迈陈凹陷东部构造演化及其对构造样式的影响
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摘要
根据地震、钻井、测井资料,将迈陈凹陷新生界自下而上划分为长流组—流沙港组、涠洲组和新近系—第四系3个构造层,分别对应凹陷的陆相断陷、断拗过渡和海相拗陷3个构造演化阶段。这3个演化阶段之间的转变导致了凹陷构造格局的2次转变:始新世末期盆地构造格局由北东向转为近东西向;古近纪末期盆地整体抬升剥蚀,由断陷转变为区域拗陷。下部构造层区域应力以纯拉张为主,主要发育伸展构造样式;中部构造层区域应力场以拉张-走滑为主,主要发育伸展-走滑构造样式;上部构造层断裂发育较少或不发育。
Through the detailed analysis of seismic,drilling and well logging data,the Cenozoic of Maichen sag in Junggar basin can be divided into three structural zones from the bottom up: Changliu formation-Liushagang formation,Weizhou formation and Neogene-Quaternary.They correspond to such three structural evolution stages as continental rift stage,rift-depression transition stage and marine depression stage.The transition changes of the three stages result in two transformations of structural pattern of this sag: at the end of Eocene the Junggar basin's pattern transformed from NE to near EW;at the end of paleogene the whole basin was uplifted and eroded,becoming regional depression from rift.At the same time,the differences of structural evolution made the different structural styles developed in different structural zones: the stress in the lower structural zone(Changliu formation-Liushagang formation) was dominated by tension,developing stretch structural style;the stress in the middle structural zone(Weizhou formation) was tension and strike-slip,mainly developing stretch and strike-slip style,and in the upper structural zone(Neogene-Quaternary) few or no fault occurred.
Through the detailed analysis of seismic,drilling and well logging data,the Cenozoic of Maichen sag in Junggar basin can be divided into three structural zones from the bottom up: Changliu formation-Liushagang formation,Weizhou formation and Neogene-Quaternary.They correspond to such three structural evolution stages as continental rift stage,rift-depression transition stage and marine depression stage.The transition changes of the three stages result in two transformations of structural pattern of this sag: at the end of Eocene the Junggar basin's pattern transformed from NE to near EW;at the end of paleogene the whole basin was uplifted and eroded,becoming regional depression from rift.At the same time,the differences of structural evolution made the different structural styles developed in different structural zones: the stress in the lower structural zone(Changliu formation-Liushagang formation) was dominated by tension,developing stretch structural style;the stress in the middle structural zone(Weizhou formation) was tension and strike-slip,mainly developing stretch and strike-slip style,and in the upper structural zone(Neogene-Quaternary) few or no fault occurred.
引文
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[3]蔡周荣,刘维亮,万志峰,等.南海北部新生代构造运动厘定及与油气成藏关系探讨[J].海洋通报,2010,29(4):161-165.
[4]闫义,夏斌,林舸,等.南海北缘新生代盆地沉积与构造演化及地球动力学背景[J].海洋地质与第四纪地质,2005,25(2):53-60.
[5]汪伟光,吕修祥,喻莲,等.塔里木盆地构造枢纽带及其油气藏条件[J].新疆石油地质,2011,32(4):333-337.
[6]陈海云,于建国,舒良树,等.济阳坳陷构造样式及其与油气关系[J].高校地质学报,2005,11(4):622-632.
[7]林舸,王岳军,李自安.盆地基本构造样式与天然气成藏[J].大地构造域成矿学,1999,23(3):197-204.
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