Features of Microscopic Pore Structure and Their Influence on Oil Displacement Efficiency in Chang 81 Reservoir of Xifeng Oilfield, Ordos Basin

doi:10.19657/j.geoscience.1000-8527.2018.06.08

Abstract

Abstract:

High heterogeneity in pore structure, rapid rise in water content and high pressure in water injection are reported at the Chang 8₁ reservoir in the Xifeng Oilfield, Ordos Basin. We present detailed experimental study on the features of the microscopic pore structure and its influence on the oil displacement efficiency. The techniques employed include grading analysis, physical property measurement, X-ray diffraction (XRD), thin section casting, SEM, high pressure mercury penetration and water-driven displacement test with real microscopic sandstone models. Based on the capillary pressure curve and its corresponding parameters, we divide the pore structures of Chang8₁ reservoir into four types, i.e.A, B, C and D. Our research shows that different pore structures correspond to different reservoir storage space. There are significant differences among the four types of the water flooding paths and oil displacement efficiency. Pore throat radius is the key that affects oil displacement efficiency. Oil displacement efficiency increases with permeability and porosity. Meanwhile, better reservoir rock pore structure correlates with higher oil displacement efficiency. Comprehensive analysis shows that the relationships between the feature of the microscopic pore structure and the oil displacement efficiency provide a reliable basis to find prospective reservoirs and enhance our understanding on them.

Key words: micro-pore structure, water flooding seepage experiment, Xifeng Oilfield, reservoir property, pore structure type

CLC Number:

TE122.2

LI Pan, SUN Wei, WANG Zhen, HUANG Hexin, ZHE Wenxu. Features of Microscopic Pore Structure and Their Influence on Oil Displacement Efficiency in Chang 8₁ Reservoir of Xifeng Oilfield, Ordos Basin[J]. Geoscience, 2018, 32(06): 1194-1202.

Figures/Tables 10

References 23

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孔隙类型	参数类型	物性			常规压汞								孔喉类型		样品个数/个
孔隙类型	参数类型	孔隙度/%	渗透率/ 10^-3μm²		排驱压力/MPa		主流喉道半径/μm		最大进汞饱和度/%		分选系数		孔喉类型		样品个数/个
A	最大值	13.11	6.95	0.74		0.22		86.30		2.91		残余粒间孔、长石溶孔		5
	平均值	10.21	1.71	0.45		0.18		83.16		2.16
	最小值	7.36	0.07	0.12		0.02		46.80		1.26
B	最大值	16.31	3.56	0.73		0.33		84.20		2.74		残余粒间孔、岩屑溶孔		6
	平均值	9.78	1.27	0.55		0.15		76.52		1.95
	最小值	4.57	0.19	0.28		0.04		42.10		1.07
C	最大值	14.49	3.97	2.93		0.27		80.6		2.64		溶孔-粒间孔		8
	平均值	8.56	1.05	1.12		0.08		72.1		1.87
	最小值	4.08	0.01	0.11		0.04		24.8		1.08
D	最大值	13.77	5.99	1.68		0.09		43.0		2.56		残余粒间孔、晶间微孔		2
	平均值	8.32	1.01	1.73		0.05		39.4		1.50
	最小值	1.98	0.01	0.02		0.02		22.4		0.56

孔隙类型	参数类型	物性			常规压汞								孔喉类型		样品个数/个
孔隙类型	参数类型	孔隙度/%	渗透率/ 10^-3μm²		排驱压力/MPa		主流喉道半径/μm		最大进汞饱和度/%		分选系数		孔喉类型		样品个数/个
A	最大值	13.11	6.95	0.74		0.22		86.30		2.91		残余粒间孔、长石溶孔		5
	平均值	10.21	1.71	0.45		0.18		83.16		2.16
	最小值	7.36	0.07	0.12		0.02		46.80		1.26
B	最大值	16.31	3.56	0.73		0.33		84.20		2.74		残余粒间孔、岩屑溶孔		6
	平均值	9.78	1.27	0.55		0.15		76.52		1.95
	最小值	4.57	0.19	0.28		0.04		42.10		1.07
C	最大值	14.49	3.97	2.93		0.27		80.6		2.64		溶孔-粒间孔		8
	平均值	8.56	1.05	1.12		0.08		72.1		1.87
	最小值	4.08	0.01	0.11		0.04		24.8		1.08
D	最大值	13.77	5.99	1.68		0.09		43.0		2.56		残余粒间孔、晶间微孔		2
	平均值	8.32	1.01	1.73		0.05		39.4		1.50
	最小值	1.98	0.01	0.02		0.02		22.4		0.56

