Comparison of diagenetic characteristics and pore evolution in outcrops and cores of tight sandstone reservoirs in the Triassic Yanchang Formation, the Ordos Basin, China

AAPG Bulletin ◽  
2020 ◽  
Vol 104 (11) ◽  
pp. 2429-2452
Author(s):  
Zongquan Hu ◽  
Herong Zheng ◽  
Wei Yin ◽  
Chunyan Liu ◽  
Chuanxiang Sun ◽  
...  
Keyword(s):  
Ordos Basin ◽  
Tight Sandstone ◽  
Yanchang Formation ◽  
Pore Evolution ◽  
The Ordos Basin ◽  
Sandstone Reservoirs

scholarly journals Quantitative evaluation of the diagenesis and porosity evolution of tight sandstone reservoirs: A case study of the Yanchang formation in the Southern Ordos basin, China

2019 ◽  
Vol 9 (1) ◽  
pp. 15-26
Author(s):  
Meng Xiao ◽  
Dawei Chen ◽  
Guiqiang Qiu ◽  
Xuanjun Yuan ◽  
Chunfang Chen
Keyword(s):  
Pore Size ◽  
Average Pore Size ◽  
Ordos Basin ◽  
Influential Factor ◽  
Tight Sandstone ◽  
Average Pore ◽  
Yanchang Formation ◽  
Porosity Evolution ◽  
Pore Evolution ◽  
Sandstone Reservoirs

Evaluation of the pore evolution is key to gaining a better understanding of oil migration and accumulation in tight oil exploration for tight sandstone; to study the diagenesis and porosity evolution of tight sandstone reservoirs, we analysed the 8th member of the Yanchang Formation by core observation, thin section observation, cathodoluminescence, scanning electron microscopy, and logging data analysis. The following conclusions can be drawn (1) In the typical tight sandstone reservoir, numerous secondary pores developed at burial depths in the range of 1300 m to 1400 m, and approximately 1500 m to 1600 m. (2) Compaction was the most influential factor of reservoir density and decreased the average pore size by 24.8%. Carbonate cementation decreased the porosity by 8.2%. The most important diagenetic process for increasing the reservoir porosity was dissolution, which increased the pore size by 5.1%. In addition, chlorite played an active role in inhibiting secondary quartz growth and preserving primary pores. (3) The early gas invasion can inhibit diagenesis, and the organic acids produced by the later oil can increase dissolution, so that the high oil saturation phenomenon becomes more obvious.

scholarly journals Imaging‐Based Characterization of Perthite in the Upper Triassic Yanchang Formation Tight Sandstone of the Ordos Basin, China

2019 ◽  
Vol 93 (2) ◽  
pp. 373-385 ◽  
Author(s):  
Shuheng DU ◽  
Guoxin SHI ◽  
Xinjian YUE ◽  
Gen KOU ◽  
Bo ZHOU ◽  
...  
Keyword(s):  
Ordos Basin ◽  
Upper Triassic ◽  
Tight Sandstone ◽  
Yanchang Formation ◽  
The Ordos Basin
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