Characterization of shale in the Member 3 of Dongying Formation of Nanpu sag: implications for palaeoenvironment and organic matter accumulation mechanism

doi:10.7605/gdlxb.2025.066

Journal of Palaeogeography（Chinese Edition） ›› 2025, Vol. 27 ›› Issue (5): 1157-1172. doi: 10.7605/gdlxb.2025.066

• PALAEOGEOGRAPHY AND MINERAL RESOURCES • Previous Articles Next Articles

Characterization of shale in the Member 3 of Dongying Formation of Nanpu sag: implications for palaeoenvironment and organic matter accumulation mechanism

MENG Lingjian¹^,²(), LEI Chuang³(), ZHANG Yunfeng¹, ZOU Juan², YANG Rongchao², GAO Yongliang²

1 College of Geosciences, Northeast Petroleum University, Heilongjiang Daqing 163318, China
2 Research Institute for Exploration and Development, PetroChina Jidong Oilfield Company, Hebei Tangshan 063004, China
3 College of Mining Engineering, North China University of Science and Technology, Hebei Tangshan 063210, China

Received:2024-10-10 Revised:2024-12-17 Online:2025-10-01 Published:2025-09-30
Contact: LEI Chuang,born in 1985,is a lecturer. He is mainly engaged in hydrocarbon geochemistry and hydrocarbon accumulation mechanism. E-mail: leichuang119@163.com.
About author:
MENG Lingjian,born in 1980,is a senior engineer. He is mainly engaged in comprehensive research of hydrocarbon exploration geology. E-mail: menglingjian2008@petroChina.com.cn.
Supported by:
Major Science and Technology Project of China Petroleum Corporation(2023YQX20107); Science and Technology Planning Project of Tangshan City,China(22130213H); Liaoning Key Laboratory of Green Development of Mineral Resources,China(LNTU/GDMR-2316)

南堡凹陷东营组三段页岩特征及其对古环境和有机质富集的启示^*

孟令箭¹^,²(), 雷闯³(), 张云峰¹, 邹娟², 杨荣超², 高永亮²

1 东北石油大学地球科学学院, 黑龙江大庆 163318
2 中国石油冀东油田勘探开发研究院, 河北唐山 063004
3 华北理工大学矿业工程学院, 河北唐山 063210

通讯作者: 雷闯,男,1985年生,讲师,研究方向为油气地球化学、油气成藏机理。E-mail: leichuang119@163.com。
作者简介:
孟令箭,男,1980年生,高级工程师,研究方向为油气勘探地质综合研究。E-mail: menglingjian2008@petroChina.com.cn。
基金资助:
*中国石油股份公司重大科技专项子课题(2023YQX20107); 唐山市科技计划项目(22130213H); 辽宁省矿产资源绿色开发重点实验室开放课题(LNTU/GDMR-2316)

Abstract

Abstract:

To evaluate the shale oil exploration potential of the member 3 of the Paleogene Dongying Formation(Ed₃)in the Nanpu sag,this study investigates paleoclimate and paleoenvironmental variations and their impacts on organic matter accumulation through mineralogical and geochemical analyses of 21 shale samples. Results reveal strong heterogeneity in the Ed₃ shale,with TOC ranging from 0.30% to 2.66%,S₁+S₂ from 0.44 to 11.41mg/g,and HI from 57 to 466mg/g TOC,predominantly characterized by Type II kerogen at low to mature thermal maturity stages. Multiple geochemical proxies indicate that a semi-humid to semi-arid paleoclimate during the Ed₃ deposition influenced palaeoenvironmental fluctuations. From bottom to top,paleowater depth transitioned from shallow to deep and back to shallow,paleosalinity shifted from brackish to fresh and back to brackish,and redox conditions evolved from weakly oxidizing to weakly reducing and back to weakly oxidizing. These environmental fluctuations controlled differential organic matter accumulation. Under humid climates,high paleoproductivity and anoxic conditions in deeper waters promoted efficient organic matter burial and enrichment. Conversely,under arid climates,moderate paleoproductivity and oxic conditions in shallower waters resulted in lower organic matter burial and enrichment. The established model of organic-rich mudstone development provides a foundation for selecting favorable lacustrine shale oil exploration intervals.

