南宫凹陷边界断裂滑脱深度及意义
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摘要
根据冀南地区南宫凹陷构造发展演化历史特征,确定了南宫凹陷形成的动力学机制,即南宫凹陷是在裂陷动力学变形机制背景下形成的断陷盆地.特定的伸展构造背景决定了边界断裂滑脱深度的计算方法,由南宫凹陷边界断裂——明化镇断裂几何学和运动学特点,属典型的铲形正断层,结合I.Moretti关于铲形正断层控边盆地的滑脱深度和伸展量估算公式,估算出明化镇断裂的滑脱深度平均在8km以上,其数值与前人对华北地区深地震剖面所揭示的滑脱深度数据基本一致,从一个侧面反映了所取得数据的可靠性,这对该区油气勘探工作有一定的指导意义.
The dynamics mechanism of Nangong depression is ensured based on its structure developing evolution. Nangong depression is formed during paleogene rifting period, it belongs to fault depression basin.Caculating method of detachment depth is different according to vary extensional structure setting. Based on the characteristics of geometry and kinematics of Minghuazhen fault —boundary fault of Nangong depression,Minghuazhen fault is a kind of listric normal fault. Using the estimation formula of spading normal fault about detachment depth and extensional value advanced by I.Moretti, the detachment depth of Minghuazhen fault, about 8km, is consistent to the value that got from the deep seismic profile on the Huabei area. The reliable depth value has certain extent conference significance to petroleum exploration.
The dynamics mechanism of Nangong depression is ensured based on its structure developing evolution. Nangong depression is formed during paleogene rifting period, it belongs to fault depression basin.Caculating method of detachment depth is different according to vary extensional structure setting. Based on the characteristics of geometry and kinematics of Minghuazhen fault —boundary fault of Nangong depression,Minghuazhen fault is a kind of listric normal fault. Using the estimation formula of spading normal fault about detachment depth and extensional value advanced by I.Moretti, the detachment depth of Minghuazhen fault, about 8km, is consistent to the value that got from the deep seismic profile on the Huabei area. The reliable depth value has certain extent conference significance to petroleum exploration.
引文
雷怀玉.冀南地区勘探前景及勘探目标研究,1999
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[1]陈跃辉.不同伸展构造形成深度和水平伸展量的估算[J].华东地质学院学报,1996,4(19):5-8.
[2]王椿镛,张先康.,华北盆地滑脱构造的地震学证据[J].地球物理学报,1994,35(5):1-2.
[3]漆家福,张一伟,陆克政,等.渤海湾盆地新生代构造演化[J].石油大学学报,1995,19:1-1.
[4]解习农,任建业.断陷盆地构造作用与层序样式[J].地质评论,1996,3(42):3-4.
[5]马杏垣.中国东部中、新生代裂陷作用和伸展构造[J].地质学报,1983,57(1):34-39.
[6]漆家福,张一伟,陆克政,等.渤海湾新生代裂陷盆地的伸展模式及其动力学过程[J].石油实验地质,1995,4(17):6-7.
[7]刘国栋,史书林,王宝钧,等.华北地区壳内高导层及其与地壳构造活动性的关系[J],中国科学(B辑),1984,(4):439-448.
[8]陈发景,赵海玲,陈昭年,等.中国东部中、新生代伸展盆地构造特征及地球动力学背景[J].地球科学,1996,21(4):357-365.
[9]孙武城,祝治平,张利,等.对华北地壳上地幔的探测与研究,中国大陆深部构造的研究与进展[M].北京:地质出版社,1988:68-72.
[10]孙冬胜.渤海湾盆地冀中坳陷中区新生代复合伸展构造[J].地质论评,2004,5(50):6-8.
[11]李思田.东北中生代断陷盆地群分布规律与形成机制[A].中国中新生代盆地构造和演化[M].北京:科学出版社,1983:67-84.
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