金坛盆地始新统阜宁组四段页岩油地质条件

doi:10.13809/j.cnki.cn32-1825/te.2024.03.012

摘要/Abstract

摘要：

为评价以金坛盆地为代表的苏南新生代残留盆地非常规油气勘探潜力，以金坛盆地J9井钻井、岩心、测井及分析测试资料为基础，开展阜宁组四段岩石沉积特征、有机地球化学特征、矿物组成特征、储层特征等地质条件分析。研究结果表明：金坛盆地阜四段形成于浅湖—半深湖为主的半封闭—封闭咸化沉积环境，具有泥页岩厚度大（深凹带大于250 m）、总有机碳（TOC）含量偏低（平均为1.02%）、热演化成熟度（R_o）中低（介于0.81%~0.85%）的特征，具备一定的成烃物质基础。阜四段泥页岩发育裂缝、孔隙两类储集空间，具备良好的储集性能，同时脆性矿物含量较高，有利于后期的压裂改造。结合已有钻孔油气显示情况，认为苏南地区茅山构造推覆带前排的金坛盆地阜四段具备中低成熟度页岩油勘探潜力。

关键词: 金坛盆地, 阜宁组四段, 页岩油, 地质条件, 中低成熟度

Abstract:

This study evaluates the unconventional oil and gas exploration potential of the Cenozoic residual basins in southern Jiangsu, focusing on Jintan Basin. Utilizing a range of data sources, including drilling records, core analyses, logging data, and laboratory tests from Well-J9, we extensively analyzed the geological features of the fourth member of Funing Formation. These analyses encompass rock mineral composition, sedimentary characteristics, organic geochemical properties, and reservoir qualities. Findings indicate that the fourth member of Funing Formation was deposited in a semi-closed to closed saline sedimentary environment, predominantly characterized by shallow to semi-deep lakes. This member is marked by substantial mud shale thickness（exceeding 250 m in deep concave zones）, low organic matter abundance（average total organic carbon（TOC）of 1.02%）, and a moderate degree of thermal evolution（vitrinite reflectance（R_o）ranging from 0.81% to 0.85%）, providing a fundamental basis for shale oil hydrocarbon generation. Additionally, the presence of fractures and porous shale reservoir spaces, coupled with a high content of brittle minerals, suggests favorable conditions for the development of complex fracture networks during subsequent fracturing interventions. Considering the oil and gas shows in existing boreholes, it is posited that the fourth member of Funing Formation, particularly near the Maoshan tectonic push-over zone, holds medium to low maturity shale oil exploration potential in southern Jiangsu.

Key words: Jintan Basin, the fourth member of Funing Formation, shale oil, geological conditions, low-medium maturity

中图分类号:

TE122

臧素华,荆晓明,刘志华等. 金坛盆地始新统阜宁组四段页岩油地质条件[J]. 油气藏评价与开发, 2024, 14(3): 425-434.

Suhua ZANG,Xiaoming JING,Zhihua LIU, et al. Geological conditions for shale oil formation in the fourth member of Funing Formation of Eocene series in Jintan Basin[J]. Petroleum Reservoir Evaluation and Development, 2024, 14(3): 425-434.

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井深/m	岩性	ω（TOC）/%	（S₁+S₂）/（mg/g）	氯仿沥青“A”/%	氢指数/（mg/g）	T_max/^oC	R_o/%
981.30	深灰色泥岩	1.40	1.59	0.184	106.27	429
1 044.10	深灰色泥岩（含膏盐）	0.68	0.39	0.099	54.09	423
1 055.85	深灰色泥岩	1.08	0.44	0.036	38.36	426
1 068.10	深灰色泥岩	0.92	0.65		68.15	429
1 075.10	深灰色泥岩	1.35	0.86		60.70	430
1 081.15	深灰色泥岩	1.35	0.99	0.309	70.28	430	0.81
1 137.00	灰色泥岩（含石膏）	1.33	0.77		55.69	433
1 143.94	灰色泥岩	0.68	0.10	0.050	14.73	435
1 155.25	灰色泥岩	1.55	9.43	0.210	600.29	443	0.85
1 162.20	灰色泥岩	3.71	31.40	0.210	830.57	447
1 172.35	灰色泥岩	0.38	0.07	0.049	16.16	434
1 176.77	灰色泥岩	1.11	3.58	0.016	299.74	443
1 193.81	灰黑色泥岩	0.51	0.19	0.087	20.03	510
1 195.10	灰黑色泥岩	1.36	0.48	0.087	24.21	373
1 197.52	灰黑色泥岩（含古生物）	0.24	0.04		14.20	522
1 200.45	灰黑色泥岩	0.13	0.06		34.42	502
1 201.14	灰色泥岩	0.07	0.03		36.99	510
1 218.50	灰黑色泥岩	0.74	0.22		12.81	524
1 222.10	灰黑色泥岩	0.87	0.45	0.246	22.57	527

