天然气地球科学

• 天然气地质学 • 上一篇    下一篇

渤海湾盆地冀中坳陷束鹿凹陷古近系沙三段下亚段致密油“甜点”主控因素与发育模式

江涛,杨德相,吴健平,胡延旭,韩琪,李彬,杨若羿,吴小梅,黄远鑫   

  1. 中国石油华北油田公司勘探开发研究院,河北 任丘 062552
  • 收稿日期:2019-04-03 修回日期:2019-07-15 出版日期:2019-08-10
  • 作者简介:江涛(1985-),男,浙江衢州人,工程师,硕士,主要从事页岩油地质研究. E-mail:yjy_jtao@petrochina.com.cn.
  • 基金资助:
    国家科技重大专项“重点盆地致密油资源潜力、甜点区预测与关键技术应用”(编号:2016ZX05046-006)资助.

Controlling factors and patterns of tight oil sweet spots in Paleogene lower Es3 of Shulu Sag of Jizhong Depression,Bohai Bay Basin

Jiang Tao,Yang De-xiang,Wu Jian-ping,Hu Yan-xu,Han Qi,Li Bin,Yang Ruo-yi,Wu Xiao-mei,Huang Yuan-xin   

  1. Exploration and Development Research Institute,PetroChina Hubei Oilfield Company,Renqiu 062552,China
  • Received:2019-04-03 Revised:2019-07-15 Online:2019-08-10

摘要: 渤海湾盆地冀中坳陷束鹿凹陷沙三段下亚段的泥灰岩—砾岩致密油气藏为一类特殊岩性致密油气藏。泥灰岩—砾岩特殊岩性致密油气藏发育于沙三段下亚段(Es3),为一套扇三角洲—湖泊相形成的特殊岩性建造,根据钻井资料与地震反射特征,沙三段下亚段可以进一步划分为1个二级层序,5个三级层序,且储层类型主要为泥灰岩和砾岩,并进一步将泥灰岩分为两类,砾岩分为三类。泥灰岩类致密油“甜点”储层主要受岩石结构、有机质丰度与成熟度以及裂缝发育程度等因素综合控制,纹层状泥灰岩为泥灰岩类“甜点”储层岩性,在SQ2湖侵域有机质丰度最高,生油能力最强,TOC值由斜坡带向洼槽区逐渐增高,成熟度增加,生油量增加,裂缝主要发育于斜坡带和断层带附近,在洼槽区则发育较少,纹层状泥灰岩主要发育在斜坡内带—洼槽区,是致密油富集的有利区带;砾岩类致密油“甜点”储层主要受岩石成分、岩石结构和裂缝发育程度、溶蚀作用共同控制,颗粒支撑陆源砾岩为砾岩类“甜点”储层岩性,发育在凹陷西部、东部斜坡带和洼槽内靠近断层附近的不同期次滑塌体“近端”和冲积扇“扇根”部位,纵向上主要发育在SQ1—SQ3地层中。

关键词: 束鹿凹陷, 泥灰岩—砾岩, 致密油, 甜点区, 沙三段下亚段

Abstract: As a peculiar tight oil/gas reservoir in lithologic,marls-conglomerate tight reservoir exist in the lower Es3 of Shulu Sag in Bohai Bay Basin.It mainly develops in fan delta-lake depositing environment.According to the drilled well data and seismic reflector characteristics,the Lower Es3 is subdivided into two 2nd-order sequences and five 3rd-order sequences.The dominant reservoir rock is marls and conglomerates,in which marls is classified into two types and conglomerates into three.Sweet area of marls-type reservoir is mainly controlled by organic matter abundance,organic matter maturity,and fractures.Laminated marls is sweet area in lithologic for marls-type reservoir.In SQ2 lake transgressive system tract,its organic matter abundance is significant indicating high hydrocarbon generating capability.From slope towards trough,its TOC is increasing and maturity is enhancing,indicating increasing hydrocarbon generating capability.Fractures develop in slope and surrounding faults,but rarely in trough.Laminated marls reservoir develops within intra slope-trough which is favorable oil accumulation area.Sweet area of conglomerates-type reservoir is controlled by rock components,rock structure,fractures and dissolution.Terrigenous grain-supported conglomerates is sweet area in lithologic for this type of reservoir.Existing in the west of sag,western slope and intra trough,this reservoir develops in the proximal part of the alluvial fan caused by slip blocks of various stages which is adjacent to faults.In vertical,this reservoir develops in SQ1-SQ3 strata.

Key words: Shulu Sag, Marls-conglomerates, Tight oil, Sweet spots, Lower Es3

中图分类号: 

  • TE122.3
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