石油实验地质2012，Vol.34Issue(1)：71-77,7.
鄂尔多斯盆地东部上古生界不同含气组合天然气地球化学特征
Geochemical characteristics of natural gas of different gas-bearing assemblages in Upper Paleozoic, eastern Ordos Basin
摘要
Abstract
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. The He8 gas pools of the middle gas-bearing assemblages mainly contain wet gas characterized by 2 peaks for dryness (0.93-0.94, 0.98-0.99) as well as high C2* alkanes content and low non-hydrocarbon content. The Qian5 gas pools of the upper gas-bearing assemblages are characterized by the highest methane content, relatively lower C2 Alkanes content, the lowest non-hydrocarbon content and the dryness ranges from 0. 96 to 0. 99. Carbon isotope values of methane are heavy among different gas-bearing assemblages and those of ethane and propane are in accordance with typical coal gas. 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.关键词
天然气/碳同位素/气源对比/上古生界/鄂尔多斯盆地Key words
natural gas/ carbon isotope/ correlation of gas and source rock/ Upper Paleozoic/ Ordos Basin分类
能源科技引用本文复制引用
李艳雷,赵靖舟,刘新社,席胜利,魏新善..鄂尔多斯盆地东部上古生界不同含气组合天然气地球化学特征[J].石油实验地质,2012,34(1):71-77,7.基金项目
陕西省自然科学基金项目(2007D05). （2007D05）
