四川盆地乐山-龙女寺古隆起震旦系天然气成藏史
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摘要
应用天然气生成和同位素分馏的化学动力学方法对四川盆地乐山-龙女寺古隆起震旦系天然气成藏史进行研究。结果表明:1高石梯-磨溪含气构造为继承性隆起,有利于天然气的高效聚集,震旦系灯影组主要聚集191 Ma以来所生天然气,早期所生天然气未运聚成藏或散失,成藏参与率约为79%;2资阳构造圈闭受燕山期构造运动影响逐渐演化成威远构造的斜坡,构造运动调整过程中剩余未裂解原油运移至新的构造高部位——威远构造继续裂解,资阳和威远气田分别聚集构造调整前后(106~104 Ma)所生天然气;3威远气田构造圈闭由于形成较晚,捕捉到的原油裂解气有限,成藏参与率约为51%,低于高石梯-磨溪地区;4资阳-威远地区构造反转过程中资阳古隆起中天然气会大量散失,尽管高石梯-磨溪地区天然气生成结束的时间早于资阳-威远地区90 Ma,不利于保存,但其气藏充满度却高于资阳-威远地区。
History of natural gas accumulation in Leshan-Longnyusi Sinian paleo-uplift in the Sichuan Basin was studied with chemical kinetic methods of gas generation and isotopic fractionation. The results show that: 1 Gaoshiti-Moxi gas bearing structure is an inherited uplift which is conducive to efficient accumulation of natural gas. The natural gas generated since 191 Ma mainly gathered in the Sinian Dengying Formation,while that generated earlier didn 't accumulate or dissipated after accumulation. The gas accumulation participation rate is about 79%. 2 The Ziyang structural trap gradually evolved into a tectonic slope of Weiyuan trap during the Yanshan tectonic movement. The remaining nonpyrolysed crude oil migrated to the new structural high—Weiyuan trap and continued to pyrolyse there during the tectonic movement. So Ziyang and Weiyuan gas fields gather the natural gas generated before and after structural adjustment( 106- 104 Ma),respectively. 3Weiyuan structural trap captured limited pyrolysis gas due to its late formation,and its gas accumulation participation rate is about 51%,which is lower than that in Gaoshiti-Moxi area. 4Much natural gas in Ziyang paleo-uplift was lost during Ziyang-Weiyuan tectonic inversion. Although the ending of gas generation in GaoshitiMoxi area is 90 Ma earlier than that in Ziyang-Weiyuan area,which is not conducive to the preservation,its gas reservoir fullness is higher than the later area.
History of natural gas accumulation in Leshan-Longnyusi Sinian paleo-uplift in the Sichuan Basin was studied with chemical kinetic methods of gas generation and isotopic fractionation. The results show that: 1 Gaoshiti-Moxi gas bearing structure is an inherited uplift which is conducive to efficient accumulation of natural gas. The natural gas generated since 191 Ma mainly gathered in the Sinian Dengying Formation,while that generated earlier didn 't accumulate or dissipated after accumulation. The gas accumulation participation rate is about 79%. 2 The Ziyang structural trap gradually evolved into a tectonic slope of Weiyuan trap during the Yanshan tectonic movement. The remaining nonpyrolysed crude oil migrated to the new structural high—Weiyuan trap and continued to pyrolyse there during the tectonic movement. So Ziyang and Weiyuan gas fields gather the natural gas generated before and after structural adjustment( 106- 104 Ma),respectively. 3Weiyuan structural trap captured limited pyrolysis gas due to its late formation,and its gas accumulation participation rate is about 51%,which is lower than that in Gaoshiti-Moxi area. 4Much natural gas in Ziyang paleo-uplift was lost during Ziyang-Weiyuan tectonic inversion. Although the ending of gas generation in GaoshitiMoxi area is 90 Ma earlier than that in Ziyang-Weiyuan area,which is not conducive to the preservation,its gas reservoir fullness is higher than the later area.
引文
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[2]韩克猷,孙玮.四川盆地海相大气田和气田群成藏条件[J].石油与天然气地质,2014,35(1):10-18.Han Keyou,Sun Wei.Conditions for the formation of large marine gas fields and gas field clusters in Sichuan Basin[J].Oil&Gas Geology,2014,35(1):10-18.