Key words: shale oil, palaeoclimate, palaeoenvironment, organic matter accumulation, Dongying Formation, Nanpu sag, Bohai Bay Basin

摘要： 为查明南堡凹陷古近系东营组三段(东三段)页岩油勘探潜力,基于21个页岩样品矿物学和地球化学研究,剖析了古气候和古环境变化过程及其对有机质富集的影响。结果表明,南堡凹陷东三段页岩非均质性较强,TOC介于0.30%~2.66%之间,S₁+S₂介于0.44~11.41 mg/g之间,HI介于57~466 mg/g TOC之间,以Ⅱ型干酪根为主,处于低成熟至成熟演化阶段。根据多种特征参数的垂向变化趋势,认为南堡凹陷东三段沉积时期,半湿润至半干旱交替型古气候影响着古湖泊环境波动变化,自下而上古水深经历了较浅水→较深水→较浅水、古盐度经历了半咸水→淡水→半咸水、古氧化还原条件经历了弱氧化→弱还原→弱氧化,上述的波动变化影响着有机质差异富集。在偏湿润气候下,水体古生产力高且以较深水的贫氧环境为主,有机质埋藏率高,导致沉积物中有机质富集程度高; 而在偏干旱气候下,水体古生产力中等且以较浅水的富氧环境为主,有机质埋藏率低,导致沉积物中有机质富集程度低。由此建立的富有机质页岩发育模式,可为湖相页岩油有利勘探层段选择提供依据。

关键词: 页岩油, 古气候, 古环境, 有机质富集, 东营组, 南堡凹陷, 渤海湾盆地

CLC Number:

P531

MENG Lingjian, LEI Chuang, ZHANG Yunfeng, ZOU Juan, YANG Rongchao, GAO Yongliang. Characterization of shale in the Member 3 of Dongying Formation of Nanpu sag: implications for palaeoenvironment and organic matter accumulation mechanism[J]. Journal of Palaeogeography（Chinese Edition）, 2025, 27(5): 1157-1172.

孟令箭, 雷闯, 张云峰, 邹娟, 杨荣超, 高永亮. 南堡凹陷东营组三段页岩特征及其对古环境和有机质富集的启示^*[J]. 古地理学报, 2025, 27(5): 1157-1172.

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References 44

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样品编号	深度/m	层位	矿物组分/%
样品编号	深度/m	层位	石英	长石	方解石	白云石	黏土矿物	黄铁矿	石盐
1	3720.0	Ed₃u	41.6	13.3	8.5	7.6	28.0	0	1.0
2	3747.0	Ed₃u	46.2	18.1	9.5	9.2	17.0	0	0
3	3760.0	Ed₃u	38.6	8.7	8.2	9.0	30.9	0	3.6
4	3785.0	Ed₃u	35.2	13.0	11.7	7.7	30.9	0	1.5
5	3867.0	Ed₃u	37.2	11.8	13.4	5.0	30.6	0	2
6	3880.0	Ed₃u	43.5	11.2	13.7	10.1	21.5	0	0
7	3920.0	Ed₃u	36.0	11.1	13.1	5.4	33.2	0	1.2
8	3965.0	Ed₃u	44.3	24.5	7.1	4.6	19.5	0	0
9	3975.0	Ed₃u	42.5	23.5	6.4	6.1	21.5	0	0
10	4060.0	Ed₃l	37.8	20.1	5.5	5.1	31.5	0	0
11	4070.0	Ed₃l	40.4	10.4	6.6	3.6	37.4	1.6	0
12	4083.0	Ed₃l	37.4	13.0	6.6	5.0	35.7	2.3	0
13	4090.2	Ed₃l	39.8	12.7	6.1	5.4	34.1	1.9	0
14	4092.5	Ed₃l	44.5	13.8	5.0	3.3	31.4	2.0	0
15	4100.0	Ed₃l	44.1	7.7	7.6	4.7	35.9	0	0
16	4120.0	Ed₃l	34.4	11.6	7.2	10.6	36.2	0	0
17	4170.0	Ed₃l	39.4	9.8	8.3	5.5	34.3	2.7	0
18	4215.5	Ed₃l	35.5	15.1	12.0	4.0	33.4	0	0
19	4216.3	Ed₃l	40.7	9.8	9.6	6.5	31.1	2.3	0
20	4218.7	Ed₃l	36.7	7.3	9.4	5.3	40.0	1.3	0
21	4219.5	Ed₃l	43.4	8.1	10.4	6.4	30.5	1.2	0

