沾化凹陷东北部中新生代盆地演化过程研究
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摘要
依据层长守恒原则对沾化凹陷东北部北东和北西向,各3条连井地震剖面进行了平衡剖面恢复,并分析了各剖面在地质历史时期内伸展率的变化特征,以了解该地区中、新生代盆地发育演化特征。沾化凹陷东北部中、新生代盆地演化可以划分为如下几个主要阶段:早—中三叠世为大型内陆坳陷发育阶段,地层横向沉积稳定;晚三叠世本区整体挤压抬升剥蚀,并开始发育北西向逆冲断层;早—中侏罗世为对前期地势高差起伏填平补齐的均夷化过程,地层沉积具充填-披覆式特征;晚侏罗世—白垩纪原北西向逆冲断层负向反转,转为张性伸展,本区进入断陷盆地发育阶段,局部发育有挤压逆冲构造;古近纪本区仍为断陷盆地发育阶段,除北西向断层继承性活动外,大量北东(东)向正断层开始活动;新近纪本区进入区域性坳陷沉降阶段。
To find out the evolutionary characteristics of Mesozoic and Cenozoic basins in northeastern Zhanhua sag,the balancing cross sections of three NW-trending and three NE-trending connecting-well seismic sections were reconstructed, according to the principle that stratum length is conservative.And the variation of extensional proportion in geological periods of each section was analyzed. The basin evolution stages from Mesozoic to Cenozoic in the northeastern Zhanhua sag can be divided into some stages,including the period of early to middle Triassic,a large inland depression developed;in late Triassic the study area was uplifted wholly and denuded,and NW-trending thrusting faults began to develop;during early to middle Jurassic there was a 'filling-up' process on the undulate topography formed in advance;in the period of Jurassic to Cretaceous former NW-trending faults inversed negatively and transferred to extend,the stage of rift basin began,meanwhile in some areas,stretching and thrusting structures grew;the rift basin continued developing during Paleogene,the NW-trending faults went successive action,and many NE(E)-trending faults also began acting during this stage;in Neogene the study area began to regional subsidence as a depression.
To find out the evolutionary characteristics of Mesozoic and Cenozoic basins in northeastern Zhanhua sag,the balancing cross sections of three NW-trending and three NE-trending connecting-well seismic sections were reconstructed, according to the principle that stratum length is conservative.And the variation of extensional proportion in geological periods of each section was analyzed. The basin evolution stages from Mesozoic to Cenozoic in the northeastern Zhanhua sag can be divided into some stages,including the period of early to middle Triassic,a large inland depression developed;in late Triassic the study area was uplifted wholly and denuded,and NW-trending thrusting faults began to develop;during early to middle Jurassic there was a 'filling-up' process on the undulate topography formed in advance;in the period of Jurassic to Cretaceous former NW-trending faults inversed negatively and transferred to extend,the stage of rift basin began,meanwhile in some areas,stretching and thrusting structures grew;the rift basin continued developing during Paleogene,the NW-trending faults went successive action,and many NE(E)-trending faults also began acting during this stage;in Neogene the study area began to regional subsidence as a depression.
引文
[1]李增学,曹忠祥,王明镇,等.济阳坳陷石炭二叠系埋藏条件及煤型气源岩分布特征[J].煤田地质与勘探,2004,32(4):4-6.
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[8]马宝军,漆家福,王永诗,等.车镇凹陷车古201潜山形成过程的构造物理模拟[J].煤田地质与勘探,2005,33(3):1-4.
[9]徐嘉炜,马国锋.郯庐断裂带研究的十年回顾[J].地质论评,1992,18(4):316-324.
[10]陈发景,汪新文.中国中、新生代含油气盆地成因类型、构造体系及地球动力学模式[J].现代地质,1997,11(4):409-424.
[11]朱光,王道轩,刘国生,等.郯庐断裂带的伸展活动及其动力学背景[J].地质科学,2001,36(3):269-278.
[12]李鹏举,卢华复,施央申.渤海湾盆地东濮凹陷的形成及断裂构造研究[J].南京大学学报,1995,31(1):128-139.
[13]任建业,李思田.西太平洋边缘海盆地的扩张过程和动力学背景[J].地学前缘,2000,7(3):203-213.
[2]Dahlstrom C D A.Balanced cross sections[J].Canadian Joural ofEarth Science.1969,6:743-757.
[3]陈伟,卢华复,施央申.平衡剖面计算机模拟及其应用[M].北京:科学出版社,1993,62-78.
[4]漆家福,杨桥,王子煜,等.关于编制盆地构造演化剖面的几个问题的讨论[J].地质论平,2001,47(4):388-392.
[5]宋来亮,李鸿文,黄永玲,等.平衡剖面技术在伊朗Kashan地区的应用[J].油气地质与采收率,2003,10(增刊):3-5.
[6]吴智平,李伟,任拥军,等.济阳坳陷中生代盆地演化及其与新生代盆地叠合关系探讨[J].地质学报,2003,77(2):281-286.
[7]李伟,吴智平,周瑶琪.济阳坳陷中生代地层剥蚀厚度、原始厚度恢复及原型盆地研究[J].地质论评,2005,51(5):507-515.
[8]马宝军,漆家福,王永诗,等.车镇凹陷车古201潜山形成过程的构造物理模拟[J].煤田地质与勘探,2005,33(3):1-4.
[9]徐嘉炜,马国锋.郯庐断裂带研究的十年回顾[J].地质论评,1992,18(4):316-324.
[10]陈发景,汪新文.中国中、新生代含油气盆地成因类型、构造体系及地球动力学模式[J].现代地质,1997,11(4):409-424.
[11]朱光,王道轩,刘国生,等.郯庐断裂带的伸展活动及其动力学背景[J].地质科学,2001,36(3):269-278.
[12]李鹏举,卢华复,施央申.渤海湾盆地东濮凹陷的形成及断裂构造研究[J].南京大学学报,1995,31(1):128-139.
[13]任建业,李思田.西太平洋边缘海盆地的扩张过程和动力学背景[J].地学前缘,2000,7(3):203-213.
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