Study of pore-throat structure characteristics and fluid mobility of Chang 7 tight sandstone reservoir in Jiyuan area, Ordos Basin

被引:2
|
作者
Zhang, Quanpei [1 ]
Qi, Hongpeng [2 ]
Huo, Yong [1 ]
Li, Yong [1 ]
Li, Tao [1 ]
Zhang, Duoduo [1 ]
Lin, Kun [1 ]
Yang, Chen [1 ]
Tong, Jian [1 ]
Zhao, Hui [1 ]
Suo, Busen [1 ]
Xue, Yalan [1 ]
Yi, Caiping [1 ]
机构
[1] Wuhua Energy Technol Co Ltd, 20 Middle Sect Zhuque St, Xian 710061, Shaanxi, Peoples R China
[2] Shaanxi Yanchang Petr Grp Co Ltd, Wuqi Oil Prod Plant, Wuqi 717600, Peoples R China
关键词
pore-throat structure; movable fluid; Jiyuan area; fluid mobility; movable fluid effective porosity; TRIASSIC YANCHANG FORMATION; MAIN CONTROLLING FACTORS; FRACTAL CHARACTERISTICS; SONGLIAO BASIN; POROUS-MEDIA; NMR; PERMEABILITY; DIMENSION; SHALE; GAS;
D O I
10.1515/geo-2022-0534
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Quantitative studies of the pore-throat structure (PTS) characteristics of tight sandstone reservoirs and their effects on fluid mobility were proposed to accurately evaluate reservoir quality and predict sweet spots for tight oil exploration. This study conducted high-pressure mercury injection (HPMI) and nuclear magnetic resonance (NMR) experiments on 14 tight sandstone samples from the Chang 7 member of the Yanchang Formation in the Jiyuan area of the Ordos Basin. The HPMI was combined with the piecewise fitting method to transform the NMR movable fluid transverse relaxation time (T-2) spectrum and quantitatively characterize the PTS characteristics and the full pore-throat size distribution (PSD). Then, movable fluid effective porosity (MFEP) was proposed to quantitatively evaluate the fluid mobility of tight sandstone reservoirs and systematically elucidate its main controlling factors. The results showed that the PTS could be divided into four types (I, II, III, and IV), which showed gradual decreases in average pore-throat radius (R-a), continuous increases in the total fractal dimension (D-t), and successive deterioration of reservoir fluid mobility and percolation capacity. Moreover, the full PSD (0.001-10 mu m) showed unimodal and multi-fractal characteristics. According to the Swanson parameter (r(apex)), the reservoir space types can be divided into small and large pore-throat and the corresponding fractal dimension has a relationship where D-1 < D-2. Large pore-throat had higher permeability contribution and pore-throat heterogeneity but a lower development degree and MFEP than small pore-throat, which had a relatively uniform and regular PSD and represented the primary location of movable fluids. Moreover, the development degree and heterogeneity of small pore throat controlled the flowability of reservoir fluids. MFEP can overcome the constraints of tiny throats and clay minerals on movable fluid, quantify the movable fluid content occupying the effective reservoir space, and accurately evaluate the reservoir fluid mobility. The combination and development of various pore-throat sizes and types in tight sandstone reservoirs results in different PTS characteristics, whereas differences in the mineral composition and content of reservoirs aggravate PTS heterogeneity, which is the main factor controlling the fluid mobility.
引用
收藏
页数:18
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