样品编号	深度/m	层位	矿物组分/%
样品编号	深度/m	层位	石英	长石	方解石	白云石	黏土矿物	黄铁矿	石盐
1	3720.0	Ed₃u	41.6	13.3	8.5	7.6	28.0	0	1.0
2	3747.0	Ed₃u	46.2	18.1	9.5	9.2	17.0	0	0
3	3760.0	Ed₃u	38.6	8.7	8.2	9.0	30.9	0	3.6
4	3785.0	Ed₃u	35.2	13.0	11.7	7.7	30.9	0	1.5
5	3867.0	Ed₃u	37.2	11.8	13.4	5.0	30.6	0	2
6	3880.0	Ed₃u	43.5	11.2	13.7	10.1	21.5	0	0
7	3920.0	Ed₃u	36.0	11.1	13.1	5.4	33.2	0	1.2
8	3965.0	Ed₃u	44.3	24.5	7.1	4.6	19.5	0	0
9	3975.0	Ed₃u	42.5	23.5	6.4	6.1	21.5	0	0
10	4060.0	Ed₃l	37.8	20.1	5.5	5.1	31.5	0	0
11	4070.0	Ed₃l	40.4	10.4	6.6	3.6	37.4	1.6	0
12	4083.0	Ed₃l	37.4	13.0	6.6	5.0	35.7	2.3	0
13	4090.2	Ed₃l	39.8	12.7	6.1	5.4	34.1	1.9	0
14	4092.5	Ed₃l	44.5	13.8	5.0	3.3	31.4	2.0	0
15	4100.0	Ed₃l	44.1	7.7	7.6	4.7	35.9	0	0
16	4120.0	Ed₃l	34.4	11.6	7.2	10.6	36.2	0	0
17	4170.0	Ed₃l	39.4	9.8	8.3	5.5	34.3	2.7	0
18	4215.5	Ed₃l	35.5	15.1	12.0	4.0	33.4	0	0
19	4216.3	Ed₃l	40.7	9.8	9.6	6.5	31.1	2.3	0
20	4218.7	Ed₃l	36.7	7.3	9.4	5.3	40.0	1.3	0
21	4219.5	Ed₃l	43.4	8.1	10.4	6.4	30.5	1.2	0

样品编号	深度 /m	层位	TOC /%	主量元素质量分数/%								C值
样品编号	深度 /m	层位	TOC /%	SiO₂	Al₂O₃	TFe₂O₃	CaO	MgO	Na₂O	K₂O	TiO₂	C值
1	3720.0	Ed₃u	0.45	55.46	13.89	5.07	5.60	2.20	1.52	2.67	0.72	0.30
2	3747.0	Ed₃u	0.69	60.07	13.22	4.62	6.52	2.16	1.40	2.82	0.69	0.35
3	3760.0	Ed₃u	0.94	56.66	12.84	4.71	6.58	2.17	1.43	2.60	0.67	0.36
4	3785.0	Ed₃u	1.66	57.79	12.56	4.66	9.23	2.22	1.36	2.59	0.64	0.38
5	3867.0	Ed₃u	1.58	53.94	13.26	4.81	7.31	2.19	1.42	2.47	0.64	0.35
6	3880.0	Ed₃u	1.39	59.12	13.66	4.80	5.61	2.09	1.54	2.57	0.67	0.39
7	3920.0	Ed₃u	1.40	58.16	14.08	5.05	6.73	2.25	1.42	2.71	0.69	0.38
8	3965.0	Ed₃u	1.91	58.16	13.83	4.83	6.20	2.09	1.46	2.84	0.69	0.37
9	3975.0	Ed₃u	1.78	59.59	13.16	4.63	5.92	2.14	1.62	2.33	0.73	0.38
10	4060.0	Ed₃l	1.31	58.49	14.61	5.50	3.86	2.27	2.97	2.59	0.88	0.45
11	4070.0	Ed₃l	1.71	60.21	14.06	5.27	4.70	2.11	2.40	2.64	0.86	0.43
12	4083.0	Ed₃l	1.86	58.70	14.70	5.43	3.87	2.19	3.81	2.70	0.88	0.41
13	4090.2	Ed₃l	1.83	62.92	14.72	5.34	3.17	2.26	4.04	2.94	0.86	0.41
14	4092.5	Ed₃l	2.41	59.38	14.51	5.20	3.74	2.29	3.50	2.78	0.84	0.41
15	4100.0	Ed₃l	1.67	61.51	14.69	5.38	2.92	2.25	4.03	2.62	0.88	0.44
16	4120.0	Ed₃l	1.51	59.66	14.61	4.90	2.74	2.18	4.43	2.87	0.88	0.38
17	4170.0	Ed₃l	2.66	60.47	14.22	4.87	3.67	2.20	3.59	2.37	0.87	0.40
18	4215.5	Ed₃l	0.64	62.68	14.95	7.50	7.33	3.74	3.02	2.18	1.95	0.32
19	4216.3	Ed₃l	1.38	62.45	14.53	8.06	7.81	3.25	3.28	2.01	2.26	0.37
20	4218.7	Ed₃l	0.82	58.32	14.98	5.45	4.18	2.24	3.61	2.61	1.03	0.36
21	4219.5	Ed₃l	1.05	63.72	14.92	7.71	7.44	3.03	3.20	2.38	1.94	0.37
	PAAS			62.80	18.90	7.22	1.30	2.20	1.20	2.20	1.00

