{"title":"通过渗透率估算卤水饱和砂岩的附加电阻率","authors":"Wenjun Zhao, Tangyan Liu, Jizhou Tang, J. Zhang","doi":"10.1144/petgeo2022-067","DOIUrl":null,"url":null,"abstract":"\n Determining rock resistivity for saturation estimation in reservoirs is challenging due to the complex nature of pores in the rock. This paper aims to establish a computational relationship between formation factors (\n F\n ) and permeability (\n K\n ) by combining theoretical and experimental data. Firstly, the relationship between the permeability of the curved capillary model and formation factors, as well as the relationship between the permeability of the complex curved capillary model and formation factors, are deduced. Theoretical analysis proved that the formation factors(\n F\n ) have a power relationship with permeability(\n K\n ) and porosity (\n \n \n φ\n \n \n ), and confirms the existence of additional resistivity (\n \n R\n x\n \n ). To validate the the theoretical study, we conducted model analysis using open experimental data from thirty-five sandstone cores with different porosity and permeability from the tight gas sandstone in the Western U.S. Basins, which measured resistivity data in saline at 20ppm, 40ppm, and 80ppm, respectively. We confirmed the existences of additional resistivity (\n \n R\n x\n \n ) by fitting the relationship between the rock resistivity of saturated formation water (\n R\n o\n ) and the formation water resistivity (\n \n R\n w\n \n ). We then fitted the formation resistivity change factor (\n \n F\n d\n \n ) with permeability (\n K\n ), the formation resistivity change factor (\n \n F\n d\n \n ) with porosity (\n \n \n φ\n \n \n ), the additional resistivity (\n \n R\n x\n \n ) with permeability (\n K\n ), and the additional resistivity (\n \n R\n x\n \n ) with porosity (\n \n \n φ\n \n \n ). Both changeable formation resistivity change factor (\n \n F\n d\n \n ) and additional resistivity (\n \n R\n x\n \n ) showed a strong linear relationship with permeability (\n K\n ) in logarithmic coordinates.\n \n \n We also verified the existence of a suitable equation using available experimental data by changing formation parameters and permeability. The study shows that the fitting equations may be utilized to determine changeable formation resistivity change factor (\n \n F\n d\n \n ), additional resistivity (\n \n R\n x\n \n ), and the rock resistivity of saturated formation water (\n R\n o\n ) with varying permeability. The predicted rock resistivity of saturated formation water (\n R\n o\n ) strongly correlates with the one measured in the laboratory, providing better precision for future reservoir evaluation in saturation estimations.\n","PeriodicalId":49704,"journal":{"name":"Petroleum Geoscience","volume":null,"pages":null},"PeriodicalIF":1.9000,"publicationDate":"2023-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Estimating Additional Resistivity by Permeability in Brine Saturated Sandstones\",\"authors\":\"Wenjun Zhao, Tangyan Liu, Jizhou Tang, J. Zhang\",\"doi\":\"10.1144/petgeo2022-067\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"\\n Determining rock resistivity for saturation estimation in reservoirs is challenging due to the complex nature of pores in the rock. This paper aims to establish a computational relationship between formation factors (\\n F\\n ) and permeability (\\n K\\n ) by combining theoretical and experimental data. Firstly, the relationship between the permeability of the curved capillary model and formation factors, as well as the relationship between the permeability of the complex curved capillary model and formation factors, are deduced. Theoretical analysis proved that the formation factors(\\n F\\n ) have a power relationship with permeability(\\n K\\n ) and porosity (\\n \\n \\n φ\\n \\n \\n ), and confirms the existence of additional resistivity (\\n \\n R\\n x\\n \\n ). To validate the the theoretical study, we conducted model analysis using open experimental data from thirty-five sandstone cores with different porosity and permeability from the tight gas sandstone in the Western U.S. Basins, which measured resistivity data in saline at 20ppm, 40ppm, and 80ppm, respectively. We confirmed the existences of additional resistivity (\\n \\n R\\n x\\n \\n ) by fitting the relationship between the rock resistivity of saturated formation water (\\n R\\n o\\n ) and the formation water resistivity (\\n \\n R\\n w\\n \\n ). We then fitted the formation resistivity change factor (\\n \\n F\\n d\\n \\n ) with permeability (\\n K\\n ), the formation resistivity change factor (\\n \\n F\\n d\\n \\n ) with porosity (\\n \\n \\n φ\\n \\n \\n ), the additional resistivity (\\n \\n R\\n x\\n \\n ) with permeability (\\n K\\n ), and the additional resistivity (\\n \\n R\\n x\\n \\n ) with porosity (\\n \\n \\n φ\\n \\n \\n ). Both changeable formation resistivity change factor (\\n \\n F\\n d\\n \\n ) and additional resistivity (\\n \\n R\\n x\\n \\n ) showed a strong linear relationship with permeability (\\n K\\n ) in logarithmic coordinates.