Geochemical Characteristics of Natural Gas of Different Gas-Bearing Assemblages in Upper Paleozoic, Eastern Ordos Basin
详细信息
- 责任者：Li Yanxia (Research Center of Unconventional Gas ; School of Oil-Gas Resources ; Petroleum University of Xi’an ; Xi’an 710065 ; China) ; Zhao Jinzhou
- 刊名：Petroleum Geology & Experiment
- 出版年：2012
- 卷期：34(1)
- 关键词：天然气 ; natural gas ; 碳同位素 ; carbon isotopes ; 鄂尔多斯盆地 ; Ordos Basin
- 页码：p.71-77
- 图表：5 illus., 1 table, 12 refs.
- 分类号：1003
- issnNo：ISSN1001-6112
- isbnNo：CN32-1151/TE
摘要
Based on gas molecular and stable carbon isotope analyses of 110 gas samples collected from the Upper Paleozoic in the eastern Ordos Basin,it has been concluded that the lower gas-bearing assemblages such as the Benxi,Taiyuan and Shanxi formations mainly contain dry gas characterized by high methane content,low C2+ alkanes content,high dryness and relatively high non-hydrocarbon content.Carbon isotopes of kerogen,desorption hydrocarbons of source rocks and cap rocks indicate that the source rocks have the characteristics of typical coal source rocks. Natural gas of different gas-bearing assemblages generates from underlying humic sources.