孔隙结构类型	井号	深度 /m	孔隙度 /%	渗透率 /10^-3μm²	无水期				最终期
					驱油效率/%		主要驱替路径		驱油效率/%		主要驱替路径
					单一样品	平均值	主要驱替路径		单一样品	平均值	主要驱替路径
A类	Z58	2 033.75	8.914	2.758	33.33	32.29	均匀驱替	55.56		54.78	均匀驱替
A类	Z58	2 039.66	9.478	2.260	31.25	32.29	网状-均匀驱替	54.00		54.78	均匀驱替
B类	X147	2 015.00	8.588	2.01	30.16	32.27	网状-均匀驱替	50.00		46.78	网状-均匀驱替
B类	Z58	2 022.75	7.934	1.56	26.34		网状-均匀驱替	50.00			网状-均匀驱替
B类	X248	2 011.50	8.459	1.01	32.19		网状-均匀驱替	46.67			网状-均匀驱替
B类	Z58	2 052.65	9.243	1.065	28.57		网状-均匀驱替	45.00			网状-均匀驱替
B类	X248	2 017.00	7.812	0.795	36.36		指状-网状驱替	45.00			网状-均匀驱替
B类	X250	2 066.30	6.356	0.45	40.00		指状-网状驱替	44.00			网状-均匀驱替
C类	Z58	2 028.20	5.455	0.677	35.48	23.17	指状-网状驱替	39.52		37.26	网状-均匀驱替
C类	X171	2 057.37	9.445	0.92	14.29		指状-网状驱替	38.57			指状-网状驱替
C类	X205	2 029.40	4.707	2.90	12.50		指状-网状驱替	37.50			指状-网状驱替
C类	X250	2 062.22	4.29	0.286	28.57		指状驱替	35.71			指状-网状驱替
C类	Z58	2 036.70	5.62	0.194	25.00		指状驱替	35.00			指状-网状驱替
D类	X250	2 048.11	2.554	0.32	22.22	22.22	指状驱替	33.35		33.35	指状驱替

孔隙结构类型	井号	深度 /m	孔隙度 /%	渗透率 /10^-3μm²	无水期				最终期
					驱油效率/%		主要驱替路径		驱油效率/%		主要驱替路径
					单一样品	平均值	主要驱替路径		单一样品	平均值	主要驱替路径
A类	Z58	2 033.75	8.914	2.758	33.33	32.29	均匀驱替	55.56		54.78	均匀驱替
A类	Z58	2 039.66	9.478	2.260	31.25	32.29	网状-均匀驱替	54.00		54.78	均匀驱替
B类	X147	2 015.00	8.588	2.01	30.16	32.27	网状-均匀驱替	50.00		46.78	网状-均匀驱替
B类	Z58	2 022.75	7.934	1.56	26.34		网状-均匀驱替	50.00			网状-均匀驱替
B类	X248	2 011.50	8.459	1.01	32.19		网状-均匀驱替	46.67			网状-均匀驱替
B类	Z58	2 052.65	9.243	1.065	28.57		网状-均匀驱替	45.00			网状-均匀驱替
B类	X248	2 017.00	7.812	0.795	36.36		指状-网状驱替	45.00			网状-均匀驱替
B类	X250	2 066.30	6.356	0.45	40.00		指状-网状驱替	44.00			网状-均匀驱替
C类	Z58	2 028.20	5.455	0.677	35.48	23.17	指状-网状驱替	39.52		37.26	网状-均匀驱替
C类	X171	2 057.37	9.445	0.92	14.29		指状-网状驱替	38.57			指状-网状驱替
C类	X205	2 029.40	4.707	2.90	12.50		指状-网状驱替	37.50			指状-网状驱替
C类	X250	2 062.22	4.29	0.286	28.57		指状驱替	35.71			指状-网状驱替
C类	Z58	2 036.70	5.62	0.194	25.00		指状驱替	35.00			指状-网状驱替
D类	X250	2 048.11	2.554	0.32	22.22	22.22	指状驱替	33.35		33.35	指状驱替

Features of Microscopic Pore Structure and Their Influence on Oil Displacement Efficiency in Chang 8₁ Reservoir of Xifeng Oilfield, Ordos Basin

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