石油勘探与开发 >

2020 , Vol. 47 >Issue 6: 1244 - 1255

DOI: https://doi.org/10.11698/PED.2020.06.18

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鄂尔多斯盆地三叠系延长组长73亚段富有机质页岩纹层组合与页岩油富集模式

  • 葸克来 ,
  • 李克 ,
  • 操应长 ,
  • 林敉若 ,
  • 牛小兵 ,
  • 朱如凯 ,
  • 魏心卓 ,
  • 尤源 ,
  • 梁晓伟 ,
  • 冯胜斌
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  • 1.中国石油大学（华东）深层油气重点实验室,山东青岛 266580;
    2.海洋国家实验室海洋矿产资源评价与探测技术功能实验室,山东青岛 266071;
    3.中国石油长庆油田公司,西安 710021;
    4.中国石油勘探开发研究院,北京 100083
葸克来（1988-）,男,甘肃会宁人,博士,中国石油大学（华东）地球科学与技术学院副教授,主要从事非常规油气储集层地质学方面的教学和科研工作。地址：山东省青岛市黄岛区长江西路66号,中国石油大学地球科学与技术学院,邮政编码：266580。E-mail: xikelai@upc.edu.cn

收稿日期: 2020-02-19

  修回日期: 2020-11-05

  网络出版日期: 2020-11-27

基金资助

国家自然科学基金石油化工联合基金重点项目（U1762217）; 中央高校基本科研业务经费项目（19CX02009A）

收起

Laminae combination and shale oil enrichment patterns of Chang 73 sub-member organic-rich shales in the Triassic Yanchang Formation, Ordos Basin, NW China

  • XI Kelai ,
  • LI Ke ,
  • CAO Yingchang ,
  • LIN Miruo ,
  • NIU Xiaobing ,
  • ZHU Rukai ,
  • WEI Xinzhuo ,
  • YOU Yuan ,
  • LIANG Xiaowei ,
  • FENG Shengbin
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  • 1. Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao 266580, China;
    2. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China;
    3. PetroChina Changqing Oilfield Company, Xi'an 710065, China;
    4. PertroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China

Received date: 2020-02-19

  Revised date: 2020-11-05

  Online published: 2020-11-27

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摘要

以鄂尔多斯盆地三叠系延长组长73亚段为例,综合运用岩心观察、薄片鉴定、X射线荧光元素分析、X-衍射分析、扫描电镜、高分辨率激光拉曼光谱、显微红外光谱等分析方法,对富有机质页岩层系中的纹层类型与组合、储集空间特征及页岩油富集模式进行系统研究。根据纹层的矿物组成、厚度等,富有机质页岩中主要发育富凝灰质纹层、富有机质纹层、粉砂级长英质纹层和黏土纹层4种纹层类型。长73亚段可划分出“富有机质+粉砂级长英质”纹层组合页岩和“富有机质+富凝灰质”纹层组合页岩两类主要的页岩油发育层系。“富有机质+粉砂级长英质”组合页岩层系的原油成熟度较高,主要富集于富有机质页岩内粉砂级长英质纹层的钾长石溶孔中,形成了页岩内部纹层之间的“生-运-聚”过程。“富有机质+富凝灰质”纹层组合页岩层系中,富有机质页岩本身储集性能差,原油成熟度较低,充注时间早,主要富集于砂岩薄夹层内保留的原生粒间孔隙中,形成了富有机质页岩到砂岩薄夹层的“生-运-聚”过程。图10参28

关键词： 富有机质页岩; 纹层组合; 富集模式; 页岩油; 三叠系延长组; 鄂尔多斯盆地

本文引用格式

葸克来 , 李克 , 操应长 , 林敉若 , 牛小兵 , 朱如凯 , 魏心卓 , 尤源 , 梁晓伟 , 冯胜斌 . 鄂尔多斯盆地三叠系延长组长73亚段富有机质页岩纹层组合与页岩油富集模式[J]. 石油勘探与开发, 2020 , 47(6) : 1244 -1255 . DOI: 10.11698/PED.2020.06.18

Abstract

The Chang 73 sub-member of Triassic Yanchang Formation in the Ordos Basin was taken as an example and the lamina types and combinations, reservoir space features and shale oil enrichment patterns in organic-rich shale strata were investigated using core observation, thin section analysis, XRF element measurement, XRD analysis, SEM, high solution laser Raman spectroscopy analysis, and micro-FTIR spectroscopy analysis, etc. According to the mineral composition and thickness of the laminae, the Chang 73 organic-rich shales have four major types of laminae, tuff-rich lamina, organic-rich lamina, silt-sized feldspar-quartz lamina and clay lamina. They have two kinds of shale oil-bearing layers, “organic-rich lamina + silt-sized feldspar-quartz lamina” and “organic-rich lamina + tuff-rich lamina” layers. In the “organic-rich + silt- sized feldspar-quartz” laminae combination shale strata, oil was characterized by relative high maturation, and always filled in K-feldspar dissolution pores in the silt-sized feldspar-quartz laminae, forming oil generation, migration and accumulation process between laminae inside the organic shales. In the “organic-rich + tuff-rich lamina” binary laminae combination shale strata, however, the reservoir properties were poor in organic-rich shales, the oil maturation was relatively lower, and mainly accumulated in the intergranular pores of interbedded thin-layered sandstones. The oil generation, migration and accumulation mainly occurred between organic-rich shales and interbedded thin-layered sandstones.

Key words： organic-rich shale; laminae combination; oil enrichment patterns; shale oil; Triassic Yanchang Formation; Ordos Basin

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