样品编号	深度 /m	层位	TOC /%	主量元素质量分数/%								C值
样品编号	深度 /m	层位	TOC /%	SiO₂	Al₂O₃	TFe₂O₃	CaO	MgO	Na₂O	K₂O	TiO₂	C值
1	3720.0	Ed₃u	0.45	55.46	13.89	5.07	5.60	2.20	1.52	2.67	0.72	0.30
2	3747.0	Ed₃u	0.69	60.07	13.22	4.62	6.52	2.16	1.40	2.82	0.69	0.35
3	3760.0	Ed₃u	0.94	56.66	12.84	4.71	6.58	2.17	1.43	2.60	0.67	0.36
4	3785.0	Ed₃u	1.66	57.79	12.56	4.66	9.23	2.22	1.36	2.59	0.64	0.38
5	3867.0	Ed₃u	1.58	53.94	13.26	4.81	7.31	2.19	1.42	2.47	0.64	0.35
6	3880.0	Ed₃u	1.39	59.12	13.66	4.80	5.61	2.09	1.54	2.57	0.67	0.39
7	3920.0	Ed₃u	1.40	58.16	14.08	5.05	6.73	2.25	1.42	2.71	0.69	0.38
8	3965.0	Ed₃u	1.91	58.16	13.83	4.83	6.20	2.09	1.46	2.84	0.69	0.37
9	3975.0	Ed₃u	1.78	59.59	13.16	4.63	5.92	2.14	1.62	2.33	0.73	0.38
10	4060.0	Ed₃l	1.31	58.49	14.61	5.50	3.86	2.27	2.97	2.59	0.88	0.45
11	4070.0	Ed₃l	1.71	60.21	14.06	5.27	4.70	2.11	2.40	2.64	0.86	0.43
12	4083.0	Ed₃l	1.86	58.70	14.70	5.43	3.87	2.19	3.81	2.70	0.88	0.41
13	4090.2	Ed₃l	1.83	62.92	14.72	5.34	3.17	2.26	4.04	2.94	0.86	0.41
14	4092.5	Ed₃l	2.41	59.38	14.51	5.20	3.74	2.29	3.50	2.78	0.84	0.41
15	4100.0	Ed₃l	1.67	61.51	14.69	5.38	2.92	2.25	4.03	2.62	0.88	0.44
16	4120.0	Ed₃l	1.51	59.66	14.61	4.90	2.74	2.18	4.43	2.87	0.88	0.38
17	4170.0	Ed₃l	2.66	60.47	14.22	4.87	3.67	2.20	3.59	2.37	0.87	0.40
18	4215.5	Ed₃l	0.64	62.68	14.95	7.50	7.33	3.74	3.02	2.18	1.95	0.32
19	4216.3	Ed₃l	1.38	62.45	14.53	8.06	7.81	3.25	3.28	2.01	2.26	0.37
20	4218.7	Ed₃l	0.82	58.32	14.98	5.45	4.18	2.24	3.61	2.61	1.03	0.36
21	4219.5	Ed₃l	1.05	63.72	14.92	7.71	7.44	3.03	3.20	2.38	1.94	0.37
	PAAS			62.80	18.90	7.22	1.30	2.20	1.20	2.20	1.00

