大民屯凹陷东部陡坡带构造演化特征
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摘要
本文借助三维叠前时间偏移连片地震资料,系统地分析了大民屯凹陷地质结构及其形成演化。通过分析可得出以下新的认识:①始新世至渐新世为典型的东断西超伸展型箕状断陷,东部形成陡坡带,西部为斜坡,沉积、沉降中心位于荣胜堡洼陷;②东部陡坡带构造演化主要经历了伸展裂陷期、压扭走滑改造期、拗陷期及压性反转期四个阶段;③早期伸展断层被后期压扭断裂系改造后,形成多种构造样式,这些构造圈闭紧邻生油洼陷,具有优越的成藏条件,尤其是在原始伸展断面基础上形成的花状构造带、挤压背斜、逆冲断块、浅层反转构造,均具有良好的勘探前景。
By the aid of 3-D seismic piece-tied prestack time migration data,the paper systematically analyzed the geologic structure and its formation and evolution.The following knowledge can be resulted from above analysis:①typical expanded halfgraben characterized by fault in the east and onlap in the west has been formed from Eocene to Oligocene,where the eastern part is steep slope zone and western part is slope,and center of sedimentation or subsidence is in Rongshengpu depression;②the structural evolution in the eastern steep slope mainly has involved four stages,elongated fault-depressed stage,compresso-shear strike-slip reform stage,depression stage and compressive-overturned stage;③the elongated fault in the early age,after reformation of later compresso-shear fault system,formed various structural patterns and these structural traps are closely adjacent to oil-generating depression and have superior reservoir conditions,especially the flower structural belt,compressive anticline,thrust block and shallow overturned structure formed on the basis of original elongated fault plane have good exploration prospect.
By the aid of 3-D seismic piece-tied prestack time migration data,the paper systematically analyzed the geologic structure and its formation and evolution.The following knowledge can be resulted from above analysis:①typical expanded halfgraben characterized by fault in the east and onlap in the west has been formed from Eocene to Oligocene,where the eastern part is steep slope zone and western part is slope,and center of sedimentation or subsidence is in Rongshengpu depression;②the structural evolution in the eastern steep slope mainly has involved four stages,elongated fault-depressed stage,compresso-shear strike-slip reform stage,depression stage and compressive-overturned stage;③the elongated fault in the early age,after reformation of later compresso-shear fault system,formed various structural patterns and these structural traps are closely adjacent to oil-generating depression and have superior reservoir conditions,especially the flower structural belt,compressive anticline,thrust block and shallow overturned structure formed on the basis of original elongated fault plane have good exploration prospect.
引文
[1]黄竹安．大民屯凹陷油气藏分布规律与勘探方法．石油与天然气地质，1987，8(2)
[2]侯方辉等．济阳拗陷陡坡带构造特征——以东营凹陷北坡为例．海洋地质动态，2006，22(2)：6～8
[3]陈绍生等．大民屯凹陷安福屯潜山带裂缝形成和演化的动力学特征分析．石油勘探与开发，2003，30(4)：13～15
[4]姚继峰等．辽河盆地构造分析．断块油气田，1995，2(5)
[5]漆家福，陈发景．辽东湾—下辽河盆地新生代构造的运动学特征及其演化过程．现代地质，1994
[6]陈昭年，陈发景．反转构造与油气圈闭．地学前缘，1995
[7]王涛．中国东部裂谷盆地油气藏地质．北京：石油工业出版社，1997
[2]侯方辉等．济阳拗陷陡坡带构造特征——以东营凹陷北坡为例．海洋地质动态，2006，22(2)：6～8
[3]陈绍生等．大民屯凹陷安福屯潜山带裂缝形成和演化的动力学特征分析．石油勘探与开发，2003，30(4)：13～15
[4]姚继峰等．辽河盆地构造分析．断块油气田，1995，2(5)
[5]漆家福，陈发景．辽东湾—下辽河盆地新生代构造的运动学特征及其演化过程．现代地质，1994
[6]陈昭年，陈发景．反转构造与油气圈闭．地学前缘，1995
[7]王涛．中国东部裂谷盆地油气藏地质．北京：石油工业出版社，1997
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