渤海湾盆地东营凹陷古近系沙河街组页岩储层润湿性及其主控因素

doi:10.11743/ogg20240417

Abstract

Abstract:

Wettability， a factor influencing the occurrence and seepage patterns of shale oil in reservoirs， is an important indicator of shale reservoir evaluation. Using contact angle measurements and spontaneous imbibition experiments， we quantitatively characterize the wettability of shale reservoirs in the Shahejie Formation， Dongying Sag， Bohai Bay Basin， while delving into the primary determinants of wettability， and selecting the optimal reservoirs for assessment. The findings suggest that the shale reservoirs in the Shahejie Formation exhibit moderate pore connectivity and fractional wettability， generally proving to be water-wet to weakly water-wet. The reservoir wettability is jointly determined by organic matter characteristics， mineral components， pore size， and shale oil composition. The impacts of organic matter and mineral composition on reservoir wettability depend on the interfacial tension of solid particles. Specifically， a higher abundance of organic matter and a higher calcium content in minerals are associated with reduced water wettability and stronger oil wettability of the reservoirs. The oil-bearing capacity and shale oil components alter the surface tension of liquids， further influencing the reservoir wettability. A higher oil-bearing capacity of reservoirs and the presence of more polar components in crude oil suggest stronger oil wettability. Pore structure influences the solid-liquid interfacial tension through capillary pressure， further affecting the reservoir wettability. A larger pore size corresponds to weaker water wettability and stronger oil wettability of the reservoirs. The wettability assessment results demonstrate that lamellar organic-rich calcareous shales exhibit the strongest lipophilicity. Shale oil tends to be enriched and accumulate in these shales under weakly water-wet conditions， creating conducive conditions for shale oil production. Therefore， these shales serve as favorable targets for shale oil exploration and production.

Key words: contact angle, spontaneous imbibition, reservoir wettability, shale, Shahejie Formation, Dongying Sag, Bohai Bay Basin

CLC Number:

TE122.2

Qianwen LI. Wettability and its major determinants of shale reservoirs in the Shahejie Formation， Dongying Sag， Bohai Bay Basin[J]. Oil & Gas Geology, 2024, 45(4): 1142-1154.

Figures/Tables 13

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样品编号	井号	层位	TOC/%	S₁/ （mg/g）	S₂/ （mg/g）	矿物组分含量/%						岩相
样品编号	井号	层位	TOC/%	S₁/ （mg/g）	S₂/ （mg/g）	黏土矿物	石英	钾长石	斜长石	方解石	白云石	岩相
①	Y556	沙三下亚段	2.7	0.5	11.5	37.0	20.0	1.7	2.5	31.6	0	层状富有机质钙质页岩
②	L752		0.6	0.1	0.3	46.1	26.3	4.3	11.1	3.5	4.8	块状贫有机质硅质泥岩
③	Y556		2.6	0.5	10.8	32.8	19.8	1.8	3.0	25.6	6.9	层状富有机质钙质页岩
④	F41		2.6	1.5	12.3	40.7	17.5	0.9	3.1	26.5	1.8	层状富有机质钙质页岩
⑤	F41		1.2	1.4	3.1	13.2	33.3	8.5	32.2	8.3	4.5	块状含有机质富硅质泥岩
⑥	L752		1.3	0.9	2.2	7.7	5.8	0.1	2.2	22.0	55.8	层状含有机质富钙质页岩
⑦	F41		1.7	0.3	3.5	14.0	38.7	5.8	18.5	11.2	6.6	块状含有机质富硅质泥岩
⑧	H88	沙四上亚段	0.2	0.1	0.2	2.6	43.0	5.1	16.8	14.7	14.0	块状贫有机质富硅质页岩
⑨	F169		0.7	0.2	0.2	39.8	30.8	1.8	11.1	6.1	10.3	纹层状贫有机质硅质页岩
⑩	B172		0.9	0.2	0.2	14.8	35.5	2.5	10.3	6.1	30.8	块状含有机质含泥硅质页岩
⑪	H88		2.3	1.2	11.6	25.5	13.1	1.3	6.8	41.3	8.9	层状富有机质富钙质页岩
⑫	Y556		2.4	1.0	12.1	27.6	22.3	1.7	5.7	19.9	15.7	纹层状富有机质钙质页岩
⑬	L76		0.3	0.1	0.2	32.1	37.7	4.8	10.5	2.3	8.3	块状贫有机质富硅质泥岩
⑭	L76		0.4	0.1	0.2	28.9	40.0	2.8	14.2	1.8	8.9	块状贫有机质富硅质泥岩
⑮	LX884		2.5	3.0	7.3	30.0	26.0	0.2	2.7	18.7	17.5	纹层状富有机质钙质页岩

实验组	样品编号	岩相	柱样编号	层理面与底面方向	柱长/mm	柱直径/mm
渗吸正十二烷实验组	S4	高有机质纹层状硅质页岩	S4-HO	平行	10.67	25.23
	S1	砂质夹层	S1-HO	平行	13.98	25.19
	S1	砂质夹层	S1-VO	垂直	10.41	25.28
	S2	低有机质纹层状硅质页岩	S2-HO	平行	13.08	24.33
	S6	高有机质块状黏土质泥岩	S6-VO	垂直	11.01	25.00
	S3	低有机质纹层状硅质页岩	S3-HO	平行	12.17	25.00
	S3	低有机质纹层状硅质页岩	S3-VO	垂直	10.51	25.32
渗吸去离子水实验组	S5	高有机质块状长硅质泥岩	S5-HW	平行	19.88	25.52
	S4	高有机质纹层状硅质页岩	S4-HW	平行	10.55	25.03
	S4	高有机质纹层状硅质页岩	S4-VW	垂直	11.72	26.56
	S1	砂质夹层	S1-HW	平行	11.77	25.51
	S1	砂质夹层	S1-VW	垂直	10.53	25.82
	S2	低有机质纹层状硅质页岩	S2-HW	平行	9.10	24.43
	S6	高有机质块状黏土质泥岩	S6-VW	垂直	10.93	25.19
	S3	低有机质纹层状硅质页岩	S3-HW	平行	11.63	25.39
	S3	低有机质纹层状硅质页岩	S3-VW	垂直	11.08	25.48

样品编号			S1	S2	S3	S4	S5	S6
岩相			砂质夹层	低有机质纹层状硅质页岩	低有机质纹层状硅质页岩	高有机质纹层状硅质页岩	高有机质块状长硅质泥岩	高有机质块状黏土质泥岩
水	平行层面	P_水	0.401 3	0.401 3	—	0.322 8	—	—
	平行层面	连通性	中等	中等	—	中等	—	—
	垂直层面	T_水	0.507 6	0.503 7	0.456 2	0.976 2	1.060 4	0.267 7
	垂直层面	连通性	好-中等	中等-好	中等	好	好	中等-差
油	平行层面	P_油	0.261 6	0.237 1	—	0.273 8	—	0.661 6
	平行层面	连通性	中等-差	差	—	中等	—	好
	垂直层面	T_油	0.169 2	0.606 8	0.359 4	0.346 0	0.672 2	0.273 8
	垂直层面	连通性	差	好	中等	中等	好	中等
润湿性指数（W）			-0.198 7	0.267 3	—	-0.581 2	—	—
润湿性判断			混合，偏水润湿	混合，偏油润湿	—	水润湿	—	—

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Wettability and its major determinants of shale reservoirs in the Shahejie Formation， Dongying Sag， Bohai Bay Basin

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