Special Oil & Gas Reservoirs >

2024 , Vol. 31 >Issue 4: 96 - 102

DOI: https://doi.org/10.3969/j.issn.1006-6535.2024.04.012

Geologic Exploration

Methods and Applications for Characterizing Pore Structure and Determining Physical Property Lower Limit in Shale Reservoirs

  • Zhou Zhijun ,
  • Zhang Guoqing ,
  • Cui Chunxue ,
  • Bao He ,
  • Ren Shuai ,
  • Wang Jingyi
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  • 1. Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development ( Northeast Petroleum University), Ministry of Education, Daqing, Heilongjiang 163318, China;
    2. Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;
    3. CNOOC China Limited,Tianjin branch, Tianjin 300452, China;
    4. PetroChina Daqing Oilfield Co.,Ltd., Daqing, Heilongjiang 163318, China

Received date: 2023-04-12

  Revised date: 2024-05-03

  Online published: 2024-09-20

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Abstract

Inadequate comprehension of the pore structure and physical properties of shale reservoirs impedes precise calculation of shale oil reserves and efficient development seriously. This study focuses on the core holes of Xinyishen-9, Liye-1, and wells Fanye-1 in the Paleogene Shahejie Formation within the Jiyang Depression. The pore structure of shale reservoirs is comprehensively characterized using N2 adsorption, high-pressure mercury injection,physical properties measurement, and other experimental methods. Additionally, we determined the physical property cutoffs through a comprehensive approach involving irreducible water saturation method, pressed mercury displacement method, minimum flow pore-throat radius method, and oil testing method. The findings indicate that the nitrogen adsorption experiment primarily characterizes the small pores of shale samples. The pore morphology in the study area predominantly comprises ink bottle, transition, and flat types, mainly featuring nano-scale pores with a radius ranging from 1.50 to 40.00 nm and an average pore radius of 16.00 nm. Moreover, the high-pressure mercury injection experiment focuses on characterizing mesopores and macropores of shale, revealing a pore throat radius range of 0.03 ~ 66.13 μm. The lower limit of shale reservoir porosity falls within the range of 1.30% to 3.82%, while permeability's cutoff is between 0.03 ~ 0.12 mD, the minimum flow pore-throat radius is 14.60~23.50 nm and average value is 17.76 nm. The research outcomes offer valuable parameter indexes and technical support for reserve calculation and reservoir evaluation in Jiyang Depression's shale oil exploration.

Key words： shale oil; pore structure; lower limit of physical property; Jiyang Depression

Cite this article

Zhou Zhijun , Zhang Guoqing , Cui Chunxue , Bao He , Ren Shuai , Wang Jingyi . Methods and Applications for Characterizing Pore Structure and Determining Physical Property Lower Limit in Shale Reservoirs[J]. Special Oil & Gas Reservoirs, 2024 , 31(4) : 96 -102 . DOI: 10.3969/j.issn.1006-6535.2024.04.012

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