石油学报 ›› 2020, Vol. 41 ›› Issue (10): 1229-1237.DOI: 10.7623/syxb202010007

• 油田开发 • 上一篇    下一篇

鄂尔多斯盆地延长组7段凝灰质页岩油层的润湿性及自发渗吸特征

李耀华1, 宋岩2, 徐兴友1, 白静1, 陈珊1, 刘卫彬1   

  1. 1. 中国地质调查局油气资源调查中心 北京 100083;
    2. 中国石油大学(北京)非常规油气科学技术研究院 北京 102249
  • 收稿日期:2019-11-25 修回日期:2020-05-08 出版日期:2020-10-25 发布日期:2020-11-05
  • 通讯作者: 李耀华,男,1987年9月生,2011年获东北石油大学学士学位,2019年获中国石油大学(北京)博士学位,现为中国地质调查局油气资源调查中心工程师,主要从事非常规油气资源评价及地质工程一体化工作。
  • 作者简介:李耀华,男,1987年9月生,2011年获东北石油大学学士学位,2019年获中国石油大学(北京)博士学位,现为中国地质调查局油气资源调查中心工程师,主要从事非常规油气资源评价及地质工程一体化工作。Email:majing06@126.com
  • 基金资助:

    中国地质调查局战略选区二级项目(DD201900145)资助。

Wettability and spontaneous imbibition characteristics of the tuffaceous shale reservoirs in the Member 7 of Yanchang Formation,Ordos Basin

Li Yaohua1, Song Yan2, Xu Xingyou1, Bai Jing1, Chen Shan1, Liu Weibin1   

  1. 1. Oil and Gas Survey, China Geological Survey, Beijing 100083, China;
    2. Institute of Unconventional Oil&Gas Science and Technology, China University of Petroleum, Beijing 102249, China
  • Received:2019-11-25 Revised:2020-05-08 Online:2020-10-25 Published:2020-11-05

摘要:

页岩油源-储体系内通常发育大量凝灰质泥岩层,由于大量火山凝灰质的沉积导致页岩层系内页岩油储层结构发生变化,因此,凝灰质泥岩层内烃类物质的流动性引起广泛关注。为研究页岩体系内凝灰质泥岩成分对烃类流体流动行为的影响,利用储层润湿性接触角实验表征凝灰质泥岩样品的亲油性,利用轻质油自发渗吸实验的渗吸率表征储层流体流动性。结合生烃热解实验和放射性Th、U元素测试,探讨火山凝灰质成分和残留有机质对页岩油自发渗吸作用的影响,并将这两项关键因素引入凝灰质泥岩层流体自发渗吸刻度模型,半定量刻画了火山凝灰质成分对页岩油流动能力的控制作用。研究结果表明:对于页岩油源-储体系,几乎所有凝灰质泥岩层段都是亲油性的。岩层内流体自发渗吸率随着凝灰质主控孔和残留烃覆盖孔的增加而增加,大量凝灰质沉积物自生的多孔沸石有利于提高页岩油的流动性。

关键词: 凝灰质泥岩, 页岩油, 流动性, 凝灰质主控孔, 残留烃覆盖孔, 自发渗吸

Abstract:

Plenty of tuffaceous mudstone formations are usually developed in the shale oil source-reservoir system. The structure of oil reservoir in the shale series of strata changes due to the deposition of plenty of tuff. Therefore, the mobility of hydrocarbons in tuffaceous mudstone formations has attracted widespread attention. To study the influence of the composition of tuffaceous mudstone in the shale system on the flow behavior of hydrocarbon fluids, the wettability contact angle experiment of the reservoir was performed to characterize the lipophilicity of the tuffaceous mudstone samples, and the imbibition rate of the spontaneous imbibition experiment of light oil was used to characterize the mobility of reservoir fluid. In combination with the pyrolysis experiment of hydrocarbon generation and tests of the radioactive elements Th and U, this paper studies the influence of volcanic tuff composition and residual organic matter on the spontaneous imbibition of shale oil, introduces these two key factors into the scale model of spontaneous imbibition of fluids in tuffaceous mudstone formations, and semi-quantitatively describes the control effect of the volcanic tuff composition on the mobility of shale oil. The results show that for the shale oil source-reservoir system, almost all tuffaceous mudstone intervals are lipophilic. The spontaneous imbibition rate of fluids in formations increases with the increasing quantity of tuffaceous main cotrolling pore and residual hydrocarbon covered pore. Plenty of authigenic porous zeolite in tuffaceous sediments is beneficial to improving the mobility of shale oil.

Key words: tuffaceous shale, shale oil, mobility, tuffaceous main cotrolling pore, residual hydrocarbon covered pore, spontaneous imbibition

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