Special Oil & Gas Reservoirs >

2021 , Vol. 28 >Issue 5: 161 - 167

DOI: https://doi.org/10.3969/j.issn.1006-6535.2021.05.023

Reservoir Engineering

Imbibition Mechanism and Model of Bedding Fractures in Shale Oil Reservoir

  • Xie Jianyong ,
  • Yuan Zhenzhu ,
  • Dai Bing ,
  • Wu Chengmei ,
  • Jia Chun ,
  • Xu Feng ,
  • Luo Qun ,
  • Cui Qian
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  • 1. SINOPEC Northwest Oil Field Company, Urumqi, Xinjiang 831700, China;
    2. China University of Petroleum (Beijing), Beijing 102249, China;
    3. Sichuan Bureau of Geology & Mineral Resources, Yibin, Sichuan 644002, China;
    4. Sichuan Bureau of Geology & Mineral Resources, Chengdu, Sichuan 610100, China

Received date: 2020-10-09

  Revised date: 2021-08-10

  Online published: 2022-02-17

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Abstract

Shale oil is mainly developed in line with the concept of making longitudinal fractures (tectonic fractures) by staged fracturing in horizontal well, without consideration of the imbibition effect of opening bedding fractures. To further study the role of bedding fractures on shale oil development, the imbibition efficiency of bedding and tectonic fractures was analyzed by means of core imbibition simulation experiment, cast slice observation and CT scanning, taking shale oil in Jimusaer Area, Xinjiang as an example. The results showed that the imbibition depth of tectonic fracture model was 1.5 cm, the imbibition depth of bedding fracture model was 1.0 cm, and the imbibition efficiency of bedding fracture was higher in surface layer; the imbibition efficiency can be increased by about 4.3% by opening the bedding fractures with the same area on the basis of opening tectonic fractures; according to the physical simulation experiment of imbibition, different oil-water imbibition conversion modes were established for tectonic fracture and bedding fracture, indicating that the development efficiency of shale oil can be greatly improved by the imbibition effect of bedding fracture on the basis of structural fracture imbibition. This study provides a theoretical basis for fracturing method optimization and shale oil recovery enhancement.

Key words： bedding fracture; tectonic fracture; shale oil; longitudinal seepage; resistivity method; seepage efficiency; imbibition pattern

Cite this article

Xie Jianyong , Yuan Zhenzhu , Dai Bing , Wu Chengmei , Jia Chun , Xu Feng , Luo Qun , Cui Qian . Imbibition Mechanism and Model of Bedding Fractures in Shale Oil Reservoir[J]. Special Oil & Gas Reservoirs, 2021 , 28(5) : 161 -167 . DOI: 10.3969/j.issn.1006-6535.2021.05.023

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