四川盆地川西坳陷上三叠统须家河组三段和五段“甜点”储层特征及分布

doi:10.11743/ogg20210405

Abstract

Abstract:

The third and fifth members of Xujiahe Formation in Western Sichuan Depression are characterized by thick source rocks with high TOC and medium- to large-scale delta distributary channel and sheet sandstones of huge in-source accumulation potential.A systematic study was carried out on the characteristics, formation mechanism and distribution of "sweet spot" reservoirs in the two members based on an integration of petrography, pore structure, and petrophysical property analyses with well logging interpretations.The results show that fine-grained thin sandstone interbeds against a delta front to shore-shallow lacustrine environment dominate the two members, with the third member in southern Chengdu Sag containing some single- or multiple-layered thick sandstone against delta distributary channels.The thin sandstone reservoirs are characterized by diverse rock types, fine grain size, and high contents of clay matrix and carbonate minerals, and rather tight due to intensive compaction and carbonate cementation."Sweet spot" reservoirs in the thin sandstones are mainly the results of hydrocarbon generation, dissolution and fracturing processes.Assemblages of organic-rich shale and fine- to medium-grained sandstone with high content of quartz (feldspar) and small amount of carbonate debris (cement) are considered potential sweet spots.The thick sandstone reservoirs are dominated by secondary pores and fractures.Sweet spots are mostly controlled by granularity, the content of feldspar (quartz) and other soluble (brittle) minerals as well as dissolution intensity, of which the latter is the key factor.The fifth member in the south of Longmenshan front structural belt and Xinchang structural belt is most likely to contain thin sandstone sweet spots because of its high-quality source rocks, high content of quartz (feldspar and clay), and low content of carbonate minerals.While the third member in southern Chengdu Sag is ideal for the thick sandstone sweet spots to develop in quartz (feldspar)-rich medium- to coarse-grained sandstones adjacent to shales vertically and laterally.

Key words: continental source rock, formation mechanism, "sweet spot" reservoir, Xujiahe Formation, Western Sichuan Depression, Sichuan Basin

CLC Number:

TE122.2

Sujuan Ye, Yingtao Yang, Ling Zhang. Characteristics and distribution of "sweet spot" reservoirs in the third and fifth members of Upper Triassic Xujiahe Formation, Western Sichuan Depression, Sichuan Basin[J]. Oil & Gas Geology, 2021, 42(4): 829-840, 862.

Figures/Tables 12

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地层	岩石类型	岩性	样品数/个	碎屑组分含量/%							自生矿物含量/%
				石英	长石	岩屑					方解石	白云石	硅质
				石英	长石	总量	沉积	变质	火山		方解石	白云石	硅质
T₃x³	厚层砂岩	中-粗砂岩	769	8.0~90.0 (70.1)	0~26.0 (9.4)	0~90.0 (20.5)	0~73.0 (8.5)	1.0~30.0 (9.0)	0~40.0 (3.1)		0~45.0 (3.3)	0~20.0 (0.4)	0~5.0 (1.4)
	薄层砂岩	中-细砂岩	624	8.0~100.0 (71.1)	0~15.0 (2.0)	0~90.0 (26.9)	0~86.0 (19.9)	0~25.0 (6.4)	0~35.0 (0.7)		0~39.0 (5.9)	0~38.0 (4.2)	0~5.0 (0.4)
	薄层砂岩	粉砂岩	98	—	—	—	—	—	—		0~47.0 (7.6)	0~36.0 (6.6)	—
T₃x⁵	薄层砂岩	中-细砂岩	536	3.0~93.0 (48.6)	0~20.0 (1.4)	7.0~97.0 (50.0)	3.0~96.0 (35.8)	0~50.0 (12.8)	0~20.0 (1.3)		0~40.0 (6.6)	0~20.0 (0.7)	0~4.0 (0.1)
T₃x⁵	薄层砂岩	粉砂岩	143	—	—	—	—	—	—		0~32.0 (7.1)	0~15.0 (1.1)	—

地层	岩石类型	岩性	样品数/个	岩石组分含量/%
				石英	长石	方解石	白云石	粘土矿物
				石英	长石	方解石	白云石	总量	伊利石	高岭石		绿泥石	伊/蒙混层
T₃x³	厚层砂岩	中-粗砂岩	131	45.7~84.9 (65.4)	5.2~35.9 (18.2)	0~31.8 (2.3)	0~10.1 (2.5)	3.1~26.6 (11.9)	0.7~15.4 (6.0)	0		1.4~8.1 (3.3)	1.1~8.2 (2.6)
T₃x³	薄层砂岩	中-细砂岩	48	32.5~87.6 (63.0)	0~11.2 (4.0)	0~46.2 (10.7)	0~28.3 (8.7)	1.2~28.0 (11.5)	3.3~20.5 (5.8)	0.8~7.1 (2.5)		0.5~5.9 (1.6)	0.8~6.3 (1.6)
T₃x⁵	薄层砂岩	中-细砂岩	73	7.1~83.6 (42.4)	0~17.0 (3.1)	0~73.9 (20.2)	0~36.7 (12.2)	2.5~22.9 (16.0)	0.7~13.4 (5.5)	0~8.4 (2.9)		0.5~5.9 (2.3)	0~13.0 (5.6)
		粉砂岩	91	21.0~63.9 (43.4)	0~20.0 (5.8)	0~24.2 (7.3)	0~22.0 (5.4)	23.0~42.9 (32.9)	3.4~22.8 (11.1)	1.7~8.5 (4.0)		2.1~7.5 (3.7)	4.4~25.5 (14.3)
		泥页岩	35	22.5~49.0 (36.7)	0~12.0 (4.2)	0~10.9 (3.7)	0~15.4 (3.2)	43.0~65.6 (50.0)	0~21.1 (13.7)	0~9.2 (4.6)		0~10.5 (5.3)	0~32.5 (23.0)

岩石类型	孔隙度/%	渗透率/(10^-3 μm²)	碳酸盐胶结物含量/%	自生硅质含量/%	泥质含量/%
粗粒砂岩	3.2	0.15	4.4	1.8	0.6
中粒砂岩	3.2	0.11	3.4	1.4	0.6
细粒砂岩	2.9	0.08	7.8	0.7	1.1
粉砂岩	—	—	14.7	0.05	13.0

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Characteristics and distribution of "sweet spot" reservoirs in the third and fifth members of Upper Triassic Xujiahe Formation, Western Sichuan Depression, Sichuan Basin

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