Method of Calculating Secondary Porosity of Reef Limestone Reservoir by Casting Thin Section Calibrating Nuclear Magnetic T2 Spectrum
Secondary pores are the main reservoir space and transportation channel of oil and gas in reef limestone reservoir. At present, the main method of calculating secondary porosity is restricted by the morphological characteristics of porosity spectrum, regional artificial influence, and accuracy of ca...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2021/6647072 |
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| author | Bin Zhao Zhaoping Li Chuqiao Gao Guoyi Zhang Jinbo Wu Gang Gao Yang Tang |
| author_facet | Bin Zhao Zhaoping Li Chuqiao Gao Guoyi Zhang Jinbo Wu Gang Gao Yang Tang |
| author_sort | Bin Zhao |
| collection | DOAJ |
| description | Secondary pores are the main reservoir space and transportation channel of oil and gas in reef limestone reservoir. At present, the main method of calculating secondary porosity is restricted by the morphological characteristics of porosity spectrum, regional artificial influence, and accuracy of calculation. We present a new method for calculating secondary porosity of reef limestone reservoir by the nuclear magnetic resonance T2 spectrum which is calibrated by casting thin section. We begin with analyzing and determining the high correlation between the surface porosity of casting thin section and the total porosity. The objective is confirming the feasibility of the method of calculating secondary porosity by using thin-section information calibrate. Then, we use the surface porosity of thin section as the calibrating data and find the T2 relaxation time corresponding to the best correlation between the secondary porosity and the secondary surface porosity of casting thin section, that is, the T2 cutoff value of secondary porosity, through the Monte Carlo method. Finally, we calculate the secondary porosity by using the functional relationship between the secondary surface porosity and the surface porosity. The statistical analysis shows that the method of calculating secondary porosity effectively improves the calculation accuracy of secondary porosity. The secondary porosity calculation results have a high correlation with the reservoir productivity. |
| format | Article |
| id | doaj-art-38d8ba761a024d0bbd431b2574345b91 |
| institution | Kabale University |
| issn | 1468-8115 1468-8123 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-38d8ba761a024d0bbd431b2574345b912025-02-03T06:05:43ZengWileyGeofluids1468-81151468-81232021-01-01202110.1155/2021/66470726647072Method of Calculating Secondary Porosity of Reef Limestone Reservoir by Casting Thin Section Calibrating Nuclear Magnetic T2 SpectrumBin Zhao0Zhaoping Li1Chuqiao Gao2Guoyi Zhang3Jinbo Wu4Gang Gao5Yang Tang6Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Yangtze University, Wuhan Hubei, ChinaCollege of Geophysics and Oil Resources, Yangtze University, Wuhan Hubei, ChinaCollege of Geophysics and Oil Resources, Yangtze University, Wuhan Hubei, ChinaResearch Institute of Petroleum Exploration and Development, Jilin Oil & Gas Field Branch, PetroChina, Songyuan, ChinaZhanjiang Branch, CNOOC Energy Technology & Services Co., Zhanjiang, ChinaCollege of Geophysics and Oil Resources, Yangtze University, Wuhan Hubei, ChinaCollege of Geophysics and Oil Resources, Yangtze University, Wuhan Hubei, ChinaSecondary pores are the main reservoir space and transportation channel of oil and gas in reef limestone reservoir. At present, the main method of calculating secondary porosity is restricted by the morphological characteristics of porosity spectrum, regional artificial influence, and accuracy of calculation. We present a new method for calculating secondary porosity of reef limestone reservoir by the nuclear magnetic resonance T2 spectrum which is calibrated by casting thin section. We begin with analyzing and determining the high correlation between the surface porosity of casting thin section and the total porosity. The objective is confirming the feasibility of the method of calculating secondary porosity by using thin-section information calibrate. Then, we use the surface porosity of thin section as the calibrating data and find the T2 relaxation time corresponding to the best correlation between the secondary porosity and the secondary surface porosity of casting thin section, that is, the T2 cutoff value of secondary porosity, through the Monte Carlo method. Finally, we calculate the secondary porosity by using the functional relationship between the secondary surface porosity and the surface porosity. The statistical analysis shows that the method of calculating secondary porosity effectively improves the calculation accuracy of secondary porosity. The secondary porosity calculation results have a high correlation with the reservoir productivity.http://dx.doi.org/10.1155/2021/6647072 |
| spellingShingle | Bin Zhao Zhaoping Li Chuqiao Gao Guoyi Zhang Jinbo Wu Gang Gao Yang Tang Method of Calculating Secondary Porosity of Reef Limestone Reservoir by Casting Thin Section Calibrating Nuclear Magnetic T2 Spectrum Geofluids |
| title | Method of Calculating Secondary Porosity of Reef Limestone Reservoir by Casting Thin Section Calibrating Nuclear Magnetic T2 Spectrum |
| title_full | Method of Calculating Secondary Porosity of Reef Limestone Reservoir by Casting Thin Section Calibrating Nuclear Magnetic T2 Spectrum |
| title_fullStr | Method of Calculating Secondary Porosity of Reef Limestone Reservoir by Casting Thin Section Calibrating Nuclear Magnetic T2 Spectrum |
| title_full_unstemmed | Method of Calculating Secondary Porosity of Reef Limestone Reservoir by Casting Thin Section Calibrating Nuclear Magnetic T2 Spectrum |
| title_short | Method of Calculating Secondary Porosity of Reef Limestone Reservoir by Casting Thin Section Calibrating Nuclear Magnetic T2 Spectrum |
| title_sort | method of calculating secondary porosity of reef limestone reservoir by casting thin section calibrating nuclear magnetic t2 spectrum |
| url | http://dx.doi.org/10.1155/2021/6647072 |
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