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Understanding oil and gas production from low-permeability sandstones requires an understanding of the porosity. This paper reviews the analysis of data from hundreds of cores' microscopic pore characteristics of low-permeability sandstone reservoirs from Chang 6 reservoir of Ji-yuan oilfield in ordos basin. And this paper is to embody the methods used in the study of low permeable sandstone reservoir in recent years and the results reflected in it. For example, by analyzing the rock of Chang 6 reservoirs, it can be seen that the rock of Chang 6 reservoirs is mostly developed by Feldspar Sandstone, its internal pore types are diverse, the pore size is mainly small pore type, the second is fine pore, and has continuous spectral distribution, and the distribution is single peak shape. Different methods have been used to study low-permeability sandstones, including scanning electron microscope, casting thin plate, physical test means, high-pressure mercury, constant velocity mercury, NMR experiments. The results show that the pore-throat combination types of reservoir are mainly small pore-micro-larynx. The main type of reservoir throat is mainly flaky throat. The extremely strong heterogeneity in the layer is the key to the efficiency and effect of water flooding. Therefore, the exploration and development of low permeable sandstone reservoirs can be guided by the analysis of relevant parameters.


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Recent advances on microscopic pore characteristics of low permeability sandstone reservoirs

Show Author's information Shengyu Huang1( )Yiying Wu2,3Xiaobo Meng4Liwen Liu5Wei Ji6
No. 8 Oil Production Plant, PetroChina Changqing Oilfield Company, Xi'an 710018, P. R. China
State Key Laboratory of Continental Dynamics of Ministry of Geology, Northwest University, Xi'an 710069, P. R. China
Department of Geology, Northwest University, Xi'an 710069, P. R. China
Unconventional Natural Gas Institute, China University of Petroleum, Beijing 102249, P. R. China
Korla Branch of Bureau of Geophysical Prospecting Co., Ltd., CNPC, Korla 841001, P. R. China
Changqing Division of China Petroleum Group logging Co., Ltd., Xi'an 710201, P. R. China

Abstract

Understanding oil and gas production from low-permeability sandstones requires an understanding of the porosity. This paper reviews the analysis of data from hundreds of cores' microscopic pore characteristics of low-permeability sandstone reservoirs from Chang 6 reservoir of Ji-yuan oilfield in ordos basin. And this paper is to embody the methods used in the study of low permeable sandstone reservoir in recent years and the results reflected in it. For example, by analyzing the rock of Chang 6 reservoirs, it can be seen that the rock of Chang 6 reservoirs is mostly developed by Feldspar Sandstone, its internal pore types are diverse, the pore size is mainly small pore type, the second is fine pore, and has continuous spectral distribution, and the distribution is single peak shape. Different methods have been used to study low-permeability sandstones, including scanning electron microscope, casting thin plate, physical test means, high-pressure mercury, constant velocity mercury, NMR experiments. The results show that the pore-throat combination types of reservoir are mainly small pore-micro-larynx. The main type of reservoir throat is mainly flaky throat. The extremely strong heterogeneity in the layer is the key to the efficiency and effect of water flooding. Therefore, the exploration and development of low permeable sandstone reservoirs can be guided by the analysis of relevant parameters.

Keywords: NMR, mercury, low permeability, Microscopic pore characteristics, sandstone

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Publication history

Received: 18 February 2018
Revised: 05 March 2018
Accepted: 06 March 2018
Published: 10 March 2018
Issue date: June 2018

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© The Author(s) 2018

Acknowledgements

This work was supported by the Natural Science Foundation Research Project of Shaanxi Province (2016JQ4022) and the Shaanxi Province Science and Technology Co-ordination and Innovation Engineering Project (2011KTZB01-04-01). The authors sincerely thank the Changqing Oilfield Company of PetroChina Co. Ltd. for providing the drill cores used in this study.

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