收稿日期: 2012-06-18
修回日期: 2012-11-07
网络出版日期: 2013-02-10
基金资助
中国石油勘探开发研究院青年基金(编号:2010-A-26-05);中国石油勘探开发研究院院级项目(编号:2011Y-002)联合资助.
Geochemical Characteristics and Gas-source Correlation of Leikoupo Formation in Zhongba Field, Northwest Sichuan Basin
Received date: 2012-06-18
Revised date: 2012-11-07
Online published: 2013-02-10
中坝气田位于川西气区北部,主要产层为上三叠统须家河组二段和中三叠统雷口坡组三段,但其雷口坡组三段气藏的气源目前还没有定论。基于此,全面分析了中坝气田雷口坡组天然气组分和碳、氢同位素组成,并选取中坝气田须家河组煤成气、河湾场气田二叠系茅口组和长兴组以及三叠系飞仙关组油型气、川东北飞仙关组油型气与之进行对比。中坝气田雷口坡组天然气总体显示干气特征,干燥系数大都在0.97附近,H2S和CO2含量较高。中坝气田雷口坡组天然气中烷烃气碳、氢同位素组成与中坝须家河组、河湾场气田及川东北飞仙关组天然气的同位素组成都有明显差异,乙烷碳同位素组成较河湾场气田、川东北飞仙关组天然气重,而甲烷碳同位素组成较川东北飞仙关组天然气轻。甲烷氢同位素值在-140‰左右,比川东北飞仙关组油型气普遍低约20‰,而高于中坝须家河组煤成气约30‰。综合天然气组分,碳、氢同位素及轻烃和汞的特征分析认为中坝气田雷口坡组天然气以二叠系油型气为主,混有部分须家河组煤成气,且受TSR作用改造。
关键词: 中坝气田; 雷口坡组; ;天然气碳、氢同位素; 来源
廖凤蓉,吴小奇,黄士鹏,于聪 . 川西北地区中坝气田雷口坡组天然气地球化学特征及气源探讨[J]. 天然气地球科学, 2013 , 24(1) : 108 -115 . DOI: 10.11764/j.issn.1672-1926.2013.01.108
There are two main natural gas pay zones in the Zhongba gas field,that is,Member 2 of Xujiahe Formation,Upper Triassic (T3x2) and Member 3 of Leikoupo Formation,Middle Triassic (T2l3) in the northwest Sichuan basin.The gas source for T2l3 remains controversial.The paper analyzes the components as well as carbon and hydrogen isotopic composition characteristics of gases fromT2l3.To compare with the gases from the Leikoupo Formation,the paper also selects the gases from Member 2 of the Upper Triassic Xujiahe Formation in Zhongba gas field,the Permian Maokou Formation and the Changxing Formation as well as the Lower Triassic Feixianguan Formation in the Hewanchang gas field and the Feixianguan Formation in the northeastern Sichuan basin.Gases from the Leikoupo Formation display high gas dryness index around 0.97,high H2S and CO2 contents.Gases from the Leikoupo Formation and the Xujiahe Formation of the Zhongba field,the Hewanchang field and the Feixianguan Formation in the northeastern Sichuan basin display great differences in carbon and hydrogen isotopic composition characteristics.The ethane carbon isotopic values of the Leikoupo Formation are heavier than those of the Hewanchang gas field and the Feixianguan Formation in the northeastern Sichuan basin,but the methane carbon isotopic values are lighter than those of the Feixianguan Formation.The methane hydrogen isotope of the Leikoupo Formation are about -140‰,20‰ lower than those of the oil-associated gases of the Feixianguan Formation,but 30‰ greater than those of the coal-derived gases of the Xujiahe Formation.Comprehensive analysis about gas components,carbon and hydrogen isotopic composition characteristics,light hydrocarbon compositions,Mercury contentssuggested that gases from the Leikoupo Foramation of the Zhongba field are mainly Permian oil-associated gases mixed with a proportion of coal-derived gases from the Xujiahe Formation,and experienced thermochemical sulfate reduction transformation.
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