Citation: | He Yun, Wang Ruifei, Zhang Zhanyang, Wang Ruyue, Yin Shuai, He Weiling, Chen Ruina, Xiao Xue. Pore structure and movable fluid characteristics of tight sandstone reservoirs in the Lower Shihezi Formation in the Hangjinqi area, Ordos Basin[J]. Bulletin of Geological Science and Technology, 2023, 42(5): 94-102. doi: 10.19509/j.cnki.dzkq.2022.0134 |
In recent years, new discoveries have been made in the He 1 Member of the Hangjinqi Gas Field. And the initial gas production of some wells by fracturing can reach 10×104 m3/d, which shows that the He 1 Member has great exploration potential. However, due to the strong heterogeneity of the He 1 Member, the gas production mechanism of the He 1 Member is not clear at present, which restricts its efficient development. To accurately and quantitatively characterize the microscopic pore structure and movable fluid characteristics of tight gas sandstone reservoirs.
In this paper, taking the tight sandstone reservoir in the He 1 Member of the Shangshihezi Formation in the Hangjinqi Gas Field as an example, NMR and CT tests were used to study the response characteristics and fluid identification ability of different types of pores in tight sandstone.
The research shows that the porosity of the test samples is mainly distributed in 1.7%-10%, and the gas permeability is mainly distributed in 0.1×10-3-1.4×10-3
Overall, the original movable water saturation of the He 1 Member is low and has great development potential.
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