样品编号	微量元素质量分数/10^-6											相关参数
样品编号	Ba	Cd	Cr	Ga	Mn	Ni	Sr	V	Zn	Co	Pb	Ba_生源	Mn/Fe	Sr/Ba	V/V+Ni
1	2103.00	0.28	88.24	14.67	546.00	36.53	279.50	75.35	369.60	15.54	24.11	2103	196.2	0.28	0.67
2	1224.00	0.25	72.87	13.91	567.80	31.82	277.40	71.36	1857.00	20.83	21.59	1224	194.2	0.23	0.69
3	1377.00	0.26	75.12	14.69	542.90	33.08	297.80	70.52	2163.00	21.72	22.17	1377	187.9	0.22	0.68
4	1194.00	0.25	78.13	16.90	534.90	32.48	361.50	65.49	1082.00	15.34	21.84	1194	173.4	0.20	0.71
5	1664.00	0.27	76.51	14.93	536.00	34.61	333.60	64.92	408.50	17.00	22.76	1664	178.2	0.20	0.65
6	1856.00	0.27	77.69	13.21	502.70	34.25	273.10	67.61	535.20	15.05	22.65	1856	161.8	0.15	0.66
7	835.00	0.28	94.17	15.09	476.20	36.79	290.90	68.98	1279.00	21.84	23.87	835	185.7	0.29	0.65
8	785.00	0.27	73.86	14.40	496.90	35.09	274.20	68.76	516.90	14.65	22.72	785	173.5	0.24	0.66
9	1400.00	0.24	78.53	14.00	462.30	31.49	281.80	77.43	1098.00	19.11	21.67	1400	173.4	0.20	0.71
10	2132.00	0.31	89.75	10.61	639.30	40.15	319.30	94.30	675.00	19.25	25.19	2132	141.7	0.15	0.70
11	1897.00	0.30	87.70	12.29	600.20	37.07	308.90	91.41	623.90	18.91	23.95	1897	153.8	0.16	0.71
12	1837.00	0.31	85.31	10.48	584.00	38.48	320.00	94.56	818.10	21.62	24.77	1837	142.8	0.17	0.71
13	1775.00	0.30	91.37	10.54	656.60	38.16	294.00	91.65	816.50	16.44	25.49	1775	143.1	0.17	0.71
14	1735.00	0.29	85.84	11.32	586.30	36.45	290.20	89.05	643.00	15.58	24.74	1735	147.3	0.17	0.71
15	2102.00	0.30	89.20	10.18	780.80	38.62	286.20	93.67	537.50	16.59	25.80	2102	133.6	0.14	0.71
16	1856.00	0.28	80.27	9.63	562.30	35.22	257.90	94.27	2547.00	20.58	23.46	1856	138.8	0.14	0.73
17	1298.00	0.28	85.32	10.56	712.10	34.61	265.80	93.28	593.80	12.95	23.34	1298	154.6	0.20	0.73
18	1003.00	0.44	106.00	17.16	914.50	54.63	429.10	221.90	4911.00	42.14	36.57	1003	227.0	0.32	0.69
19	800.00	0.48	85.00	18.55	979.60	59.07	430.20	254.70	1023.00	32.42	39.56	801	172.9	0.24	0.67
20	2151.00	0.32	86.33	12.33	577.10	39.86	310.90	109.40	745.20	18.93	26.42	2151	188.5	0.27	0.65
21	1149.00	0.46	93.19	18.06	938.20	56.70	401.00	222.10	1285.00	29.61	37.74	1149	182.1	0.27	0.69
PAAS	650.00	/	110.00	17.00	847.00	55.00	200.00	1.00	150.00	23.00	20.00

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