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近岸水下扇微相划分研究及意义初探——以滦平盆地下白垩统西瓜园组为例
投稿时间:2019-06-19  修订日期:2019-10-06  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020029
摘要点击次数: 150
全文下载次数: 124
作者单位E-mail
白立科 中国石油大学(华东)地球科学与技术学院 b495093084@163.com 
邱隆伟 中国石油大学(华东)地球科学与技术学院  
杨勇强 中国石油大学(华东)地球科学与技术学院  
杜玉山 中国石化股份胜利油田分公司 勘探开发研究院  
王军 中国石化股份胜利油田分公司 勘探开发研究院  
韩晓彤 中国石油大学(华东)地球科学与技术学院  
董道涛 中国石油大学(华东)地球科学与技术学院  
杨保良 中国石油大学(华东)地球科学与技术学院  
汪丽芳 中国石化股份胜利油田分公司 孤岛采油厂工艺研究所  
基金项目:国家科技重大专项、国家自然科学基金
中文摘要:滦平盆地下白垩统西瓜园组沉积期发育大量的粗碎屑岩沉积,通过野外实地考察以及结合无人机摄影技术,将流体搬运机制与微相划分相结合,对断陷湖盆内部粗碎屑沉积体进行详细研究。结果表明:滦平盆地西瓜园组沉积期北部受边界断层活动影响,发育典型陆相断陷湖盆的近岸水下扇沉积体系。根据露头观测及研究,可划分出扇根、扇中及扇端三种亚相。其中扇根亚相以碎屑物质直接入湖、岩性较粗、分选极差、无磨圆为特征。扇中亚相采用“水下河道微相”及“边缘微相”的划分方式,水下河道微相可见同时发育由碎屑流及浊流两种不同流体性质控制的沉积体,沉积迅速,界限清晰且含轻微冲刷,横向连续性较为稳定,砾石出现一定定向性,磨圆较差,在扇中亚相中最为发育;边缘微相沉积相对较为混杂,漂砾较为常见,可见明显的板状交错层理,横向连续性差,指示河道的改道或者边缘沉积,不发育冲刷-充填构造。扇端亚相以砂泥岩薄互层或者厚层细砂岩为特征,可见细小砾石层。微相划分方法结合流体搬运机制及沉降方式,更加具有成因性依据,同时更好地解释了远离物源区的稳定砾石层发育。研究结果为近岸水下扇内部砂体发育规律和叠置关系研究及下一步油气勘探与开发提供了新思路。
中文关键词:近岸水下扇  粗碎屑岩  沉积特征  滦平盆地
 
The Micro-facies Division and Significance Preliminary Study of Nearshore Subaqueous Fan: a case study in Xiguayuan Formation of Lower Cretaceous in Luanping Basin
Author NameAffiliationE-mail
BaiLike School of Geosciences, China University of Petroleum (East China) b495093084@163.com 
QiuLongwei School of Geosciences, China University of Petroleum (East China)  
YangYongqiang School of Geosciences, China University of Petroleum (East China)  
DuYushan Research Institute of Exploration & Development, SINOPEC Shengli Oilfield Company  
WangJun Research Institute of Exploration & Development, SINOPEC Shengli Oilfield Company  
HanXiaotong School of Geosciences, China University of Petroleum (East China)  
DongDaotao School of Geosciences, China University of Petroleum (East China)  
YangBaoliang School of Geosciences, China University of Petroleum (East China)  
WangLifang Technology Research Institute of Gudao Oil Production Plant, SINOPEC Shengli Oilfield Company  
Abstract:A large number of coarse clastic rock deposits were developed in Lower Cretaceous Xiguayuan Formation in the Luanping Basin. Based on 3D digital model as well as manual photography of typical outcrops, combing with fluid transportation mechanism, micro-facies identification and debris deposits in fault depressed lacustrine basin were studied in detail. The results show that the northern part of Luanping Basin in Xiguayuan Formation is affected by the boundary fault activity, and the nearshore subaqueous fan deposition system of the typical fault basin is developed. According to outcrop observation and research, three sub-facies including root fan, mid fan and fan end can be divided. Among them, the root fan sub-facies are characterized by the fact that the detrital clasts directly enters the lake, the lithology is coarse, the sorting is extremely poor, and there is no rounding. The mid fan adopt the division method of “subaqueous channel micro-facies” and “marginal micro-facies”. The micro-facies of the subaqueous channel sediments were controlled by two different fluid properties of debris flow and turbidity flow which are developed simultaneously. The boundary is clear and slightly scoured, the lateral continuity is relatively stable, the gravel has a certain orientation, the rounding is poor, and it is most developed in the mid fan; the marginal facies are relatively mixed, the boulder is more common, and the obvious plate is visible. Interlaced bedding, poor lateral continuity, indicating diversion or marginal deposition of rivers, and no development of erosion-filling structures. The fan end sub-facies are characterized by thin-interbedded sandstone or thick layer of fine sandstone, showing bioturbation structures and fine gravel layers. The micro facies division method is more of a causal basis. The research results provide a new idea for the identification of nearshore subaqueous fans in similar basins and underground research and will be conducive with the oil and gas exploration and development.
keywords:nearshore subaqueous fan  coarse clastic rock  sedimentary characteristic  Luanping Basin
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