Characterization of the Pore Structure of the Wulalik Shale in the Majiatan Area of the Ordos Basin

DOI

10.2991/978-94-6463-606-2_25How to use a DOI?

Keywords

shale rock; Micron CT; Characterization of pore structure; Majiatan area

Abstract

Analyzing the nanopore structure of organic matter-rich shale is the basis for evaluating shale reservoir properties and the potential for shale gas resource exploration and development. In this paper, we evaluate the pore characteristics and connectivity of the shale of the Lower Paleozoic Ordovician Wulalik Formation at the western margin of the Ordos Basin by field-emission scanning electron microscopy, micrometer CT and three-dimensional reconstruction techniques: (1) Micron CT can show the three-dimensional spatial structure of shale pores, which is more conducive to characterizing shale pores in combination with other experimental methods; (2)The marine shale of Ordos Basin Western Ordovician Wulalik Formation is more developed in overall porosity. Through the observation of the samples, it is found that many dissolution holes and microcracks are developed in the shale, and the overall porosity is better developed, with large pore space and good connectivity, and a larger amount of pyrite can be seen; (3) The pore size of the marine shale of the Ordovician Wulalik Formation in the western Ordos Basin ranges from 1 to 45 μm, with 3 to 15 μm dominating, and the total pore volume of the shale is mainly provided by relatively small pores below 20 μm; (4) The poor connectivity of the study area may be due to the low thermal evolution of the shale in the study area and the limitation of micron CT accuracy.

Copyright

© 2024 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Xi Li
AU  - Wenyi Sun
AU  - Weiwei Yang
AU  - Junxiang Nan
PY  - 2024
DA  - 2024/12/24
TI  - Characterization of the Pore Structure of the Wulalik Shale in the Majiatan Area of the Ordos Basin
BT  - Proceedings of the 2024 6th International Conference on Civil Engineering, Environment Resources and Energy Materials (CCESEM 2024)
PB  - Atlantis Press
SP  - 215
EP  - 231
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-606-2_25
DO  - 10.2991/978-94-6463-606-2_25
ID  - Li2024
ER  -