琼东南盆地岩石圈特征的构造模拟约束
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摘要
琼东南盆地是晚始新世时期发育于南海北缘的伸展性盆地。本文在利用盆地内区域2D地震资料构造解释的基础上,运用基于弹性梁模型和挠曲均衡原理的2D构造模拟软件对琼东南盆地岩石圈结构特征进行模拟。研究发现:琼东南盆地地区的有效弹性厚度在1～5km,最佳取值为3km;拉张因子在1.3～1.5,其中裂后阶段反演模拟的拉张因子为1.5,裂陷阶段正演模拟的拉张因子为1.3左右。最后对红河断裂新生代的活动以及南海扩张运动对模拟产生的可能影响进行了分析与讨论。
The Qiongdongnan basin is an extensional basin formed in Late-Eocene.In this study,based on the flexure isostasy principle and flexural cantilever model,we utilize 2D structurcal simulation software and calculate the effective elastic thickness valuse(Te)and the extensional factors on 2D interpreted seismic profiles.The results show that the effective elastic thicknesses vary in the range of 1-5 km,and their optimum value is 3 km.The extensional factors change between 1.3 and 1.5,about 1.5 for the post-rift period with forward modeling,and about 1.3 for the syn-rift period with inverse modeling.Finally,we discuss the possible influential factors of the activity of the Red River fault in the Cenozoic and the South China Sea spreading.
The Qiongdongnan basin is an extensional basin formed in Late-Eocene.In this study,based on the flexure isostasy principle and flexural cantilever model,we utilize 2D structurcal simulation software and calculate the effective elastic thickness valuse(Te)and the extensional factors on 2D interpreted seismic profiles.The results show that the effective elastic thicknesses vary in the range of 1-5 km,and their optimum value is 3 km.The extensional factors change between 1.3 and 1.5,about 1.5 for the post-rift period with forward modeling,and about 1.3 for the syn-rift period with inverse modeling.Finally,we discuss the possible influential factors of the activity of the Red River fault in the Cenozoic and the South China Sea spreading.
引文
①资料来自无锡石油地质研究所内部报告.
Clift P D and Lin J.2001.Preferential mantle lithospheric extension under the South China margin[J].Marine and Petroleum Geology,18:929-945.
Ding Weiwei,Li Mingbi,He Ming,et al.2009.Cenozoic tecono-sedimentary evolution in the middle part of northern continental shelf-slope region,South China Sea[J].Geological Journal of China Universities,15(3):339-350.(in Chinese with English abstract)
Fu Y ongtao,Fan Shouzhi and Shi Xiaobin.2005.Geological interpretation of the lithosphere effective elastic thickness[J].Chinese Journal of Geology,40(4):585-593.(in Chinese with English abstract)
Gong Zaisheng,Li Sitian,Xie Taijun,et al.1997.Basin Analysis and Hydrocarbon Accumulation in the Continental Margin,South China Sea[M].Beijing:Science Press:89-92.(in Chinese)
Haq B U,Hardenbol J and Vail P R.1987.Chronology of fluctuating sea level since the Triassic(250million years to present)[J].Science,25:1156-1167.
Hartl y R,Watts A B and Fairhead J D.1996.Isostasy of Africa[J].Earth and Planetary Science Letters,137:1-18.
Jin Yu and Jiang Xiaodian.2002.Lithopshere Dynamics[M].Beijing:Science Press:18(26):113-l29.(in Chinese)
Kuszn ir N J and Ziegler P A.1992.The mechanics of continental extension and sedimentary basin formation:A simple-shear/pure-shear flexural cantilever model[J].Tectonophysics,215:117-131.
Kuszni r N J,Marsden G and Egan S S.1991.A flexural cantilever simple shear/pure shear model of continental extension[J].Geological Society,London:Special Publication,56:41-61.
Lin A T and Watts A B.2002.Origin of the West Taiwan basin by orogenic loading and flexure of a rifted continental margin[J].Geophys.,107(9):2185.
McKe nzie D P.1978.Some remarks on the development of sedimentary basins[J].Earth and Planetary Science Letters,40:25-32.
Nadin P A and Kusznir N J.1995.Palaeocene uplift and Eocene subsidence in the northern North Sea Basin from2D forward and reverse stratigraphic modeling[J].Journal of Geological Society,152:833-848.
Rober ts A M and Yielding G.1991.Deformation around basin-margin faults in the North Sea/Norwegian rift[J].Geological Society,London,Special Publication,56:61-78.
Rober ts A M,Yielding G,Kusznir N J,et al.1995.Quantitative analysis of Triassic extension in the Northern Viking Graben[J].Journal of Geological Society,152:15-26.
Rober ts A M,Yielding G,Kusznir N J,et al.1993.Mesozoic extension in the North Sea:constraints from flexural backstripping,forward modelling and fault populations[A].Petroleum Geology of Northwest Europe,Proceedings of the Fourth Conference:London:Geological Society of London:1123-1136.
