鄂尔多斯盆地华庆地区延长组6段深水致密砂岩填隙物特征及对储层发育的影响

doi:10.11743/ogg20210508

Abstract

Abstract:

Unconventional tight sandstone reservoir resulting from deepwater gravity flow, as a new hotspot for hydrocarbon exploration and development, has attracted much attention.The deepwater depositional environment is characterized by complex hydrodynamics, resulting in large variation in type and content of interstitials, and strong heterogeneity of reservoirs under microscopic observation, thus challenging petroleum E & P.In this study, an integration of casting thin section and SEM observation, Quantitative Evaluation of Materials by Scanning Electron Microscopy (QEMSCAN), electron microprobe and nano CT analysis, is applied to finely characterize the microscopic features of various interstitial matter in the deepwater tight sandstone of the 6^th member of Yanchang Formation (Chang 6 Member) in Huaqing area, Ordos Basin, and discuss the effects of interstitials on reservoir pore structure and physical properties.The results show that the matrix is not completely tight, which could, under diagenetic modification, generate a complex secondary pore network consisting of intercrystalline and dissolved pores with a pore size ranging between 20 nm and 1 000 nm.With a matrix content of less than or equal to 7%, the matrix contains well-developed secondary pores, which has a positive impact on reservoir quality; with a matrix content of greater than 7%, the secondary pore development is undermined, exacerbating reservoir compaction.The intercrystalline pores in clay mineral cements, however, could alleviate the reduction of porosity to some extent; on the other hand, the morphology, occurrence of different clay minerals, and their effect on reservoir sensitivity, function to increase the complexity of clay mineral-permeability relationship.In areas with high content of illite, I/S mixed layer and thick chlorite, the reservoirs are commonly poor in physical properties; while high-quality reservoirs are most seen in areas of well-developed kaolinite.Carbonate and siliceous cements are key in undermining the physical properties of deepwater tight sandstone reservoirs.In all, the area with a matrix content of 7% or less and relatively well-developed kaolinite cement is a focus for the exploration and development of tight sandstone reservoirs of deepwater facies.

Key words: matrix, clay mineral, interstitial matter, deepwater gravity flow, tight sandstone of deep water facies, high-quality reservoir, Huaqing area, Ordos Basin

CLC Number:

TE122.2

Zhaobing Chen, Zhenyu Zhao, Ling Fu, Jianrong Gao, Wei Song, Xinjing Chen. Interstitial matter and its impact on reservoir development in Chang 6 deepwater tight sandstone in Huaqing area, Ordos Basin[J]. Oil & Gas Geology, 2021, 42(5): 1098-1111.

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样品号	深度/m	粘土矿物相对含量/%				伊/蒙混层比/%
样品号	深度/m	伊/蒙混层	伊利石	高岭石	绿泥石	伊/蒙混层比/%
HQ1-1	2 132.8	57	26	3	14	5
HQ2-2	2 073.3	38	5	11	46	5
HQ3-1	2 087.6	50	10	5	35	5
HQ4-1	2 091.0	25	7	11	57	5
HQ5-1	2 199.5	59	29	3	9	10
HQ6-4	2 259.1	59	20	4	17	10
HQ6-7	2 264.0	63	23	3	11	10
HQ7-1	2 269.1	61	8	4	27	5
HQ8-3	2 206.1	73	13	3	11	5
HQ10-1	2 241.3	42	7	6	45	10
HQ11-1	2 241.6	59	4	4	33	10
HQ11-3	2 055.2	60	7	5	28	10
HQ12-1	2 099.6	53	6	6	35	5
HQ12-3	2 103.6	41	4	7	48	5
HQ13-1	2 105.9	28	5	10	57	5
HQ14-1	2 208.4	10	2	15	73	5
HQ14-2	2 212.8	2	2	15	81	5
HQ14-4	2 222.4	11	2	16	71	5
平均		44	10	7	39	7

粘土矿物	晶胞结构	产状	晶间孔占粘土矿物体积比/%		晶间孔孔径/nm		孔隙贡献率/%	样品数/个
粘土矿物	晶胞结构	产状	范围	平均	主体范围	平均	孔隙贡献率/%	样品数/个
伊利石	2 ∶1	丝缕状	80~95	90	500~4 000	900	10.3	11
伊利石	2 ∶1	片状	60~80	70	50~3 000	600	10.3	11
伊/蒙混层	2 ∶1	蜂窝状、网状	60~70	65	100~4 000	750	8.6	8
绿泥石	2 ∶1	叶片状	35~50	40	50~1 000	240	3.7	8
绿泥石	2 ∶1	绒球状	25~40	30	20~800	180	3.7	8
高岭石	1 ∶1	松散书页状、蠕虫状	45~65	55	50~4000	700	7.8	12

样品编号	深度/m	矿物含量/%
样品编号	深度/m	石英	斜长石	钾长石	方解石	白云石	菱铁矿	粘土矿物总量
HQ1-1	2 132.8	57.8	11.9	3.1	1.4	3.5	0.3	22.0
HQ2-2	2 073.3	28.6	40.7	6.6	4.4	4.7	0.0	15.0
HQ3-1	2 087.6	28.1	40.1	8.9	0.2	2.8	1.0	18.9
HQ4-1	2 091.0	36.2	42.3	8.0	2.1	1.5	0.3	9.6
HQ5-1	2 199.5	52.5	7.7	9.9	0.0	7.5	0.7	21.7
HQ6-4	2 259.1	67.1	9.1	2.9	0.7	4.3	1.4	14.5
HQ6-7	2 264.0	58.0	11.6	5.8	0.3	3.0	0.9	20.4
HQ7-1	2 269.1	43.0	18.4	8.3	3.1	3.2	2.0	22.0
HQ8-3	2 206.1	49.1	12.0	2.7	0.4	6.2	1.9	27.7
HQ10-1	2 241.3	39.2	27.0	6.4	1.3	3.2	0.6	22.3
HQ11-1	2 241.6	30.3	44.6	8.6	0.1	2.0	0.7	13.7
HQ11-3	2 055.2	39.1	29.6	4.5	0.8	4.6	0.0	21.4
HQ12-1	2 099.6	30.8	32.7	8.9	0.0	11.7	0.0	15.9
HQ12-3	2 103.6	37.9	33.0	4.8	4.2	2.7	0.0	17.4
HQ13-1	2 105.9	38.4	33.5	6.4	0.3	3.2	0.2	18.0
HQ14-1	2 208.4	29.7	39.6	18.0	0.2	0.8	0.0	11.7
HQ14-2	2 212.8	37.1	45.6	7.4	0.1	0.9	0.0	8.9
HQ14-4	2 222.4	31.0	43.2	10.2	1.6	2.3	0.5	11.2
平均		40.8	29.0	7.3	1.2	3.8	0.6	17.4

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Interstitial matter and its impact on reservoir development in Chang 6 deepwater tight sandstone in Huaqing area, Ordos Basin

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