• 责任者：Xiao Qilin (State Key Laboratory of Organic Geochemistry ; Guangzhou Institute of Geochemistry ; Chinese Academy of Sciences ; Guangzhou 510640 ; China) ; Sun Yongge
• 刊名：Acta Petrolei Sinica
• 出版年：2011
• 卷期：32(2)
• 关键词：原油 ; crude oil ; 油藏地球化学 ; reservoir geochemistry ; 轻烃 ; light hydrocarbon ; 新疆 ; Xinjiang
• 页码：p.206-211
• 图表：5 illus, 2 tables, 21 refs.
• 分类号：1003
• 出版序号：20120331
• issnNo：ISSN0253-2697
• isbnNo：CN11-2128/TE

The influences of thermal alteration, evaporation fractionation and water washing on the Carboniferous oils were evaluated by using chemical and isotopic compositions of light hydrocarbons (C₆—C₈) in Carboniferous crude oils from the Tz4 Oilfield,  NW China. The results suggest that hydrocarbons in the CI Fm and CII and CIII Fms have distinct accumulation processes. Oil cracking probably occurred in the deeply-buried Lower Ordovician and Cambrian paleo-reservoirs through geological time scale, these thermally altered oils migrated upward along faults and finally accumulated in the Carboniferous. Natural gases from hydrocarbon secondary cracking should have a critical implication in forming gas accumulations in this region recently.