石油与天然气地质 ›› 2018, Vol. 39 ›› Issue (1): 175-182,191.doi: 10.11743/ogg20180117

• 油气地质 • 上一篇    下一篇

孤北洼陷长堤断裂带扇三角洲砂砾岩体沉积特征及空间展布规律

邱隆伟1, 贾继成1, 马立驰2, 杨勇强1, 孙超2, 辛也2, 王鑫3, 杨生超4   

  1. 1. 中国石油大学(华东), 山东 青岛 266580;
    2. 中国石化 胜利油田 地质科学研究院, 山东 东营 257015;
    3. 中国石油 新疆油田公司 采油一厂, 新疆 克拉玛依 834000;
    4. 南京大学, 江苏 南京 210023
  • 收稿日期:2016-01-15 修回日期:2018-01-04 出版日期:2018-02-28 发布日期:2018-03-12
  • 第一作者简介:邱隆伟(1967-),男,教授,沉积学及储层地质学。E-mail:qiulwsd@163.com。
  • 基金项目:
    国家科技重大专项（2016ZX05009-002）；山东省自然科学基金联合专项（ZR2016DL05）。

Sedimentary characteristics and spatial distribution of coarse clastic rocks of fan delta in Changdi fault zone in Gubei sub-sag, Jiyang Depression

Qiu Longwei1, Jia Jicheng1, Ma Lichi2, Yang Yongqiang1, Sun Chao2, Xin Ye2, Wang Xin3, Yang Shengchao4   

  1. 1. School of Geosciences, China University of Petroleum, Qingdao, Shandong 266580, China;
    2. Research Institute of Geological Sciences, Shengli Oilfield Company, SINOPEC, Dongying, Shandong 257015, China;
    3. First Oil Production Plant of Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China;
    4. Nanjing University, Nanjing, Jiangsu 210023, China
  • Received:2016-01-15 Revised:2018-01-04 Online:2018-02-28 Published:2018-03-12

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摘要： 受多种地质作用的联合控制，断陷湖盆陡坡带内的扇三角洲型砂砾岩体在空间展布上具有较大的差异。综合利用岩心、测井和地震等资料，系统研究了孤北洼陷长堤断裂带周缘砂砾岩体的空间分布特征，分析了砂砾岩体形成的主控因素。研究表明砂砾岩体的形成主要受断层活动强度、湖平面变化和物源供给等因素控制，不同地区影响因素作用的强弱导致砂砾岩体分布的差异性。长堤断裂带北部地区断裂活动强，物源供给充足，扇体发育的规模较大，在剖面上多表现为多期垂向加积的特点，扇体前部往往发育大规模的滑塌浊积扇；南部地区断裂活动较弱，且物源供给弱，扇体发育的规模小，在剖面上表现为先退积后进积的叠加样式。受次级断层交替活动的影响，扇体在垂直物源方向上表现为多期的楔形叠加。总体上有利的相带，扇体的侧向尖灭和顶部泥岩的封堵联合控制了研究区油气的分布。

关键词: 砂砾岩体, 次级断层, 沙河街组, 沾化凹陷, 济阳坳陷

Abstract: Fan delta coarse clastic rocks on steep slopes of faulted lacustrine basins have large variability in spatial distribution due to the joint control of various geological factors.Various data including core, log and seismic data are integra-ted to investigate the spatial distribution characteristics and the main controlling factors on formation of the fan delta coarse clastic rocks in the 2nd to the Upper 4th Member of the Eocene Shahejie Formation on the periphery of Changdi fault zone in Gubei sub-sag.The study results show that the development of fan delta coarse clastic rocks are controlled by the intensity of fault activity, change of lake level and sediment supply.The contributions of each influential factor are different in different areas, resulting in the differences of distribution of these fan delta coarse clastic rocks.In the northern part of Changdi fault zone, fault activities are strong and sediment supply is sufficient, thus the fan delta deposits are large in scale and are characterized by vertical aggradation of multiple stages on sectional view.In addition, large slump turbidite fans are common in fan front.On the contrary, in the southern part of the fault zone, faulting is relatively weak and sediment supply is insufficient, thus the fans are small in scale and show a superimposition pattern of early retrogradation and late progradation.Owing to the alternative activity of secondary faults, the fan delta coarse clastic rocks are characterized by wedge-shaped superimposition of multiple stages in the direction of perpendicular to provenance.In general, the distribution of oil and gas in the study area are controlled by favorable sedimentary facies zones, lateral pinch out of the fans and sealing of top mudstone.

Key words: coarse clastic rock, secondary fault, Shahejie Formation, Zhaihua sag, Jiyang Depression

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