[3]郭彤楼.四川盆地奥陶系储层发育特征与勘探潜力[J].石油与天然气地质,2014,35(3):372-378.Guo Tonglou.Charateristics and exploration potential of Ordovician reservoirs in Sichuan Basin[J].Oil&Gas Geology,2014,35(3):372-378.
[4]王庭斌,董立,张亚雄.中国与煤成气相关的大型、特大型气田分布特征及启示[J].石油与天然气地质,2014,35(2):167-182.Wang Tingbin,Dong Li,Zhang Yaxiong.Distribution of large and giant coal-related gas fields in China and its significance[J].Oil&Gas Geology,2014,35(2):167-182.
[5]张林,魏国齐,汪泽成,等.四川盆地高石梯-磨溪构造带震旦系灯影组的成藏模式[J].天然气地球科学,2004,15(6):584-589.Zhang Lin,Wei Guoqi,Wang Zecheng,et al.Analysis of formation mechanism of Sinian Dengying formation in Gaoshiti-Moxi structure belt in Sichuan Basin[J].Natural Gas Geoscience,2004,15(6):584-589.
[6]杨家静.四川盆地乐山-龙女寺古隆起震旦系油气藏形成演化研究[D].成都:西南石油学院,2002.Yang Jiajing.Study on formation and evolution of Sinian petroleum pools in Leshan-Longnusi Paleo-uplift,Sichuan Basin[D].Chengdu:Southwest Petroleum University,2002.
[7]许海龙,魏国齐,贾承造,等.乐山-龙女寺古隆起构造演化及对震旦系成藏的控制[J].石油勘探与开发,2012,39(4):406-16.Xu Hailong,Wei Guoqi,Jia Chengzao,et al.Tectonic evolution of the Leshan-Longnusi paleo-uplift and its control on gas accumulation in the Sinian strata,Sichuan Basin[J].Petroleum Exploration and Development,2012,39(4):406-416.
[8]徐世琦,洪海涛,师晓蓉.乐山-龙女寺古隆起与下古生界含油气性的关系探讨[J].天然气勘探与开发,2002,25(3):10-15.Xu Shiqi,Hong haitao,Shi Xiaorong.Relationship analysis of the Leshan-Longnusi paleo-uplift and petroleum potential of Lower Paleozoic[J].Natural Gas Exploration and Development,2002,25(3):10-15.
[9]戴金星.威远气田成藏期及气源[J].石油实验地质,2003,25(5):473-480.Dai Jinxing.Pool-forming periods and gas sources of Weiyuan gasfield[J].Petroleum Geology and Experiment,2003,25(5):473-480.
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[12]张水昌,朱光有.四川盆地海相天然气富集成藏特征与勘探潜力[J].石油学报,2006,27(5):1-8.Zhang Shuichang,Zhu Guangyou.Gas accumulation characteristics and exploration potential of marine sediments in Sichuan Basin[J].Acta Petrolei Sinica,2006,27(5):1-8.
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[15]杨家静,王一刚,王兰生,等.四川盆地东部长兴组-飞仙关组气藏地球化学特征及气源探讨[J].沉积学报,2002,20(2):349-352.Yang Jiajing,Wang Yigang,Wang Lansheng,et al.The origin of natural gases and geochemistry characters of Changxing reef and Feixianguan oolitic beach gas reservoirs in eastern Sichuan Basin[J].Acta Sedimentologica Sinaca,2002,20(2):349-352.
[16]朱光有,张水昌,梁英波,等.四川盆地天然气特征及气源[J].地学前缘,2006,13(2):234-248.Zhu Guangyou,Zhang Shuichang,Liang Yingbo,et al.The characteristics of natural gas in Sichuan basin and its sources[J].Earth Science Frontiers,2006,13(2):234-248.
[17]卢双舫.有机质成烃动力学理论及其应用[M].北京:石油工业出版社,1996.Lu Shuangfang.The theory of organic matter hydrocarbon generation kinetics and its application[M].Beijing:Petroleum Industry Press,1996.
[18]卢双舫,李吉君,薛海涛,等.碳同位素分馏模型比较研究[J].天然气工业,2006,26(7):1-4.Lu Shuangfang,Li Jijun,Xue Haitao,et al.Comparison of fractionation models of carbon isotope[J].Natural Gas Industry,2006,26(7):1-4.
[19]Stahl W J.Carbon and nitrogen isotopes in hydrocarbon research and exploration[J].Chemical Geology,1977,20:121-149.
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