• 责任者：Yang Xin (Key Laboratory of Petroleum Resources Research ; Institute of Geology and Geophysics ; Chinese Academy of Sciences ; Lanzhou 730000 ; China) ; Zheng Jianjing
• 刊名：Natural Gas Geoscience
• 出版年：2011
• 卷期：22(6)
• 关键词：天然气成因 ; natural gas origin ; 成藏模式 ; pool-formed model ; 辽河坳陷 ; Liaohe Depression
• 页码：p.1015-1020
• 图表：8 illus., 11 refs.
• 分类号：1003
• issnNo：ISSN1672-1926
• isbnNo：CN62-1177/TE

 Natural gas origin is classified by chemical and isotopic compositions of natural gas in the west sag of Liaohe depression. In this paper, the authors discuss the gas filling pattern by means of conditions of gas accumulation. The low-mature coal-type gas and oil-biodegraded gas are dominant in the west sag, such as Shuangtaizi area and Gaosheng as typical case. The primary gas pool of Shuangtaizi was formed since the Dongying Phase, and the coal type gas sourced from the middle-upper part mudstone in three member of Sha Formation was resolved from oil and accumulated in shallow strata series or migrated into gas trap along faults. The oil-biodegraded gas was formed before 24 Ma and accumulated at top of heavy oil layers by short distance migration in the Gaosheng area.