于不同作者分析铅同位素数据存在测试误差。基于此,笔者在金顶矿床选择了7个代表性硫化物样品,再次进行了铅同位素分析。结果显示,矿床铅同位素组成为~(206)Pb/~(204)Pb=18.3945~18.4429、~(207)Pb/~(204)Pb=15.6412~15.6583、~(208)Pb/~(204)Pb=38.6266~38.6772,在铅同位素演化模式图解(Zartman et al.,1979)中数据点分布集中,处于"造山带"和"上地壳"演化曲线之间,未显示出明显的线性分布特点,表明金顶矿床成矿金属来源主要为壳源;区域对比表明,金顶矿床明显比白秧坪矿带铅锌矿床贫放射性成因铅,而与区域VMS型矿床铅同位素组成更为接近,这表明金顶矿床与白秧坪矿带矿床有着不同的金属物源区,其金属可能来自盆地底部晚三叠世火山岩或其内早期的VMS矿化。 相似文献