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| 利津洼陷北部陡坡带水下扇搬运机制及发育规律 |
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杨保良1,2,邱隆伟1,2,杨勇强1,2,王晔磊1,2,南佳盟1,2,徐宁宁3,徐爽4,张华锋5
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(1.中国石油大学(华东)地球科学与技术学院, 山东青岛 266580;2.中国石油大学(华东)深层油气重点实验室,山东青岛 266580;3.中国石化石油物探技术研究院, 江苏南京 211103;4.中国石化胜利油田分公司东辛采油厂,山东东营 257061;5.中国石化胜利油田分公司勘探开发研究院,山东东营 257000)
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| 摘要: |
| 为探讨断陷湖盆陡坡带砂砾岩体沉积样式及其搬运机制、发育规律,基于渤海湾盆地东营凹陷北部陡坡带利津地区沙四上纯下亚段砂砾岩体内部地震反射特征,结合测井、岩心等资料开展系统沉积学研究。结果表明:利津地区沙四上纯下亚段砂砾岩存在高角度退积反射相、前积反射相、低角度退积反射相等地震相类型;研究区砂砾岩沉积主要发育地震活动相关的突发性洪水触发的异重流,扇体末端发育低密度浊流与湖相沉积,伴随少量滑塌沉积;其发育受控于断层幕式构造活动和洪水注入强度；早期伴随边界断裂幕式活动,基底沉降速率快,砂砾岩垂向上呈退积式叠置；边界断层倾角约为26°~32°;晚期构造活动减弱至稳定,随着早期扇体沉积,地形逐渐变缓,陡坡面斜坡角度小于18°,洪水注入强度影响砂砾岩垂上叠置样式。 |
| 关键词: 砂砾岩 搬运机制 地震活动相关的异重流 利津地区 陡坡带 东营凹陷 |
| DOI：10.3969/j.issn.1673-5005.2022.02.003 |
| 分类号::TE 121.1 |
| 文献标识码:A |
| 基金项目:国家科技重大专项 (2017ZX05009-002,2017ZX05072-002)；国家自然科学基金项目(41972099) |
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| Sediment transport mechanism and development characteristics of subaqueous fan in the northern steep slope zone of Lijin sag |
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YANG Baoliang1,2, QIU Longwei1,2, YANG Yongqiang1,2, WANG Yelei1,2, NAN Jiameng1,2, XU Ningning3, XU Shuang4, ZHANG Huafeng5
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(1.School of Geosciences in China University of Petroleum(East China), Qingdao 266580, China;2.Key Laboratory of Oil and Gas in China University of Petroleum(East China), Qingdao 266580, China;3.Geophysical Research Institute, SINOPEC, Nanjing 211103, China;4.Dongxin Oil Production Plant, Shengli Oilfield Company, SINOPEC, Dongying 257061, China;5.Research Institute of Exploration and Development, Shengli Oilfield Company, SINOPEC, Dongying 257000, China)
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| Abstract: |
| This paper aims to analyze the deposition style and its transport mechanisum and development characteristics of the sandy conglomerate in the steep slope zone of a rift basin.Based on the internal seismic reflection characteristics of the sandy conglomerate body, the study targeted the lower part of the upper sub-member of the 4th member of the Eocene Shahejie Formation (Es4scx) in Lijin area in the northern steep slope zone of Dongying depression in Bohai Bay Basin by systematically analyzing the logging and core data. There are three types of seismic facies:high-angle retrograding seismic facies, low-angle retrograding seismic facies, and prograding seismic facies. The outburst-flood triggered hyperpycnal flow associated with the tectonic activity developed in the study area, and low-density turbidity currents and lacustrine deposits developed at the end of the fan, accompanied by a small number of slump deposits.The development of the sandy conglomerateis controlled by episodic tectonic activities and the strength of floods. In the early stage, with episodic boundary fault activities, the basement subsidence rate is fast, and the sandy conglomerate presents a retrograded pattern superimposed in the vertical direction. The boundary faults have a dip angle of about 26°-32°. Late tectonic activities weakens the stability, as the early fans deposits, the terrain gradually becomes flat, with a steep slope angle of less than 18°. The sandy conglomerate superimposed vertically is affected by the strength of the floods. |
| Key words: sandy conglomerate transport mechanism hyperpycnal flow associated with tectonic activity Lijin area steep slope zone Dongying depression |
