Tectonic feature and evolution mechanism of central anticline belt of Dongying Sag, Bohai Bay Basin
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摘要: 渤海湾盆地东营凹陷沙四段盐膏层和沙三段超压泥岩层等塑性物质的存在,为弹性基础悬臂梁理论在该区的应用提供了必要的物质基础.自沙四段沉积晚期开始,东营凹陷东段的受力以及变形状态就类似于以下伏盐膏层为弹性基础,以南部广饶凸起为固定端,以北部陈南断层为自由端的弹性基础悬臂梁,在自身重力以及上覆沉积物载荷不断增大的情况下,自由端的沉降幅度逐渐增大,使得盆地整体呈箕状产出,在这个沉降过程中,塑性物质不断流动聚集,对上覆地层造成拱升,从而形成中央背斜带.此后悬臂梁又一分为二,单独作用,继续推动着整个凹陷的演化进程.Abstract: The present of plastic substances such as evaporate beds in the 4th member (Es4) of the Shahejie Formation and the over-pressured mudstone layers in the 3rd member (Es3) of the Shahejie Formation in the Dongying Sag provides the necessary material foundation for the application of Cantilever theory in this area.Since the late Es4 period,the loading state in the east of the Dongying Sag as well as its deformation resembled a plastically-founded cantilever which was based on the underlying cream salt layer,fixed on the southern Guangrao Uplift and free on the northern Chennan Fault.With its own gravity and the growing load of overburden sediments,the amplitude of sinking in the free end was gradually increasing,making the basin look like a dustpan.During the sinking,plastic substances kept flowing and aggregating,forcing the overburden layer to arch and finally forming the central anticline belt.Then the cantilever split into two parts which performed individually and continued to drive the evolution of the Dongying Sag.
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Key words:
- cantilever /
- evolution mechanism /
- evaporate bed /
- central anticline belt /
- Dongying Sag /
- Bohai Bay Basin
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[1] 谢向阳,信荃麟.东营凹陷中央隆起带断块模式[J].断块油气田,1997,4(5):15-19. [2] 云金表,赵利华.东营凹陷中央隆起带构造特征、沙箱模拟与形成机制研究[J].地质力学学报,2003,9(2):113-121. [3] 任建业,张青林.东营凹陷中央背斜隆起带形成机制分析[J].大地构造与成矿学,2004,28(3):254-262. [4] 于建国,李三忠,王金锋,等.东营凹陷盐底辟作用与中央隆起带断裂构造成因[J].地质科学,2005,40(1):55-68. [5] 马丽娟,郑和荣,解习农.东营凹陷中央隆起带断裂构造及油气运移[J].石油与天然气地质,2005,26(2):246-251. [6] 王勇,熊伟,崔营滨.东营凹陷陡坡带构造演化物理模拟[J].断块油气田,2011,18(4):449-452. [7] 刘晓峰,解习农,姜涛,等.东营凹陷盐—泥层构成及其特征[J].地球科学——中国地质大学学报,2005,30(5):604-608. [8] 别辽耶夫 H M.材料力学[M].干光瑜,译.北京:高等教育出版社,1956. [9] Williams G,Vann I.The geometry of listric normal faults and deformation in their hanging walls[J].Journal of Structural Geology,1987,9(7):11-16. [10] Kusznir N J,Ziegler P A.The mechanics of continental extension and sedimentary basin formation: A simple-shear/pure-shear flexural cantilever model[J].Tectonophysics,1992,215:117-131. [11] 张宏卫,邓起东.不对称盆地形成机制探讨:以渭河盆地为例[J].中国地震,1992,8(1):28-37. [12] 李扬鉴,林梁,赵宝金.中国东部中、新生代断陷盆地成因机制新模式[J].石油与天然气地质,1988,9(4):34-345. [13] 李扬鉴,张星亮,陈延成.中国东部中新生代盆—山系及有关地质现象的成因机制[J].中国区域地质,1996(1):88-89,91-95. [14] 李扬鉴,张星亮,陈延成.大陆层控构造导论[M].北京:地质出版社,1996: 15-16,44-53,60. [15] 李丕龙,翟庆龙,荣启宏,等.东营凹陷中央背斜带油气运移聚集特征[J].石油勘探与开发,2000,27(4):64-66. [16] 宗国洪,肖焕钦,李常宝,等.济阳坳陷构造演化及其大地构造意义[J].高校地质学报,1999,5(3):275-282. [17] 刘展,赵键,李云平,等.东营凹陷盐膏层的重震联合解释技术[J].石油大学学报:自然科学版,2005,29(6):16-22. [18] 刘晖,操应长,姜在兴,等.渤海湾盆地东营凹陷沙河街组四段膏盐层及地层压力分布特征[J].石油与天然气地质,2009,30(3):287-293. [19] 戴俊生.构造地质学及大地构造[M].北京:石油工业出版社,2006. [20] 刘士林,郑和荣,林舸,等.渤海湾盆地东营凹陷异常压力分布和演化特征及与油气成藏关系[J].石油实验地质,2010,32(3):233-237,241. [21] 邱楠生,苏向光,李兆影,等.济阳坳陷新生代构造—热演化历史研究[J].地球物理学报,2006,49(4):1127-1135. -
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