PORE STRUCTURE OF TRANSITIONAL SHALES IN THE ORDOS BASIN, NW CHINA: EFFECTS OF COMPOSITION ON GAS STORAGE MECHANISM

2017 ◽  
Author(s):  
Fengyang Xiong ◽  
◽  
Zhenxue Jiang ◽  
Mohammad Amin Amooie ◽  
Mohamad Reza Soltanian ◽  
...  
Keyword(s):  
Pore Structure ◽  
Ordos Basin ◽  
Gas Storage ◽  
Nw China ◽  
Storage Mechanism ◽  
The Ordos Basin

Pore structure of transitional shales in the Ordos Basin, NW China: Effects of composition on gas storage capacity

Fuel ◽  
2017 ◽  
Vol 206 ◽  
pp. 504-515 ◽  
Author(s):  
Fengyang Xiong ◽  
Zhenxue Jiang ◽  
Peng Li ◽  
Xiangzeng Wang ◽  
He Bi ◽  
...  
Keyword(s):  
Pore Structure ◽  
Storage Capacity ◽  
Ordos Basin ◽  
Gas Storage ◽  
Nw China ◽  
The Ordos Basin

scholarly journals Opportunities in Measuring Multiscale Pore Structure of the Continental Shale of the Yanchang Formation, Ordos Basin, China

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5282
Author(s):  
Yanyan Li ◽  
Zhihong Zhang ◽  
Siyu Wei ◽  
Peng Yang ◽  
Yanjun Shang
Keyword(s):  
Pore Structure ◽  
Ordos Basin ◽  
Three Dimensional ◽  
Ct Scanning ◽  
Yanchang Formation ◽  
Storage Mechanism ◽  
Micro Scale ◽  
Nano Scale ◽  
Linear Relationships ◽  
The Ordos Basin

Pores of shale exhibit multiscale characteristics, and pore characterization is challenging due to the complexity of pore systems. Currently, research is focused on nano-submicron pores, but the structure of micrometer-scaled pores is not well understood. In this research, an investigation of the three-dimensional pore network of the Chang 7 shale in the Ordos Basin of China was conducted, in order to provide an insight into the full characteristics of pore systems. Nano-CT and micro-CT scanning technology was used to comprehensively delineate the pore structure at different scales, for further understanding the gas storage mechanism in shale rocks. Results show that the radius of micro-scale pores ranges from 1 to 15 μm, with an average of 2.8 μm, and pores with radii of 1–5 μm occupy approximately 90% of all the pores. For the nano-scale pores, the size ranges from 86 to 2679 nm, with an average of 152 nm, yet it has a rather concentrated distribution within 300 nm. The nano-scale pores constitute most of the pore amount in the shale, whereas the micro-scale pores constitute most of the pore volumes. Moreover, the results show that more than 70% of nano-scale pores in the Chang 7 shale are isolated pores, indicating that pore bodies formed in the shale reservoir have poor connectivity. Positive linear relationships between pore sizes and the number of pore throats at the micro-scale and nano-scale were both obtained, suggesting that larger pores tend to have better connectivity than smaller pores.

Insight into the Pore Structure of Tight Gas Sandstones: A Case Study in the Ordos Basin, NW China

2017 ◽  
Vol 31 (12) ◽  
pp. 13159-13178 ◽  
Author(s):  
Hao Wu ◽  
Youliang Ji ◽  
Ruie Liu ◽  
Chunlin Zhang ◽  
Sheng Chen
Keyword(s):  
Pore Structure ◽  
Ordos Basin ◽  
Tight Gas ◽  
Nw China ◽  
The Ordos Basin ◽  
Tight Gas Sandstones ◽  
Insight Into

Fractal Analysis of Shale Pore Structure of Continental Gas Shale Reservoir in the Ordos Basin, NW China

2016 ◽  
Vol 30 (6) ◽  
pp. 4676-4689 ◽  
Author(s):  
Fujie Jiang ◽  
Di Chen ◽  
Jian Chen ◽  
Qianwen Li ◽  
Ying Liu ◽  
...  
Keyword(s):  
Pore Structure ◽  
Fractal Analysis ◽  
Ordos Basin ◽  
Gas Shale ◽  
Nw China ◽  
The Ordos Basin ◽  
Shale Reservoir

scholarly journals Fractal Characterization of Nanopore Structure in Shale, Tight Sandstone and Mudstone from the Ordos Basin of China Using Nitrogen Adsorption