\\n \\n \\n We also verified the existence of a suitable equation using available experimental data by changing formation parameters and permeability. The study shows that the fitting equations may be utilized to determine changeable formation resistivity change factor (\\n \\n F\\n d\\n \\n ), additional resistivity (\\n \\n R\\n x\\n \\n ), and the rock resistivity of saturated formation water (\\n R\\n o\\n ) with varying permeability. The predicted rock resistivity of saturated formation water (\\n R\\n o\\n ) strongly correlates with the one measured in the laboratory, providing better precision for future reservoir evaluation in saturation estimations.\\n\",\"PeriodicalId\":49704,\"journal\":{\"name\":\"Petroleum Geoscience\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":1.9000,\"publicationDate\":\"2023-04-24\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Petroleum Geoscience\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://doi.org/10.1144/petgeo2022-067\",\"RegionNum\":4,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"GEOSCIENCES, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Petroleum Geoscience","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1144/petgeo2022-067","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}
Estimating Additional Resistivity by Permeability in Brine Saturated Sandstones
Determining rock resistivity for saturation estimation in reservoirs is challenging due to the complex nature of pores in the rock. This paper aims to establish a computational relationship between formation factors (
F
) and permeability (
K
) by combining theoretical and experimental data. Firstly, the relationship between the permeability of the curved capillary model and formation factors, as well as the relationship between the permeability of the complex curved capillary model and formation factors, are deduced. Theoretical analysis proved that the formation factors(
F
) have a power relationship with permeability(
K
) and porosity (
φ
), and confirms the existence of additional resistivity (
R
x
). To validate the the theoretical study, we conducted model analysis using open experimental data from thirty-five sandstone cores with different porosity and permeability from the tight gas sandstone in the Western U.S. Basins, which measured resistivity data in saline at 20ppm, 40ppm, and 80ppm, respectively. We confirmed the existences of additional resistivity (
R
x
) by fitting the relationship between the rock resistivity of saturated formation water (
R
o
) and the formation water resistivity (
R
w
). We then fitted the formation resistivity change factor (
F
d
) with permeability (
K
), the formation resistivity change factor (
F
d
) with porosity (
φ
), the additional resistivity (
R
x
) with permeability (
K
), and the additional resistivity (
R
x
) with porosity (
φ
). Both changeable formation resistivity change factor (
F
d
) and additional resistivity (
R
x
) showed a strong linear relationship with permeability (
K
) in logarithmic coordinates.
We also verified the existence of a suitable equation using available experimental data by changing formation parameters and permeability. The study shows that the fitting equations may be utilized to determine changeable formation resistivity change factor (
F
d
), additional resistivity (
R
x
), and the rock resistivity of saturated formation water (
R
o
) with varying permeability. The predicted rock resistivity of saturated formation water (
R
o
) strongly correlates with the one measured in the laboratory, providing better precision for future reservoir evaluation in saturation estimations.
期刊介绍:
Petroleum Geoscience is the international journal of geoenergy and applied earth science, and is co-owned by the Geological Society of London and the European Association of Geoscientists and Engineers (EAGE).
Petroleum Geoscience transcends disciplinary boundaries and publishes a balanced mix of articles covering exploration, exploitation, appraisal, development and enhancement of sub-surface hydrocarbon resources and carbon repositories. The integration of disciplines in an applied context, whether for fluid production, carbon storage or related geoenergy applications, is a particular strength of the journal. Articles on enhancing exploration efficiency, lowering technological and environmental risk, and improving hydrocarbon recovery communicate the latest developments in sub-surface geoscience to a wide readership.
Petroleum Geoscience provides a multidisciplinary forum for those engaged in the science and technology of the rock-related sub-surface disciplines. The journal reaches some 8000 individual subscribers, and a further 1100 institutional subscriptions provide global access to readers including geologists, geophysicists, petroleum and reservoir engineers, petrophysicists and geochemists in both academia and industry. The journal aims to share knowledge of reservoir geoscience and to reflect the international nature of its development.