The Relationship between Geomechanical Response of Natural Fractures and Reservoir Productivity in Keshen Tight Sandstone Gas Field, Tarim Basin, China

2015 ◽  
Author(s):  
Haijun Yang ◽  
Hui Zhang ◽  
Zhenzhong Cai ◽  
Sheng Chen ◽  
Fang Yuan ◽  
...  
Keyword(s):  
Tarim Basin ◽  
Natural Fractures ◽  
Tight Sandstone ◽  
Gas Field ◽  
The Relationship

Research and Practice on Enhancing Recovery of Tight Sandstone Gas Reservoirs in Kelasu Gas Field, Tarim Basin

2021 ◽  
Author(s):  
Guoxin Li ◽  
Jun Tian ◽  
Xiaowen Duan ◽  
Haijun Yang ◽  
Yongliang Tang ◽  
...  
Keyword(s):  
Tarim Basin ◽  
Gas Reservoirs ◽  
Tight Sandstone ◽  
Gas Field ◽  
Research And Practice

Impacts of diagenesis of tight sandstone gas reservoir on reservoir physical properties: A case study, Sulige gas field, Ordos Basin, China

2019 ◽  
Vol 7 (3) ◽  
pp. T687-T699
Author(s):  
Shuwei Ma ◽  
Dazhong Ren ◽  
Lifa Zhou ◽  
Fengjuan Dong ◽  
Shi Shi ◽  
...  
Keyword(s):  
Physical Properties ◽  
Ordos Basin ◽  
Tight Sandstone ◽  
Gas Reservoir ◽  
Gas Field ◽  
Tight Gas Reservoir ◽  
Pore Evolution ◽  
The Ordos Basin ◽  
Primary Porosity ◽  
The Relationship

Diagenesis is one of the most important factors impacting the performance of many reservoirs and is perhaps the most important factor impacting the performance of tight sandstone reservoirs, such as those of the Sulige gas field in the Ordos Basin of China. However, the relationship between diagenesis and related parameters determining reservoir physical properties remains unclear. Therefore, we have analyzed experimental data from high-pressure mercury intrusion porosimetry, scanning electron microscopy, and thin sections in addition to using a porosity recovery calculation model to investigate microscopic characteristics, diagenesis, and pore-evolution processes of the low-permeability tight gas reservoir of the He-8 unit of the Sulige gas field in the Ordos Basin. In addition, we have identified the impacts of diagenesis on reservoir characteristics and established the relationship between diagenesis and reservoir quality evolution. We also used the Beard primary porosity model to recover the primary porosity, and to built the reducing and enhancing calculation models for intergranular pore, dissolution pore, and intercrystalline pore during diagenesis. Based on the quantitative relationship between diagenesis processes and porosity evolution, we found that the results of simulation calculation and experimental works were in close agreement with minimal error.

Natural fractures in tight gas sandstones: a case study of the Upper Triassic Xujiahe Formation in Xinchang gas field, Western Sichuan Basin, China

2021 ◽  
pp. 1-18
Author(s):  
Yunzhao Zhang ◽  
Lianbo Zeng ◽  
Wenya Lyu ◽  
Dongsheng Sun ◽  
Shuangquan Chen ◽  
...  
Keyword(s):  
Production Capacity ◽  
Gas Production ◽  
Upper Triassic ◽  
Tight Gas ◽  
Natural Fractures ◽  
Carbon And Oxygen Isotopes ◽  
Gas Field ◽  
Xujiahe Formation ◽  
Western Sichuan ◽  
Tight Gas Reservoir

Abstract The Upper Triassic Xujiahe Formation is a typical tight gas reservoir in which natural fractures determine the migration, accumulation and production capacity of tight gas. In this study, we focused on the influences of natural fractures on the tight gas migration and production. We clarified characteristics and attributes (i.e. dips, apertures, filling degree and cross-cutting relationships) of the fractures based on image logging interpretations and core descriptions. Previous studies of electron spin resonance, carbon and oxygen isotopes, homogenization temperature of fluid inclusions analysis and basin simulation were considered. This study also analysed the fracture sequences, source of fracture fillings, diagenetic sequences and tight gas enrichment stages. We obtained insight into the relationship between fracture evolution and hydrocarbon charging, particularly the effect of the apertures and intensity of natural fractures on tight gas production. We reveal that the bedding fractures are short horizontal migration channels of tight gas. The tectonic fractures with middle, high and nearly vertical angles are beneficial to tight gas vertical migration. The apertures of fractures are controlled by the direction of maximum principal stress and fracture angle. The initial gas production of the vertical wells presents a positive correlation with the fracture abundance, and the intensity and aperture of fractures are the fundamental factors that determine the tight gas production. With these findings, this study is expected to guide the future exploration and development of tight gas with similar geological backgrounds.

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