东濮凹陷碎屑岩沉积充填特征及变化对构造活动的响应
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1.中国石化中原油田分公司勘探开发研究院;2.中国石化中原石油工程有限公司钻井三公司

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中图分类号:

TE122

基金项目:

国家科技攻关计划


The sedimentary filling characteristics of clastic rocks and their responses to tectonic activities in Dongpu depression
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Affiliation:

Research Institute of Exploration and Development,Zhongyuan Oilfield,SINOPEC

Fund Project:

The National Key Technologies R&D Program of China

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    摘要:

    东濮凹陷为渤海湾盆地西南端的一陆相断陷湖盆,具有砂层薄、粒度细和非均质性显著的沉积特征。盆地在古近系的沉积演化受频繁构造活动影响显著。本文通过研究古近系沙河街组碎屑岩尤其是盆缘的砾岩特征,分析不同构造变革期沉积物组成类型特征及变化,明确不同时期沉积充填对断裂活动的响应:盆地形成初期兰聊断裂的活动,东西两侧物源类型差异小,组成相对单一,均以中生界碎屑岩为主;随着构造活动频发和流域面积的增加,在沙三下文西、卫西、观城、马寨、马厂和三春集等断裂活动,湖盆水体加深,并出现多个沉降中心,东西两侧沉积体系和物源组成发生变化,砾石成分显示西侧物源中上古生界碎屑岩和下古生界碳酸盐岩、中生界火山岩和太古界基底变质岩逐渐增加,东侧上古生界物质比例增加;沙三中长垣断层和黄河断层活动造成南北差异显著,出现多源混合,砾石成分复杂度最高;至沙二期北部文东、卫东、文明寨等断层活动,东部洼陷沉降幅度增加,东侧近源物质大量充填砾石成分以上古生界碎屑岩和下古生界碳酸盐岩为主。沉积物的变化直接反映了各时期构造活动的强弱记录了盆地的演化历史,对认识同沉积断裂活动影响下储层砂体的发育及烃源岩的展布具有重要意义。

    Abstract:

    Dongpu Sag is a continental faulted lake basin in the southwest of Bohai Bay Basin.The sedimentary evolution of the basin in the Paleogene is significantly affected by frequent tectonic activities.In this paper, through the study of ancient Sha-he-jie formation conglomerate characteristics of clastic rock, especially the basin edge, and analyzd the characteristic of the different tectonic transformation time of sediment type change, cleared sedimentary response of faulting in different periods: basin formed Lanliao fracture activity, small things on both sides of the content source type difference, form is relatively single, give priority to with Mesozoic clastic rock;With the increase of frequent tectonic activity and the basin area,Wenxi, Weixi, Guanchen, Mazhai, Machang and San-chun-ji fault activities in the Sha-san-xia, such as lake basin water deepened, and multiple settlement center, things on both sides of the change of sedimentary system and material sources, gravel composition displayed on the provenance of clastic rocks, upper palaeozoic carbonate rocks and lower palaeozoic era, the Mesozoic volcanic rocks and the archean erathem basement metamorphic rocks increases gradually, on the east side of material proportion, upper palaeozoic increases;The activities of the placanticline fault and the Yellow River fault in the middle of sha-san resulted in significant north-south differences, multi-source mixing and the highest complexity of gravel composition. Due to the fault activities in the northern part of the second shahe period, such as Wendong, Weidong and Wen-ming-zhai, the subsidence range of the eastern sag increased, and the Paleozoic clastic rocks and lower Paleozoic carbonate rocks above the gravel composition of the near-source materials in the east side were mainly Paleozoic clastic rocks and lower Paleozoic carbonate rocks. The change of sediments directly reflects the strength of tectonic activities in each period, and records the evolution history of the basin, which is of great significance for understanding the development of reservoir sand bodies and the distribution of hydrocarbon source rocks under the influence of synsedimentary fault activities.

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引用本文

靳亚勤,杨栋栋,蒋飞虎,等. 东濮凹陷碎屑岩沉积充填特征及变化对构造活动的响应[J]. 科学技术与工程, 2019, 19(29): 83-89.
Jin ya-qin,,Jiang feihu, et al. The sedimentary filling characteristics of clastic rocks and their responses to tectonic activities in Dongpu depression[J]. Science Technology and Engineering,2019,19(29):83-89.

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  • 收稿日期:2019-03-22
  • 最后修改日期:2019-05-17
  • 录用日期:2019-06-04
  • 在线发布日期: 2019-10-25
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