| 冀中坳陷北部古近纪构造差异变形及控制因素 |
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| 引用本文： | 苗全芸,漆家福,马兵山,时聪,倪强,李熹微,刘慧.冀中坳陷北部古近纪构造差异变形及控制因素[J].大地构造与成矿学,2019,43(1):46-57. |
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| 作者姓名： | 苗全芸 漆家福 马兵山 时聪 倪强 李熹微 刘慧 |
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| 作者单位： | 中国石油大学(北京) 油气资源与探测国家重点实验室,北京,102249;中国石油 华北油田分公司,河北 任丘,062550 |
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| 基金项目： | 饶阳凹陷中部地区构造特征及对油气成藏的控制作用研究资助 |
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| 摘 要： | 基于三维及部分二维地震地质构造解释,详细阐述了冀中坳陷北部各凹陷沉积序列结构、水平伸展量、基底沉降及主边界断层活动性。研究表明,冀中坳陷北部大厂?廊固断陷(带)与武清?霸县断陷(带)为两个斜列的古近纪凹陷带,二者在古近纪存在明显的差异构造变形。前者沉积地层为E1-2k、较厚的E_2s^4与E_2s^3及少量E_2s^2,其中E_2s^4及E_2s^3顶部存在大角度不整合面;水平伸展主要集中于E_2s^4及E_2s^3沉积期且在二者沉积末期均存在明显的基底面抬升现象。后者沉积地层相对完整,但以E_3s^1及E_3d为主;水平伸展也主要集中于E_3s^1及E_3d沉积期。本文探讨了冀中坳陷北部古近纪伸展构造变形主控制因素,结果显示E_2s^4及E_2s^3沉积末期强烈火山活动所伴随岩浆上涌底辟作用为主导因素。岩浆上涌源于软流圈局部热隆升,岩浆底辟作用引起大厂?廊固断陷(带)主控边界断层即大厂断层与大兴断层在E_2s^4及E_2s^3沉积末期弯曲变形,上部沉积地层随之隆升遭受剥蚀。E_3s^1及E_3d沉积期,断层弯曲右翼的牛东断层、大北伊断层及河西务断层取代大厂断层及大兴断层继续活动,控制了武清?霸县断陷(带)。
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| 关 键 词： | 差异构造变形 控制因素 古近纪 冀中坳陷北部 |
Differential Deformation and Control Mechanism of Paleogene Structures in Northern Jizhong Depression |
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| MIAO Quanyun,QI Jiafu,MA Bingshan,SHI Cong,NI Qiang,LI Xiwei,LIU Hui.Differential Deformation and Control Mechanism of Paleogene Structures in Northern Jizhong Depression[J].Geotectonica et Metallogenia,2019,43(1):46-57. |
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| Authors: | MIAO Quanyun QI Jiafu MA Bingshan SHI Cong NI Qiang LI Xiwei LIU Hui |
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| Institution: | (State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum,Beijing 102249,China;PetroChina Huabei Oilfield Company,Renqiu 062550,Hebei,China) |
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| Abstract: | Based on the 3D and 2D seismic interpretations,this^paper elaborate the sedimentary sequence,horizontal extension,basement subsidence and activity of the major boundary faults^in the northern Jizhong Depression.The results^reveal that the structure styles^of the Dachang-Langgu and Wuqing-Baxian Sags^in Paleogene are different.The strata of E 1-2 k,E 2 s^4,E 2 s^3 and E 2 s^2 mainly deposited in the Dachang-Langgu Sag(s).The development of the large angle unconformities^in the upper of E 2 s^4 and E 2 s^3 are consistent with the horizontal extension during the sedimentation of E 2 s^4 and E 2 s^3 members^and the obvious^basement uplift in the end of E 2 s^4 and E 2 s^3 sedimentation as^is^revealed by basement subsidence analysis.In the Wuqing-Baxian Sag(s),the E 3 s^1 and E 3 d are the main strata,and the horizontal extension mainly took place during the sedimentation of E 3 s^1 and E 3 d.Our analyses^reveal that the magma diapirism and volcanic activity in the end of E 2 s^4 and E 2 s^3 sedimentation are likely the main factors^controlling the differential deformation.It is^proposed that the upwelling of asthenospheric mantle and the resultant magma diapirism led to the deformation of the Dachang and Daxing faults.The upper part of the sediments^was^denudated as^a result of the deformation of the faults.The Niudong,Dabeiyi and Hexiwu faults^experienced extensional deformation during the sedimentation of E 3 s^1 and E 3 d,and replaced the Daxing and Dachang faults. |
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| Keywords: | differential deformation control mechanism Paleogene northern Jizhong Depression |
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