Study on Pore Structure and Quantitative Parameters of the Paleocene-Cretaceous Sandstone Reservoir in Jiangling Depression by SEM and Mercury Injection Method

Peng-rui CAI; Chun-lian WANG; Cheng-lin LIU; Fei YANG; Hai-ming XU; Teng-xiao XIE; Xiao-can YU; Ling-yang MENG

doi:10.15898/j.cnki.11-2131/td.2017.02.008

2017 Vol. 36, No. 2

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Peng-rui CAI, Chun-lian WANG, Cheng-lin LIU, Fei YANG, Hai-ming XU, Teng-xiao XIE, Xiao-can YU, Ling-yang MENG. Study on Pore Structure and Quantitative Parameters of the Paleocene-Cretaceous Sandstone Reservoir in Jiangling Depression by SEM and Mercury Injection Method[J]. Rock and Mineral Analysis, 2017, 36(2): 146-155. doi: 10.15898/j.cnki.11-2131/td.2017.02.008

Citation:

Peng-rui CAI, Chun-lian WANG, Cheng-lin LIU, Fei YANG, Hai-ming XU, Teng-xiao XIE, Xiao-can YU, Ling-yang MENG. Study on Pore Structure and Quantitative Parameters of the Paleocene-Cretaceous Sandstone Reservoir in Jiangling Depression by SEM and Mercury Injection Method[J]. Rock and Mineral Analysis, 2017, 36(2): 146-155. doi: 10.15898/j.cnki.11-2131/td.2017.02.008

Study on Pore Structure and Quantitative Parameters of the Paleocene-Cretaceous Sandstone Reservoir in Jiangling Depression by SEM and Mercury Injection Method

1.
Academy of Geophysics and Oil Resource, Yangtze University, Wuhan 430100, China
2.
Key Laboratory of Metallogeny and Mineral Assessment, Ministry of Land and Resources, Institute of Mineral Resource, Chinese Academy of Geological Sciences, Beijing 100037, China
3.
Beijing Institute of Technology, Beijing 100081, China
4.
School of the Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China

More Information

Corresponding author: Chun-lian WANG, wangchunlian312@163.com

Received Date: 08 April 2016

Revised Date: 26 February 2017

Accepted Date: 20 March 2017

Abstract

Abstract

Evaluating reservoirs by pore structure has been widely used in oil and gas development, but this method has not yet been used in the evaluation of potassium salt reservoirs. The pore throat type and structure, capillary pressure curve, and quantitative feature parameters of pore throat of the Paleocene-Cretaceous-rich potassium-rich brine reservoir in Jianghan basin are studied by using a large number of reservoir porosity and pore throat data obtained by Scanning Electron Microscopy and Mercury Intrusion. Combined with the discharge pressure and other experimental parameters, the pore structure is divided into Ⅰ, Ⅱ, and Ⅲ types. The results show that the sandstone reservoirs of the Paleocene Shashi Formation are dominated by type Ⅱ pore structure with the average displacement pressure of 2.72 MPa and the average porosity of 6.32%. The sandstone reservoirs of the Cretaceous Honghuatao Formation are dominated by Ⅰ and Ⅱ pore structure types. The displacement pressure of type Ⅰ is 0.28 MPa, the average porosity is 16.99%, and the permeability is 87.79×10^-3 μm². The average displacement pressure of type Ⅱ is 1.103 MPa, the average porosity is 10.02%, and the permeability is 18.83×10^-3 μm². The quality of the reservoir was evaluated by a comprehensive analysis of pore throat quantitative parameters such as maximum mercury saturation, maximum pore throat radius, median radius and mercury recovery efficiency. It is believed that the sandstone type of the Paleocene Shashi Formation is dominated by siltstone, and the quality of the reservoir is poor, which belongs to the low porosity and low permeability reservoir. The sandstone type of the Cretaceous Honghuatao Formation is mainly fine sandstone, and the reservoir is of good quality and belongs to low porosity and low permeability reservoir. This study provides a reliable geological basis for the evaluation of potassium-rich brine reservoirs and for further exploration and development.
- Jiangling Depression /
- sylvite /
- capillary pressure curve /
- pore structure parameter /
- reservoir property /
- correlation model

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References

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