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Reservoir properties and hydrocarbon charging threshold of Yanchang Formation tight sandstones in Fuxian area, Ordos Basin

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doi: 10.11781/sysydz20180288
Authors:Deng Yaren; Ren Zhanli; Ma Wenqiang; Chen Xipan; Yang Guilin; NANKA Ewu
Author Affiliations:Primary:
Shaanxi Provincial Land Engineering Construction Group, Xi'an, China
Northwest University, China
Shaanxi Yanchang Petroleum, China
Volume Title:Shiyou Shiyan Dizhi Petroleum Geology & Experiment
Source:Shiyou Shiyan Dizhi = Petroleum Geology & Experiment, 40(2), p.288-294. Publisher: Gai Kan Bian-Wei-Hui, Wuxi, Jiangsu, China. ISSN: 1001-6112
Publication Date:2018
Note:In Chinese with English summary. 37 refs.; illus., incl. 1 table, sketch map
Summary:Hydrocarbon charging threshold is the basis for tight oil accumulation research. The microstructure of Chang 8 tight sandstone reservoirs in the Fuxian area of Ordos Basin is very complicated, which is a key factor influencing hydrocarbon charging. Field emission scanning electron microscopy (SEM) and CT methods were used to quantitatively study the pore-throat characteristics of tight sandstone reservoirs. Mechanical properties, well logging and effective pore-throat analyses were used to determine the hydrocarbon charging threshold of physical properties and pore-throat characteristics. The results showed that the pore size of tight reservoirs is dominated by nanometer and submicron scale, and the average pore radius is 1.2µm. The average radius of throat is 0.1µm, which belongs to micropore-fine throat reservoirs. It was calculated that the charging threshold of porosity of Chang 8 tight sandstone reservoirs is 4.5%, and that of permeability is 0.04×10-3µm2. The threshold of pore-throat diameter on the source and reservoir interface is 15.77 nm, and that inside reservoir is 24 nm. We integrated that oil and gas might occur in nano-scale pores as oil bead, throat or thin film as compaction and cementation effects became stronger.
Subjects:Clastic rocks; Computed tomography data; Electron microscopy data; Mesozoic; Microstructure; Migration; Permeability; Petroleum; Petroleum accumulation; Petroleum exploration; Porosity; Reservoir rocks; Sandstone; Sedimentary rocks; SEM data; Triassic; Upper Triassic; Yanchang Formation; Asia; China; Far East; Ordos Basin; Shaanxi China; Fuxian China
Coordinates:N355929 N355929 E1092206 E1092206
Record ID:844822-20
Copyright Information:GeoRef, Copyright 2021 American Geosciences Institute.
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