Energies ◽  
2019 ◽  
Vol 12 (4) ◽  
pp. 583 ◽  
Author(s):  
Xiaohong Li ◽  
Zhiyong Gao ◽  
Siyi Fang ◽  
Chao Ren ◽  
Kun Yang ◽  
...  
Keyword(s):  
Pore Structure ◽  
Pressure Range ◽  
Ordos Basin ◽  
Fractal Dimensions ◽  
Nitrogen Adsorption ◽  
Relative Pressure ◽  
Tight Sandstone ◽  
Porosity And Permeability ◽  
The Ordos Basin ◽  
Nanopore Structure

The characteristics of the nanopore structure in shale, tight sandstone and mudstone from the Ordos Basin of China were investigated by X-ray diffraction (XRD) analysis, porosity and permeability tests and low-pressure nitrogen adsorption experiments. Fractal dimensions D1 and D2 were determined from the low relative pressure range (0 < P/P0 < 0.4) and the high relative pressure range (0.4 < P/P0 < 1) of nitrogen adsorption data, respectively, using the Frenkel–Halsey–Hill (FHH) model. Relationships between pore structure parameters, mineral compositions and fractal dimensions were investigated. According to the International Union of Pure and Applied Chemistry (IUPAC) isotherm classification standard, the morphologies of the nitrogen adsorption curves of these 14 samples belong to the H2 and H3 types. Relationships among average pore diameter, Brunner-Emmet-Teller (BET) specific surface area, pore volume, porosity and permeability have been discussed. The heterogeneities of shale nanopore structures were verified, and nanopore size mainly concentrates under 30 nm. The average fractal dimension D1 of all the samples is 2.1187, varying from 1.1755 to 2.6122, and the average fractal dimension D2 is 2.4645, with the range from 2.2144 to 2.7362. Compared with D1, D2 has stronger relationships with pore structure parameters, and can be used for analyzing pore structure characteristics.

scholarly journals Cambrian faults and their control on the sedimentation and reservoirs in the Ordos Basin, NW China

2019 ◽  
Vol 46 (5) ◽  
pp. 883-895 ◽  
Author(s):  
Guoqi WEI ◽  
Qiuying ZHU ◽  
Wei YANG ◽  
Chunlin ZHANG ◽  
Wuling MO
Keyword(s):  
Ordos Basin ◽  
Nw China ◽  
The Ordos Basin

Micro-Nanopore Structure and Fractal Characteristics of Tight Sandstone Gas Reservoirs in the Eastern Ordos Basin, China

2021 ◽  
Vol 21 (1) ◽  
pp. 234-245
Author(s):  
Peng Qiao ◽  
Yiwen Ju ◽  
Jianchao Cai ◽  
Jun Zhao ◽  
Hongjian Zhu ◽  
...  
Keyword(s):  
Fractal Dimension ◽  
Pore Structure ◽  
Ordos Basin ◽  
Gas Storage ◽  
Main Peak ◽  
Storage Space ◽  
Tight Sandstone ◽  
Fractal Characteristics ◽  
Sandstone Reservoirs ◽  
Nanopore Structure

The complex pore system in tight sandstone reservoirs controls the storage and transport of natural gas. Thus, quantitatively characterizing the micro-nanopore structure of tight sandstone reservoirs is of great significance to determining the accumulation and distribution of tight gas. The pore structure of reservoirs was determined through polarizing microscopy, scanning electron microscopy (SEM), and the combination of mercury injection capillary pressure (MICP) and nuclear magnetic resonance (NMR) experiments on Late Paleozoic conventional and tight sandstone samples from the Linxing Block, Ordos Basin. The results show that in contrast to conventional sandstone, dissolution pores, with diameters less than 8 μm, are the main contributors to the gas storage space of tight sandstone reservoirs. The pore size distribution derived from the MICP experiment demonstrates that the main peak of tight sandstones corresponds to a pore radius in the range of 247 nm to 371 nm, while the secondary peak usually corresponds to 18 nm. The results of the NMR test illustrate that the T2 spectra of tight sandstones are unimodal, bimodal and multimodal, and the main NMR peak is highly related to the MICP peak. Fractal theory was proposed to quantitatively characterize the complex pore structure and rough porous surface. The sandstones show fractal characteristics including nanopore fractal dimension DN obtained from the MICP and large pore fractal dimension DL obtained from the NMR experiment. Both DN and DL are positively correlated with porosity and negatively correlated with permeability, demonstrating that complex and heterogeneous pore structure could increase the gas storage space and reduce the connectivity.

Sign in / Sign up

Export Citation Format

Share Document