Pore structure and fractal analysis of shale oil reservoirs: A case study of the Paleogene Shahejie Formation in the Dongying Depression, Bohai Bay, China

2019 ◽  
Vol 177 ◽  
pp. 711-723 ◽  
Author(s):  
Huijun Wang ◽  
Wei Wu ◽  
Tao Chen ◽  
Jing Yu ◽  
Jienan Pan
Keyword(s):  
Pore Structure ◽  
Fractal Analysis ◽  
Oil Reservoirs ◽  
Bohai Bay ◽  
Shale Oil ◽  
Dongying Depression ◽  
Shahejie Formation ◽  
Shale Oil Reservoirs

scholarly journals Characteristics of micro- and nano-pores in shale oil reservoirs

2020 ◽  
Author(s):  
Debin Xia ◽  
Zhengming Yang ◽  
Tiening Gao ◽  
Haibo Li ◽  
Wei Lin
Keyword(s):  
Fractal Dimension ◽  
Pore Structure ◽  
Oil And Gas ◽  
Fractal Theory ◽  
Oil Reservoirs ◽  
Practical Significance ◽  
Oil Reservoir ◽  
Shale Oil ◽  
Structure Characteristics ◽  
Shale Oil Reservoirs

Abstract Porosity is the most common form of reservoirs, and its size, shape, and connectivity directly affect the capacity of oil and gas storage and production. To study the micro–nano-pore structure characteristics of shale oil reservoirs and quantitatively characterize its heterogeneity, this work uses high-precision high-pressure mercury intrusion (HPMI) experimental techniques to study the micro–nano-pore structure characteristics of shale oil, and based on the experimental data, fractal theory is used to quantitatively characterize its heterogeneity. The results of the study show that the micro–nano-pores in the shale oil reservoir are concentrated and continuous, and the pore radius is mainly distributed among the range of 30–500 nm, nanoscale pores are an important part of the pores of the shale oil reservoir. The fractal dimension of the shale oil reservoir is larger than the fractal dimension of typical tight oil reservoirs, indicating that the heterogeneity of shale oil reservoir is stronger. The research results have some theoretical and practical significance for the production of inter-salt shale oil reservoirs.

scholarly journals Integrating SANS and fluid-invasion methods to characterize pore structure of typical American shale oil reservoirs

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Jianhua Zhao ◽  
Zhijun Jin ◽  
Qinhong Hu ◽  
Zhenkui Jin ◽  
Troy. J. Barber ◽  
...  
Keyword(s):  
Pore Structure ◽  
Oil Reservoirs ◽  
Shale Oil ◽  
Shale Oil Reservoirs ◽  
Typical American

scholarly journals A workflow for flow simulation in shale oil reservoirs: A case study in woodford shale

2021 ◽  
Vol 5 (4) ◽  
pp. 365-375
Author(s):  
Mohammad Sharifi ◽  
Mohan Kelkar ◽  
Abdorreza Karkevandi-Talkhooncheh
Keyword(s):  
Flow Simulation ◽  
Oil Reservoirs ◽  
Shale Oil ◽  
Woodford Shale ◽  
Shale Oil Reservoirs

scholarly journals Pore Structure and Fractal Character of Lacustrine Oil-Bearing Shale from the Dongying Sag, Bohai Bay Basin, China

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-19
Author(s):  
Pengfei Zhang ◽  
Shuangfang Lu ◽  
Zhiping Zeng ◽  
Xiangchun Chang ◽  
Junqian Li ◽  
...  
Keyword(s):  
Pore Structure ◽  
Fractal Dimensions ◽  
Nitrogen Adsorption ◽  
Bohai Bay ◽  
Shale Oil ◽  
Bohai Bay Basin ◽  
Average Pore ◽  
Dongying Sag ◽  
Shahejie Formation ◽  
Fractal Character

To better understand the pore structure and fractal character of lacustrine shales and their influence on liquid hydrocarbon occurrences, in this study, a total of 29 lacustrine oil-bearing shale samples collected from the Shahejie Formation in the Dongying Sag, Bohai Bay Basin, were investigated based on nitrogen adsorption (NGA) analysis combined with TOC, Rock-Eval pyrolysis, X-ray diffraction (XRD), and field emission-scanning electron microscopy (FE-SEM) experiments. The relationships among the compositions (TOC, minerals, and oil content), pore structures, and fractal dimensions of the lacustrine shale samples were discussed. The results showed that the adsorption and fractal characteristics of lacustrine oil-bearing shales differ at relative pressures of 0-0.1 and 0.5-1. Two corresponding fractal dimensions D 1 and D 2 were determined by the FHH model according to the nitrogen adsorption branches. Specifically, D 1 varies from 2.4292 to 2.6109 (mean 2.5245), and D 2 varies between 2.4680 and 2.8535 (mean 2.6889). The specific surface area (SSA) ranges from 1.512 m2/g to 34.002 m2/g, with an average of 13.656 m2/g, the total pore volume is between 6.0 × 10-3 cm3/g and 48.4 × 10-3 cm3/g (mean 24.5 × 10-3 cm3/g), and the average pore diameter is in the range of 4.22 nm to 19.57 nm (mean 9.35 nm). Both D 1 and D 2 increase with increasing SSA and increase with decreasing average pore diameters but have no correlation with pore volume. Moreover, D 1 and D 2 exhibit positive relationships with clay minerals and negative correlations with carbonate minerals (calcite and dolomite). The relationship between fractal dimensions ( D 1 and D 2 ) and TOC contents is expressed as a U-shaped curve, characterized by the minimum D values at approximately 3% TOC. The shale oil content is controlled by the pore structures and fractal dimensions, and lacustrine shales with lower SSAs and smaller fractal dimensions would have more free oil. Therefore, lacustrine shales in the oil window with TOC contents ranging from 2% to 4% are probably the preferred shale oil exploration target in the Shahejie Formation, Dongying Sag, Bohai Bay Basin. The results indicate that fractal analysis can provide insight into the pore structure characteristics and oil storage capacity of lacustrine shales.

Research on Micro Pore Structure of the Shale Oil Reservoirs in Xingouzui Formation in the Jianghan Basin

2015 ◽  
Vol 89 (s1) ◽  
pp. 37-38
Author(s):  
Ying HU ◽  
Shuangfang LU ◽  
Wenhao LI ◽  
Pengfei ZHANG ◽  
Qian LI ◽  
...  
Keyword(s):  
Pore Structure ◽  
Oil Reservoirs ◽  
Shale Oil ◽  
Jianghan Basin ◽  
Shale Oil Reservoirs
Sign in / Sign up

Export Citation Format

Share Document