Investigation on Pore Structures of Yanchang Formation Shale Using Micro X-ray Microscopy

WANG Yu; WANG Li-hua; WANG Jian-qiang; WANG Yan-fei

doi:10.15898/j.cnki.11-2131/td.202003110030

Rock and Mineral Analysis > 2020 > 39(4): 566-577. > DOI: 10.15898/j.cnki.11-2131/td.202003110030

WANG Yu, WANG Li-hua, WANG Jian-qiang, WANG Yan-fei. Investigation on Pore Structures of Yanchang Formation Shale Using Micro X-ray Microscopy[J]. Rock and Mineral Analysis, 2020, 39(4): 566-577. DOI: 10.15898/j.cnki.11-2131/td.202003110030

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Investigation on Pore Structures of Yanchang Formation Shale Using Micro X-ray Microscopy

1.
Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
2.
University of Chinese Academy of Sciences, Beijing 100049
3.
Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, China
4.
Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

More Information

Received Date: March 10, 2020
Revised Date: April 11, 2020
Accepted Date: April 22, 2020
Published Date: June 30, 2020

Abstract

HIGHLIGHTS
(1) Synchrotron micro X-ray microscopy was adopted for characterization of the laminated structures of a typical terrestrial shale.

ABSTRACT

BACKGROUNDShale pore structure is the key to determine reservoir storage and migration capacity. It is of great significance for improving the productivity assessment of continental shale gas in China, and fracturing technology.
OBJECTIVESTo investigate the pore structure and three dimensional distribution mode of the seventh member of Yanchang Formation shale and its controlling factors.
METHODSAr-ion milling SEM and synchrotron micro X-ray microscopy were used to characterize the pore structures.
RESULTSThe SEM results indicated that the interparticle pores (300-600nm) and micro-fractures were the main reservoir space of the seventh member of Yanchang Formation shale gas. Most of the micro-fractures were formed by the precipitation of clay minerals and presented as a flat shape, which likely caused collapse of borehole walls. Organic pores were less developed and mainly associated with organic clay minerals. The micro X-ray microscopy showed that the seventh member of Yanchang Formation shale had laminated structures at micro-scale with organic matter laminations of 10-20μm in thickness. The results indicated that the seventh member shale had strong plasticity, which was against horizontal fracturing.
CONCLUSIONSThe results can provide significant data support for developing a percolation model and improving fracturing technology of shale gas.
- micro X-ray microscopy,
- Ar-ion milling,
- micro-nano pores,
- three dimensional structures,
- laminated textures,
- Terrestrial Yanchang Formation shale

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Investigation on Pore Structures of Yanchang Formation Shale Using Micro X-ray Microscopy

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