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| 饶阳凹陷古近系沙河街组古地震记录及地质意义 |
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杨剑萍1,2,李亚3,李凤群4,李运娥4,韩娟4,安光亮4,杨鹏辉4,尹俊霞4
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(1.中国石油大学地球科学与技术学院,山东青岛 266580;2.海洋国家实验室海洋矿产资源评价与 探测技术功能实验室,山东青岛 266071;3.中国石油西南油气田分公司勘探开发研究院, 四川成都 610041;4.中国石油天然气股份有限公司华北油田分公司采油三厂,河北河间 062450)
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| 摘要: |
| 综合区域构造背景和岩心观察，对饶阳凹陷东部陡坡带、中央隆起带及北部任丘潜山上覆的古近系沙河街组地震成因的软沉积物变形构造类型、沉积特征、成因机制及地质意义展开研究。结果表明：研究区发育多种原地形成的拉伸-挤压作用及液化作用成因的软沉积物变形构造；由下至上依次为同沉积断裂层段、地震角砾岩层段、液化砂岩脉层段、软沉积变形层段和液化均层段；沙三段沉积时期是控盆边界断层以及控制潜山活动的控山断层活动强烈时期，频繁引发震级高于5级的地震，且越靠近凹陷东部断裂带，地震构造发育的类型越多；微断层、微裂缝等的形成能极大地改善储层渗透率，使之成为潜在的油气储层或油气运移通道。 |
| 关键词: 地震岩 控盆断层 沙河街组 饶阳凹陷 古近系 |
| DOI：10.3969/j.issn.1673-5005.2018.01.001 |
| 分类号:P512.2 |
| 文献标识码:A |
| 基金项目:国家自然科学基金项目（41302078）；国家科技重大专项（2011ZX05006-002） |
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| Ancient earthquake records of Palaeogene Shahejie Formation in Raoyang Sag and their geological significance |
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YANG Jianping1,2, LI Ya3, LI Fengqun4, LI Yun 'e4, HAN Juan4, AN Guangliang4, YANG Penghui4, YIN Junxia4
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(1.School of Geosciences in China University of Petroleum, Qingdao 266580,China;2.Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071,China;3.Exploration and Development Research Institute, PetroChina Southwest Oil and Gas Field Company, Chengdu 610041,China;4.Oil Plant No.3, Huabei Oilfield Branch Company of CNPC, Hejian 062450, China)
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| Abstract: |
| In Raoyang Sag, a large number of soft-sediment deformation structures caused by earthquakes were observed in Palaeogene Shahejie Formation along its east steep slope, the central uplift belt and the northern Renqiu paleoburial hill zone. These soft-sediment deformation structures were mainly autochthonously caused by liquefaction and stretch-extrusion effects. A vertical sequence of seismits could be established and classified into five intervals from bottom to top, which were syn-sedimentary fault interval, seismic breccia interval, liquefied sandstones dyke interval, soft-sediment deformation intervals and liquefies homogeneous interval, respectively. Our research shows that seismites were mostly developed in the third member of Shahejie Formation, indicating that basin-controlling and buried-hill-controlling faults were strongly active in the period and frequently triggered earthquakes of magnitude higher than 5. The closer to the eastern fault zone of the sag, the more types and bigger sizes of the seismitic structures were developed, whereas no ancient earthquake records have been found in the western gentle slope. Our results may help to recover tectonic activities and buried hill uplift features of Raoyang Sag in terms of sedimentology. Moreover, the research also has found that microfaults and microfissures developed in seismites are able to improve the reservoir permeability greatly, forming potential oil and gas reservoirs or migration channels. |
| Key words: seismites basin-controlling fault Shahejie Formation Raoyang Sag Palaeogene |