Shi X iaobing,Zhou Di and Zhang Jiaxiang.2000.The thermo-rheological structure of lithosphere in the north of South China Sea[J].Chinese Science Bulletin,45(15):1660-1665.(in Chinese with English abstract)
Stew art J and Watts A B.1997.Gravity anomalies and spatial variations of flexural rigidity at mountain ranges[J].Geophys.Res.,102(B3):5327-5352.
Tong Dianjun,Ren Jianye,Lei Chao,et al.2009.Lithosphere stretching model of deep water in Qiongdongnan basin,northern continental margin of South China Sea,and controlling of the post-rift subsidence[J].Acta Geoscientia Sinica,34(6):963-974.(in Chinese with English abstract)
Watt s A B.2001.Isostasy and Flexure of the Lithosphere[M].London:Cambridge University Press:2-9,285-383.
West away.1994.Reevaluation of extension across the Pearl River mouth basin,South China Sea—implications for continental lithosphere deformation mechanisms[J].Journal of Structural Geology,16(6):823-838.
Xie Xinong,Muller R D,Li Sitian,et al.2006.Origin of anomalous subsidence along the northern South China Sea margin and its relationship to dynamic topography[J].Marine and Petroleum Geology,23:745-765.
Xie Wenyan,Zhang Yiwei,Sun Zhen,et al.2008.The mechanism research of the formation of the Qiongdongnan basin during the Cenozoic through modeling experiments[J].Earth Science Frontiers,15(2):232-241.
Yuan Bingqiang,Poudjom Y H,Wang Ping,et a1.2002.Effective lithospheric elastic thickness of southeastern part of Arctic Ocean-Eurasia Continent-Pacific Ocean geoscience transect[J]Earth Science—Journal of China University of Geosciences,27(4):397-402.(in Chinese with English abstract)
Yieldin g G,Badley M E and Freeman B.1991.Seismic reflections from normal faults in the northern North Sea[J].Geological Society,London,Special Publications,51:79-89.
Yieldi ng G,Badley M E and Roberts A M.1992.The structural evolution of the Brent Province[J].Geological Society,London,Special Publications,61:27-43.
Zhan g Yunfan,Sun Zhen,Zhou Di,et al.2007.Stretching characteristics and its dynamic significance of the northern continental margin of South China Sea[J].Science in China(Series D),37(12):1609-1616.(in Chinese with English abstract)
丁巍伟,黎明碧,何敏,等.2009.南海中北部陆架—陆坡区新生代构造—沉积演化[J].高校地质学报,15(3):339-350.
付永涛,范守志,施小斌.2005.关于岩石圈有效弹性厚度的地质理解[J].地质科学,40(4):585-593.
龚再升,李思田,谢泰俊,等.1997.南海北部大陆边缘盆地分析与油气聚集[M].北京:科学出版社:89-92.
金煜和姜效典.2002.岩石圈动力学[M].北京:科学出版社:113-l29.
施小斌,周蒂,张毅祥.2000.南海北部陆缘岩石圈热-流变结构[J].科学通报,45(15):1660-1665.
佟殿君,任建业,雷超,等.2009.琼东南盆地深水区岩石圈伸展模式及其对裂后期沉降的控制[J].地球科学——中国地质大学学报,34(6):963-974.
谢文彦,张一伟,孙珍,等.2008.琼东南盆地新生代发育机制的模拟研究[J].地学前缘,15(2):232-241.
袁炳强,Poudjom Y H,王平,等.2002.北冰洋—欧亚大陆—太平洋地学断面东南段岩石圈有效弹性厚度[J].地球科学——中国地质大学学报,27(4):397-402.
张云帆,孙珍,周蒂,等.2007.南海北部陆缘新生代地壳减薄特征及其动力学意义[J].中国科学(D辑):37(12):1609-1616.
Clift P D and Lin J.2001.Preferential mantle lithospheric extension under the South China margin[J].Marine and Petroleum Geology,18:929-945.
Ding Weiwei,Li Mingbi,He Ming,et al.2009.Cenozoic tecono-sedimentary evolution in the middle part of northern continental shelf-slope region,South China Sea[J].Geological Journal of China Universities,15(3):339-350.(in Chinese with English abstract)
Fu Y ongtao,Fan Shouzhi and Shi Xiaobin.2005.Geological interpretation of the lithosphere effective elastic thickness[J].Chinese Journal of Geology,40(4):585-593.(in Chinese with English abstract)
Gong Zaisheng,Li Sitian,Xie Taijun,et al.1997.Basin Analysis and Hydrocarbon Accumulation in the Continental Margin,South China Sea[M].Beijing:Science Press:89-92.(in Chinese)
Haq B U,Hardenbol J and Vail P R.1987.Chronology of fluctuating sea level since the Triassic(250million years to present)[J].Science,25:1156-1167.
Hartl y R,Watts A B and Fairhead J D.1996.Isostasy of Africa[J].Earth and Planetary Science Letters,137:1-18.
Jin Yu and Jiang Xiaodian.2002.Lithopshere Dynamics[M].Beijing:Science Press:18(26):113-l29.(in Chinese)
Kuszn ir N J and Ziegler P A.1992.The mechanics of continental extension and sedimentary basin formation:A simple-shear/pure-shear flexural cantilever model[J].Tectonophysics,215:117-131.