井深/ m	岩性	腐泥组/%			壳质组/%								镜质组/%			惰质组/%	类型指数	干酪根类型
井深/ m	岩性	浮游藻类体	腐泥无定形体	小计	树脂体	木栓质体	角质体	孢粉体	菌孢体	腐殖无定形体	底栖藻无定形体	小计	富氢镜质体	正常镜质体	小计	丝质体	类型指数	干酪根类型
1 085.15	深灰色泥岩	—	66	66	—	—	—	1	—	5	—	6	—	7	7	21	42.8	Ⅱ₁
1 152.47	灰色泥岩	—	70	70	—	—	—	2	—	3	—	5	—	8	8	17	49.5	Ⅱ₁
1 155.25	灰色泥岩	—	76	76	—	—	—	2	—	3	—	5	—	6	6	13	61.0	Ⅱ₁
1 176.77	灰色泥岩	—	77	77	—	—	—	2	—	5	—	7	—	5	5	11	65.8	Ⅱ₁
1 187.00	灰黑色泥岩	—	68	68	—	—	—	2	—	3	—	5	—	5	5	22	44.8	Ⅱ₁

深度/m	石英/%	钾长石/%	斜长石/%	方解石/%	白云石/%	石盐/%	黄铁矿/%	方沸石/%	滑石/%	石膏/%	硬石膏/%	黏土矿物/%
1 055.75	13.1	1.1	2.7	4.0	33.7	1.2	6.4	13.4		2.6		21.8
1 044.00	13.4	1.5	2.7	4.9	24.7	1.7	3.1	16.5		1.0		30.5
1 068.00	17.0	1.5	3.6	4.4	15.6	1.7	2.2	16.8		0.8		36.4
1 075.00	11.6	1.0	2.4	1.3	47.2	2.1	3.6	11.1		1.3		18.4
1 081.00	10.7	1.8	1.7	1.8	46.5	1.6	3.4	10.9		2.4		19.2
1 085.00	5.1	0.6	0.7	2.2	67.3	1.6	4.6	7.6		0.5		9.8
1 143.80	8.6	1.0	1.9	19.3	36.5	0.9	1.2	8.4		0.7		21.5
1 152.37	11.7	1.0	4.2	22.6	28.4		3.8	10.1		1.0		17.2
1 155.15	25.4	1.3	3.6	20.1	8.2		0.5			4.7	24.5	11.7
1 162.15	19.5	1.3	3.5	38.3	10.6		1.3	9.9		3.9		11.7
1 172.30	28.5	1.6	6.7	17.5	11.6		1.3	8.7		1.1		23.0
1 176.67	11.0	0.7	5.3	64.2	8.4		0.5			2.9		7.0
1 193.75	9.0	0.8	5.1	74.2			0.7			2.2		8.0
1 195.00	33.3	3.7	16.3	18.4	1.6		2.9			4.9		18.9
1 197.50	1.5	0.4	2.6	70.3	12.2				3.7	0.3		9.0
1 200.41	1.2	1.0	1.2	63.5	1.8		0.1		8.4	1.2		21.6
1 201.11	1.7	1.0	3.4	66.8	2.0		0.2			1.1		23.8
1 208.00	1.6	19.2	22.0	5.1	23.6		0.3	25.4				2.8
1 218.46	8.7	0.9		76.6	2.6		1.0			0.9		9.3
1 222.06	0.6	0.9	3.5	83.9	2.7		0.5			0.9		7.0