Study on Porosity Measurement Determination Methods of a Shale Reservoir in the Longmaxi Formation, Sichuan Basin

WENG Jianqiao; LI Xiawei; QI Minghui; ZHANG Yeyu; WANG Yu; ZHANG Wei

doi:10.15898/j.cnki.11-2131/td.202012270173

Rock and Mineral Analysis > 2022 > 41(4): 598-605. > DOI: 10.15898/j.cnki.11-2131/td.202012270173

WENG Jianqiao, LI Xiawei, QI Minghui, ZHANG Yeyu, WANG Yu, ZHANG Wei. Study on Porosity Measurement Determination Methods of a Shale Reservoir in the Longmaxi Formation, Sichuan Basin[J]. Rock and Mineral Analysis, 2022, 41(4): 598-605. DOI: 10.15898/j.cnki.11-2131/td.202012270173

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Study on Porosity Measurement Determination Methods of a Shale Reservoir in the Longmaxi Formation, Sichuan Basin

WENG Jianqiao^{1, 2, 3,},
LI Xiawei^{1, 2, 3},
QI Minghui^{1, 2, 3},
ZHANG Yeyu^{1, 2, 3},
WANG Yu^{1, 2, 3},
ZHANG Wei^{1, 4}

1.
Shale Gas Evaluation and Exploitation Key Laboratory of Sichuan Province, Chengdu 610091, China
2.
Technology Innovation Center of Shale Gas Exploration and Development in Complex Structural Areas, Ministry of Natural Resources, Chengdu 610091, China
3.
Sichuan Keyuan Testing Center of Engineering Technology, Chengdu 610091, China
4.
Institute of Exploration and Development, PetroChina Southwest Oil and Gas Field Company, Chengdu 610213, China

More Information

Received Date: December 26, 2020
Revised Date: April 12, 2021
Accepted Date: February 22, 2022
Available Online: September 08, 2022

Abstract

HIGHLIGHTS
(1) Shale reservoirs in the Longmaxi Formation have high clay content and abundant small organic pores. Pressurized saturation process of extraneous liquid leads to deviated porosity results.

(2) Shale samples can be dried to a constant weight under 60℃. Bond water and structure water in clay minerals will be removed under higher temperature, thus damaging the pore structure.

(3) Settling time of helium porosity measurement is suggested to exceed the needed balance time. Higher inlet pressure helps accelerate the experiment process.

ABSTRACT

BACKGROUND
Porosity is a key parameter for exploration and evaluation of shale gas reservoirs. Rapid and accurate determination of shale porosity is crucial for reserve calculation. At present, there are helium gas method, liquid saturation method and image analysis method applied to shale porosity determination, but the comparison between methods and laboratories is lacking.
OBJECTIVES
To evaluate the applicability of different methods for determining shale porosity.
METHODS
The characteristics of 69 shale samples from the Longmaxi Formation were studied by analyzing and testing techniques such as X-ray diffraction, argon ion polishing-scanning electron microscopy, and mercury injection-nitrogen adsorption method. Comparison experiments for porosity measurement were conducted among helium method, liquid saturation method and image analysis method.
RESULTS
The Longmaxi Formation shale had high clay content, many organic pores, small pore throats, and poor seepage capacity, which made it difficult for foreign liquids and gases to quickly enter the pores, which required high resolution of core image data. The liquid saturation method (alcohol method) used 20MPa pressure to saturate the sample for 24 hours, resulting in core damage, and the measured porosity deviated from the true value. The image analysis method ignored the micropores (pore size < 2nm) and mesopores (pore size < 50nm) in the mineral matrix and other factors, making the porosity measurement result unreliable. The porosity measurement result of the helium method was closely related to the drying temperature and stabilization time. The higher the temperature, the larger the measured porosity, and if the stabilization time is too short, the porosity result will be smaller than the real values.
CONCLUSIONS
After drying the core at 60℃ for more than 24 hours to a constant weight, by setting a reasonable stabilization time, accurate porosity results can be obtained by the helium method. Properly increasing the injection pressure helps to speed up the experimentation rate.
- shale porosity,
- nitrogen adsorption,
- sample damage,
- helium method,
- drying temperature,
- settling time

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References

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Study on Porosity Measurement Determination Methods of a Shale Reservoir in the Longmaxi Formation, Sichuan Basin

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