Kuszni r N J,Marsden G and Egan S S.1991.A flexural cantilever simple shear/pure shear model of continental extension[J].Geological Society,London:Special Publication,56:41-61.
Lin A T and Watts A B.2002.Origin of the West Taiwan basin by orogenic loading and flexure of a rifted continental margin[J].Geophys.,107(9):2185.
McKe nzie D P.1978.Some remarks on the development of sedimentary basins[J].Earth and Planetary Science Letters,40:25-32.
Nadin P A and Kusznir N J.1995.Palaeocene uplift and Eocene subsidence in the northern North Sea Basin from2D forward and reverse stratigraphic modeling[J].Journal of Geological Society,152:833-848.
Rober ts A M and Yielding G.1991.Deformation around basin-margin faults in the North Sea/Norwegian rift[J].Geological Society,London,Special Publication,56:61-78.
Rober ts A M,Yielding G,Kusznir N J,et al.1995.Quantitative analysis of Triassic extension in the Northern Viking Graben[J].Journal of Geological Society,152:15-26.
Rober ts A M,Yielding G,Kusznir N J,et al.1993.Mesozoic extension in the North Sea:constraints from flexural backstripping,forward modelling and fault populations[A].Petroleum Geology of Northwest Europe,Proceedings of the Fourth Conference:London:Geological Society of London:1123-1136.
Shi X iaobing,Zhou Di and Zhang Jiaxiang.2000.The thermo-rheological structure of lithosphere in the north of South China Sea[J].Chinese Science Bulletin,45(15):1660-1665.(in Chinese with English abstract)
Stew art J and Watts A B.1997.Gravity anomalies and spatial variations of flexural rigidity at mountain ranges[J].Geophys.Res.,102(B3):5327-5352.
Tong Dianjun,Ren Jianye,Lei Chao,et al.2009.Lithosphere stretching model of deep water in Qiongdongnan basin,northern continental margin of South China Sea,and controlling of the post-rift subsidence[J].Acta Geoscientia Sinica,34(6):963-974.(in Chinese with English abstract)
Watt s A B.2001.Isostasy and Flexure of the Lithosphere[M].London:Cambridge University Press:2-9,285-383.
West away.1994.Reevaluation of extension across the Pearl River mouth basin,South China Sea—implications for continental lithosphere deformation mechanisms[J].Journal of Structural Geology,16(6):823-838.
Xie Xinong,Muller R D,Li Sitian,et al.2006.Origin of anomalous subsidence along the northern South China Sea margin and its relationship to dynamic topography[J].Marine and Petroleum Geology,23:745-765.
Xie Wenyan,Zhang Yiwei,Sun Zhen,et al.2008.The mechanism research of the formation of the Qiongdongnan basin during the Cenozoic through modeling experiments[J].Earth Science Frontiers,15(2):232-241.
Yuan Bingqiang,Poudjom Y H,Wang Ping,et a1.2002.Effective lithospheric elastic thickness of southeastern part of Arctic Ocean-Eurasia Continent-Pacific Ocean geoscience transect[J]Earth Science—Journal of China University of Geosciences,27(4):397-402.(in Chinese with English abstract)
Yieldin g G,Badley M E and Freeman B.1991.Seismic reflections from normal faults in the northern North Sea[J].Geological Society,London,Special Publications,51:79-89.
Yieldi ng G,Badley M E and Roberts A M.1992.The structural evolution of the Brent Province[J].Geological Society,London,Special Publications,61:27-43.
Zhan g Yunfan,Sun Zhen,Zhou Di,et al.2007.Stretching characteristics and its dynamic significance of the northern continental margin of South China Sea[J].Science in China(Series D),37(12):1609-1616.(in Chinese with English abstract)
丁巍伟,黎明碧,何敏,等.2009.南海中北部陆架—陆坡区新生代构造—沉积演化[J].高校地质学报,15(3):339-350.
付永涛,范守志,施小斌.2005.关于岩石圈有效弹性厚度的地质理解[J].地质科学,40(4):585-593.
龚再升,李思田,谢泰俊,等.1997.南海北部大陆边缘盆地分析与油气聚集[M].北京:科学出版社:89-92.
金煜和姜效典.2002.岩石圈动力学[M].北京:科学出版社:113-l29.
施小斌,周蒂,张毅祥.2000.南海北部陆缘岩石圈热-流变结构[J].科学通报,45(15):1660-1665.
佟殿君,任建业,雷超,等.2009.琼东南盆地深水区岩石圈伸展模式及其对裂后期沉降的控制[J].地球科学——中国地质大学学报,34(6):963-974.
谢文彦,张一伟,孙珍,等.2008.琼东南盆地新生代发育机制的模拟研究[J].地学前缘,15(2):232-241.
袁炳强,Poudjom Y H,王平,等.2002.北冰洋—欧亚大陆—太平洋地学断面东南段岩石圈有效弹性厚度[J].地球科学——中国地质大学学报,27(4):397-402.
张云帆,孙珍,周蒂,等.2007.南海北部陆缘新生代地壳减薄特征及其动力学意义[J].中国科学(D辑):37(12):1609-1616.
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