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Fractal characteristics of pore-throat structure and permeability estimation of tight sandstone reservoirs: A case study of Chang 7 of the Upper Triassic Yanchang Formation in Longdong area, Ordos Basin, China
Guo, Ruiliang1,2; Xie, Qichao3,4; Qu, Xuefeng3,4; Chu, Meijuan3; Li, Shutong1; Ma, Dongxu5; Ma, Xiaofeng1,6
2020
Source PublicationJOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
ISSN0920-4105
Volume184Pages:13
AbstractPermeability estimation and quantitative evaluation of pore microstructure have always been hotspots and difficulties in tight sandstone reservoirs research. Taking the fractal dimension as the breakthrough, 10 core samples of Chang 7 section in the Upper Triassic Yanchang Formation were collected from different wells in Longdong area of Ordos Basin. The fractal dimension was calculated by mercury intrusion capillary pressure curve which can be obtained from high pressure mercury injection experiment, and samples were divided into four groups as group I, II, III and IV according to the value of fractal dimension estimated. The observation of casting thin sections and field emission scanning electron microscope show that group I mainly has dissolved-intergranular pores and original intergranular pores, group II is mainly dissolved-intergranular pores, group III mainly has dissolved-intragranular pores, and group IV is mainly micropores in clay matrix. Meanwhile, there is a highly correlation between the fractal dimension and the reservoir physical properties. With the fractal dimension of tight sandstone samples approaching 3, the compaction and cementation show a gradual increase, while the pore sorting, physical parameters and percolation capacity display a gradual decrease. Through multiple regression analysis, a set of empirical equations based on the fractal dimension and different pore throat radius were constructed, in which the equation based on maximum permeability contribution radius has the highest correlation. It shows that micropore (0.1-0.2 mu m) contributes most to permeability in tight sandstone reservoir. 10 blind samples were included in regression analysis to improve the prediction accuracy of the new model. A total of 28 samples, including 8 referenced data, were used to verify the predictive accuracy of the new model. The new empirical equation can predict the permeability of tight sandstone relatively accurate. Thus, the fractal dimension can effectively predict the permeability and evaluate the quality of tight sandstone reservoirs.
KeywordFractal dimension Tight sandstone reservoirs Yanchang Formation Permeability estimation Mercury intrusion capillary pressure
DOI10.1016/j.petrol.2019.106555
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Technological Research and Application Projects for Sustainable and Stable Production of 50 million tons in Changqing Oilfield ; Key Technological Research and Application Projects for Sustainable and Stable Production of 50 million tons in Changqing Oilfield ; Lanzhou City University Doctoral Research Initiation Fund ; Lanzhou City University Doctoral Research Initiation Fund ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Technological Research and Application Projects for Sustainable and Stable Production of 50 million tons in Changqing Oilfield ; Key Technological Research and Application Projects for Sustainable and Stable Production of 50 million tons in Changqing Oilfield ; Lanzhou City University Doctoral Research Initiation Fund ; Lanzhou City University Doctoral Research Initiation Fund ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Technological Research and Application Projects for Sustainable and Stable Production of 50 million tons in Changqing Oilfield ; Key Technological Research and Application Projects for Sustainable and Stable Production of 50 million tons in Changqing Oilfield ; Lanzhou City University Doctoral Research Initiation Fund ; Lanzhou City University Doctoral Research Initiation Fund ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Technological Research and Application Projects for Sustainable and Stable Production of 50 million tons in Changqing Oilfield ; Key Technological Research and Application Projects for Sustainable and Stable Production of 50 million tons in Changqing Oilfield ; Lanzhou City University Doctoral Research Initiation Fund ; Lanzhou City University Doctoral Research Initiation Fund
WOS KeywordCAPILLARY-PRESSURE ; OIL ; POROSITY ; MICROGEOMETRY ; EXPLORATION ; PARAMETERS ; INSIGHT ; IMPACT ; SHALES
Language英语
Funding ProjectNational Natural Science Foundation of China[41772142] ; National Natural Science Foundation of China[41802160] ; Key Technological Research and Application Projects for Sustainable and Stable Production of 50 million tons in Changqing Oilfield[2016E-05] ; Lanzhou City University Doctoral Research Initiation Fund[LZCU-BS2018-12]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Technological Research and Application Projects for Sustainable and Stable Production of 50 million tons in Changqing Oilfield ; Key Technological Research and Application Projects for Sustainable and Stable Production of 50 million tons in Changqing Oilfield ; Lanzhou City University Doctoral Research Initiation Fund ; Lanzhou City University Doctoral Research Initiation Fund ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Technological Research and Application Projects for Sustainable and Stable Production of 50 million tons in Changqing Oilfield ; Key Technological Research and Application Projects for Sustainable and Stable Production of 50 million tons in Changqing Oilfield ; Lanzhou City University Doctoral Research Initiation Fund ; Lanzhou City University Doctoral Research Initiation Fund ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Technological Research and Application Projects for Sustainable and Stable Production of 50 million tons in Changqing Oilfield ; Key Technological Research and Application Projects for Sustainable and Stable Production of 50 million tons in Changqing Oilfield ; Lanzhou City University Doctoral Research Initiation Fund ; Lanzhou City University Doctoral Research Initiation Fund ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Technological Research and Application Projects for Sustainable and Stable Production of 50 million tons in Changqing Oilfield ; Key Technological Research and Application Projects for Sustainable and Stable Production of 50 million tons in Changqing Oilfield ; Lanzhou City University Doctoral Research Initiation Fund ; Lanzhou City University Doctoral Research Initiation Fund
WOS Research AreaEnergy & Fuels ; Engineering
WOS SubjectEnergy & Fuels ; Engineering, Petroleum
WOS IDWOS:000501599800067
PublisherELSEVIER
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/95823
Collection兰州油气中心
Corresponding AuthorGuo, Ruiliang; Ma, Xiaofeng
Affiliation1.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.PetroChina Changqing OilField Co, Xian 710018, Shaanxi, Peoples R China
4.Natl Engn Lab Explorat & Dev Low Permeabil Oil &, Xian 710018, Shaanxi, Peoples R China
5.Lanzhou City Univ, Peili Petr Engn Coll, Lanzhou 730070, Gansu, Peoples R China
6.China Univ Geosci, Key Lab Tecton & Petr Resources, Wuhan 430074, Hubei, Peoples R China
Recommended Citation
GB/T 7714
Guo, Ruiliang,Xie, Qichao,Qu, Xuefeng,et al. Fractal characteristics of pore-throat structure and permeability estimation of tight sandstone reservoirs: A case study of Chang 7 of the Upper Triassic Yanchang Formation in Longdong area, Ordos Basin, China[J]. JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING,2020,184:13.
APA Guo, Ruiliang.,Xie, Qichao.,Qu, Xuefeng.,Chu, Meijuan.,Li, Shutong.,...&Ma, Xiaofeng.(2020).Fractal characteristics of pore-throat structure and permeability estimation of tight sandstone reservoirs: A case study of Chang 7 of the Upper Triassic Yanchang Formation in Longdong area, Ordos Basin, China.JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING,184,13.
MLA Guo, Ruiliang,et al."Fractal characteristics of pore-throat structure and permeability estimation of tight sandstone reservoirs: A case study of Chang 7 of the Upper Triassic Yanchang Formation in Longdong area, Ordos Basin, China".JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING 184(2020):13.
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