Multi−scale characterization of shale pore structure of Niutitang Formation in southeastern Guizhou and its influence on shale gas enrichment

GE Mingna; BAO Shujing; SHI Dishi; MA Yong; ZHANG Jinchuan; ZHANG Qin; ZHANG Liqin; LIN Yanhua; WANG Ting

doi:10.12029/gc20210923001

2024 Vol. 51, No. 1

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Article navigation > Geology in China > 2024 > 51(1): 57-72

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GE Mingna, BAO Shujing, SHI Dishi, MA Yong, ZHANG Jinchuan, ZHANG Qin, ZHANG Liqin, LIN Yanhua, WANG Ting. 2024. Multi−scale characterization of shale pore structure of Niutitang Formation in southeastern Guizhou and its influence on shale gas enrichment[J]. Geology in China, 51(1): 57-72. doi: 10.12029/gc20210923001

Citation:

GE Mingna, BAO Shujing, SHI Dishi, MA Yong, ZHANG Jinchuan, ZHANG Qin, ZHANG Liqin, LIN Yanhua, WANG Ting. 2024. Multi−scale characterization of shale pore structure of Niutitang Formation in southeastern Guizhou and its influence on shale gas enrichment[J]. Geology in China, 51(1): 57-72. doi: 10.12029/gc20210923001

Multi−scale characterization of shale pore structure of Niutitang Formation in southeastern Guizhou and its influence on shale gas enrichment

1.
Oil and Gas Survey, China Geological Survey, Beijing 100083, China
2.
National Key Laboratory for Multi-resource Collaborated Green Development of Continental Shale Oil, Daqing 163712, Heilongjiang, China
3.
China University of Petroleum, Beijing 102249, China
4.
China University of Geosciences, Beijing 100083, China
5.
PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China

Fund Project: Supported by National Science and Technology Major Project "Shale gas resource evaluation methods and exploration techniques" (No. 2016ZX05034), National Natural Science Foundation of China (No. 42130803) and the project of China Geological Survey (No. DD20230257).

More Information

Author Bio: GE Mingna, female, born in 1988, master, senior engineer, mainly engaged in the unconventional oil and gas geological study; E-mail: 610144368@qq.com
Corresponding author: BAO Shujing, male, born in 1964, master, professor of engineering, mainly engaged in oil and gas geology; E-mail: 415530248@qq.com.

Received Date: 23 September 2021

Revised Date: 05 January 2022

Publish Date: 25 January 2024

Abstract

Abstract

This paper is the result of oil and gas exploration engineering.
Objective
It is necessary to study the pore structure characteristics of Niutitang Formation shale in Southeast Guizhou and its influence on shale gas enrichment, avoid unfavorable factors, and provide suggestions for shale gas exploration in Southeast Guizhou.
Methods
Multi−scale characterization of the shale micro−nano pore structure is carried out by means of focused ion beam scanning electron microscopy (FIB−SEM), FE−SEM, and nitrogen adsorption. Combined with the hydrocarbon generation and burial history of the Niutitang Formation shale in the study area, the relationship between tectonic movement and pore structure is studied, and its control effect on shale gas enrichment is analyzed.
Results
The Niutitang Formation shale mainly develops millimeter−scale micro−cracks, micron−scale pyrite intercrystalline pores and nano−scale organic pores, mainly ink bottle−shaped pores and slit pores with a flat plate structure, and the pore structure is complex. Combined with the results of FIB−SEM three−dimensional reconstruction, organic matter accounts for a relatively high proportion of shale, with a porosity of 0.04%−2.48% and a contribution rate of 14%−96% to the total porosity. The pyrite crystals co−existing with organic matter Pores are the main type of pores that communicate fractures, the shale gas in this area is dominated by undersaturated adsorbed gas, and the free gas content is low.
Conclusions
A large number of structural fractures in the Niutitang Formation shale have connected organic matter pores and pyrite intercrystalline pores, and changed the original pore structure, causing the in−situ accumulated shale gas to escape along the fractures, which is a key factor in the low gas content of the shale of the Niutitang Formation. Finding areas with moderate thermal evolution and well−preserved structures is a favorable direction for shale gas exploration on the periphery of paleo−uplifts.
- shale gas /
- pore structure /
- three−dimensional reconstruction /
- periphery of paleo−uplift /
- preservation conditions /
- oil and gas exploration engineering /
- Southeast Guizhou

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References

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