Distribution Characteristics and Main Controlling Factors of Movable Fluid in Tight Sandstone Reservoir of Linxing Gasfield

doi:10.3969/j.issn.1006-6535.2024.02.018

Abstract

Abstract: To address the problem of complex microporous structure and unknown distribution characteristics and control factors of movable fluid in the reservoirs of Linxing Area in the Ordos Basin, by comprehensively utilizing low-field nuclear magnetic resonance (NMR), field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD) analysis, nuclear magnetic resonance (NMR) imaging, and CT scanning, we quantitatively portrayed the saturation characteristics of the moveable fluids of the Upper Shihezi Formation and the Taiyuan Formation of the Linxing Gasfield, and analyzed the relations among the porosity, permeability, mineralogical composition of the rocks, microscopic porosity connectivity and the saturation of the moveable fluids. The results show that the average movable fluid saturation of the reservoirs of the Shihezi Formation in Linxing Area is 58.05%, and the average fluid saturation of the reservoirs of the Taiyuan Formation is 48.60%, and the average fluid saturation of the reservoirs of the Shihezi Formation is significantly higher than that of the Taiyuan Formation; the permeability and the percentage of porosity connectivity are the important factors influencing the movable fluid saturation of the dense sandstone reservoirs. The results of the study can provide a strong support for the understanding of permeability rules and the preparation of the development plan for dense sandstone reservoirs in Linxing Area.

Key words: tight sandstone gas reservoirs, nuclear magnetic resonance, movable fluids, main controlling factors, Linxing Gasfield

CLC Number:

TE349

Du Jia, Guo Jingjing, Liu Yancheng, Zhang Yingchun. Distribution Characteristics and Main Controlling Factors of Movable Fluid in Tight Sandstone Reservoir of Linxing Gasfield[J]. Special Oil & Gas Reservoirs, 2024, 31(2): 152-158.

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