鄂尔多斯盆地上古生界天然气成因新探索
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摘要
鄂尔多斯盆地上古生界天然气一直被认为是油型气和煤成气二源混合气。通过区域构造特征、盆地演化、地震活动和地球化学等分析 ,发现上古生界天然气藏沿深大断裂分布 ,具有生烃期与构造活动时间相吻合的特点 ,以及部分井天然气中CO2 、N2 、He含量非常高、甲烷同系物碳同位素发生反转、CO2 碳同位素和3 He/4He高异常等特征 ,从而认为上古生界天然气是油型气、煤成气和深源无机气三源混合而成。中生代晚期盆地深大断裂的强烈活动导致深源流体上涌并与古生界天然气发生混合 ,并且其中的H2 对烃源岩生烃起到加氢作用 ,促进了其生烃演化 ,扩大了天然气的丰度。
The Upper Paleozoic natural gas in E′erduosi Basin has been always regarded as a two-source mixed gas of the oil-formed gas and coal-formed gas.Through the investigation on regional tectonic features,basin evolution,seismic activity and geochemistry,etc,it was found that the Upper Paleozoic gas reservoirs in the basin are of these characteristics,such as the distribution along discordogenic faults,the identity of hydrocarbon generation period with structural activity time and the very high CO 2-,N 2- and He-content,CH 4 series carbon isotope reversion,high CO 2 carbon isotope and high3He/4He ratio in natural gas in partial wells,etc.For this reason,it is considered in the paper that the Upper Paleozoic natural gas is a three-source mixed gas of the oil-formed gas,coal-formed gas and deep-source inorganic gas.In Late Mesozoic,the strong activity of the discordogenic faults in the basin caused the deep fluids to be moved up and to be mixed with the Upper Paleozoic natural gas,and the hydrogen in the fluids had played a role of hydrogenizing in the hydrocarbon generation in source rocks,which could promote the evolution of source rocks and increase natural gas abundance.Such an idea is of great importance to probing the mechanism of gas genesis of the tectonic activity regions in E′erduosi Basin and to the natural gas exploration in the future.
The Upper Paleozoic natural gas in E′erduosi Basin has been always regarded as a two-source mixed gas of the oil-formed gas and coal-formed gas.Through the investigation on regional tectonic features,basin evolution,seismic activity and geochemistry,etc,it was found that the Upper Paleozoic gas reservoirs in the basin are of these characteristics,such as the distribution along discordogenic faults,the identity of hydrocarbon generation period with structural activity time and the very high CO 2-,N 2- and He-content,CH 4 series carbon isotope reversion,high CO 2 carbon isotope and high3He/4He ratio in natural gas in partial wells,etc.For this reason,it is considered in the paper that the Upper Paleozoic natural gas is a three-source mixed gas of the oil-formed gas,coal-formed gas and deep-source inorganic gas.In Late Mesozoic,the strong activity of the discordogenic faults in the basin caused the deep fluids to be moved up and to be mixed with the Upper Paleozoic natural gas,and the hydrogen in the fluids had played a role of hydrogenizing in the hydrocarbon generation in source rocks,which could promote the evolution of source rocks and increase natural gas abundance.Such an idea is of great importance to probing the mechanism of gas genesis of the tectonic activity regions in E′erduosi Basin and to the natural gas exploration in the future.
引文
克列晓夫,由洋底火山活动形成油气的可能性,地质科技动态,1997。
万从礼,东营凹陷火成岩与烃源岩相互作用及其组合体油气成藏模式研究,石油大学2002年博士学位论文。
张军等,鄂尔多斯盆地古生界含气系统研究,内部报告,1999。
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7 郭占谦,杨步增,李星军等.松辽盆地无机气藏模式.天然气工业,2000;6(20):30～33
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9 王涛.中国天然气地质理论基础与实践.北京:石油工业出版社,1997:77
10杨俊杰,裴锡古.中国天然气地质学.卷四,北京:石油工业出版社,1996:87
万从礼,东营凹陷火成岩与烃源岩相互作用及其组合体油气成藏模式研究,石油大学2002年博士学位论文。
张军等,鄂尔多斯盆地古生界含气系统研究,内部报告,1999。
1 杨俊杰.鄂尔多斯盆地构造演化与油气分布规律.北京:石油工业出版社,2002:48
2 欧阳自远,倪集众,项仁杰.地球化学:历史、现状和发展趋势.北京:原子能出版社,1996:70
3 汤锡元,郭忠铭,陈荷立等.陕甘宁盆地西缘推覆构造及油气勘探.西安:西北大学出版社,1992:2
4 中华人民共和国区域地质调查报告(银川市幅).1983:82
5 中华人民共和国区域地质调查报告(石嘴山市幅).1982:141
6 邸领军,张东阳,王宏科.鄂尔多斯盆地喜山期构造运动与油气成藏.石油学报,2003;2(24):34～37
7 郭占谦,杨步增,李星军等.松辽盆地无机气藏模式.天然气工业,2000;6(20):30～33
8 戴金星,裴锡古,戚厚发.中国天然气地质学.卷二,北京:石油工业出版社,1996:189
9 王涛.中国天然气地质理论基础与实践.北京:石油工业出版社,1997:77
10杨俊杰,裴锡古.中国天然气地质学.卷四,北京:石油工业出版社,1996:87
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