scholarly journals Pore structure differences of the extra-low permeability sandstone reservoirs and the causes of low resistivity oil layers: A case study of Block Yanwumao in the middle of Ordos Basin, NW China

2018 ◽  
Vol 45 (2) ◽  
pp. 273-280 ◽  
Author(s):  
Jianmin WANG ◽  
San ZHANG
Keyword(s):  
Pore Structure ◽  
Ordos Basin ◽  
Low Permeability ◽  
Nw China ◽  
Low Resistivity ◽  
Sandstone Reservoirs

scholarly journals Synchronous injection-production energy replenishment for a horizontal well in an ultra-low permeability sandstone reservoir: A case study of Changqing oilfield in Ordos Basin, NW China

2020 ◽  
Vol 47 (4) ◽  
pp. 827-835 ◽  
Author(s):  
Jing WANG ◽  
Jungang LIU ◽  
Zhaoguo LI ◽  
Hongchang LI ◽  
Jiaosheng ZHANG ◽  
...  
Keyword(s):  
Horizontal Well ◽  
Ordos Basin ◽  
Low Permeability ◽  
Nw China ◽  
Energy Replenishment ◽  
Sandstone Reservoir

scholarly journals Micro pore and throat characteristics and origin of tight sandstone reservoirs: A case study of the Triassic Chang 6 and Chang 8 members in Longdong area, Ordos Basin, NW China

2018 ◽  
Vol 45 (2) ◽  
pp. 239-250 ◽  
Author(s):  
Hanlin LIU ◽  
Youyun YANG ◽  
Fengqin WANG ◽  
Xiuqin DENG ◽  
Ye LIU ◽  
...  
Keyword(s):  
Ordos Basin ◽  
Tight Sandstone ◽  
Nw China ◽  
Sandstone Reservoirs

Pore structure evaluation of low permeability clastic reservoirs based on sedimentation diagenesis: A case study of the Chang 8 reservoirs in the Zhenbei region, Ordos Basin

2021 ◽  
Vol 196 ◽  
pp. 107841
Author(s):  
Ma Baoquan ◽  
Chen Shumin ◽  
Yan Weilin ◽  
Lin Chengyan ◽  
Zhang Hong ◽  
...  
Keyword(s):  
Pore Structure ◽  
Ordos Basin ◽  
Low Permeability ◽  
Clastic Reservoirs ◽  
Structure Evaluation

Pore structure and fractal characteristics of ultra-low permeability sandstone reservoirs in Upper Triassic Yanchang Formation, Ordos Basin

2021 ◽  
pp. 1-59
Author(s):  
Quanpei Zhang ◽  
Tao Jiao ◽  
Hao Huang ◽  
Zhao Qi ◽  
Tao Jiang ◽  
...  
Keyword(s):  
Pore Structure ◽  
Quality Evaluation ◽  
Pore Space ◽  
Ordos Basin ◽  
Upper Triassic ◽  
Reservoir Quality ◽  
Low Permeability ◽  
Yanchang Formation ◽  
Fractal Characteristics ◽  
Sandstone Reservoirs

The complex pore structure and high heterogeneity of ultra-low permeability sandstone reservoirs have a significant effect on reservoir quality evaluation and hydrocarbon resource assessment. We collected 10 reservoir samples from the Upper Triassic Yanchang Formation Chang 8 in the Zhenbei area of the Ordos Basin. We measured the pore size distribution (PSD) and fluid occurrence characteristics of the reservoir by Pressure-controlled porosimetry (PCP), rate-controlled porosimetry (RCP) and nuclear magnetic resonance (NMR), and then analyzed the results via the fractal theory to determine the pore space fractal characteristics. Our analysis indicates that the three major pore types of these reservoirs are residual intergranular pores, dissolution pores and intercrystalline pores. The pore structure of the ultra-low permeability sandstone reservoirs is highly heterogeneous with pore throats of various scales, and the corresponding fractal characteristics are notably different, exhibiting multi-fractal features. Compared to macropores and mesopores, micropores are more uniform and regular in terms of their PSD and thus only slightly influence the reservoir quality. The complexity of the throat distribution and whole pore space is attributed to the development of dissolution pores and the content of feldspar minerals. Fractal features depend on the movable fluid pore space and effective pores, whose fractal dimensions reflect the complexity of interconnected pores and correlate well with the porosity and permeability. The development of different types and sizes of pore throats in these ultra-low permeability sandstone reservoirs resulted in the observed pore structure heterogeneity. The difference in mineral composition and content of these reservoirs aggravates the pore structure complexity and affects reservoir quality evaluation and further oilfield development.

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