基于烃源岩地化参数评价页岩油运聚规律

doi:10.13809/j.cnki.cn32-1825/te.2021.04.005

摘要/Abstract

摘要：

选取鄂尔多斯盆地安塞地区长7段地层烃源岩为研究对象,利用总有机碳含量测试、岩石热解和色谱质谱等技术,深入探讨页岩油在运移和聚集过程中的差异化特征。结果显示：研究区不同烃源岩生烃潜力差异较大,其中,页岩的生烃能力最强,泥质砂岩的生烃潜力最弱。泥质砂岩中游离烃含量较高是由于其接受了外来的游离烃。不同岩性中页岩油的地球化学参数分布具有差异性,其中泥质砂岩富含饱和烃组分,非烃/沥青质组分较少,而页岩和泥岩则富含非烃/沥青质组分,饱和烃组分较少。原油性质和源储厚度及物性对页岩油的排运聚对页岩油运聚具有较强的影响。小分子烃类组分和薄层烃源岩内的页岩油较易运移,大分子烃类组分和厚层烃源岩内的页岩油倾向于残留在源岩内部。

关键词: 页岩油, 饱和烃, 运聚特征, 主控因素, 安塞地区

Abstract:

Taking the source rock of Chang 7 Member in Ansai area of Ordos Basin as the research object, the differentiation characteristics of shale oil in the process of migration and accumulation are discussed in depth through a series of testing methods, such as TOC test, rock pyrolysis and chromatography-mass spectrometry. The results show that the hydrocarbon generation potential of different source rocks in the study area is quite different. The shale has the strongest hydrocarbon generation capacity, while that of the interaction layer of sandstone and mudstone is the weakest. The high content of free hydrocarbon in interaction layer of sandstone and mudstone results from the receipt of external free hydrocarbon. The distribution of geochemical parameters of shale oil in different lithology is different. Among them, the sand mud interaction layer is rich in saturated hydrocarbon but relatively poor in nonhydrocarbon and asphaltene, while the shale and the mudstone are rich in nonhydrocarbon and asphaltene but relatively poor in saturated hydrocarbon. The properties of crude oil, thickness of source reservoir and physical properties have effects on shale oil migration and accumulation. Shale oil in thin-layer source rocks and small molecular hydrocarbon components are easy to migrate. Shale oil in thick-layer source rocks and macromolecular hydrocarbon components tend to remain in the source rocks.

Key words: shale oil, saturated hydrocarbon, migration and accumulation characteristics, main control factor, Ansai area

中图分类号:

TE122.2

代波,李二党,王小军等. 基于烃源岩地化参数评价页岩油运聚规律[J]. 油气藏评价与开发, 2021, 11(4): 506-513.

Bo DAI,Erdang LI,Xiaojun WANG, et al. Evaluation of shale oil migration and accumulation rules based on geochemical parameters of source rocks[J]. Petroleum Reservoir Evaluation and Development, 2021, 11(4): 506-513.

图/表 10

图1

图2

表1

D199井不同岩性基本地化特征对比"

岩性		TOC（%）	S₁（mg/g）	S₂（mg/g）	S₁+S₂ （mg/g）	$S 1 S 1 + S 2$ （mg/g）	$S 1 TOC$ 10²（mg/g）	$S 2 TOC$ 10²（mg/g）	$S 1 + S 2 TOC$ 10²（mg/g）
页岩	最大	10.81	8.80	28.65	32.41	0.49	254.66	388.66	643.32
	最小	1.63	1.13	28.65	8.44	0.09	27.90	113.08	147.80
	平均值	4.97	5.08	11.82	16.90	0.32	136.24	256.92	393.17
泥岩	最大	9.86	7.78	12.14	17.51	0.62	249.36	274.32	530.08
	最小	1.76	0.50	4.30	4.80	0.10	27.17	123.12	177.59
	平均值	3.15	3.04	6.44	9.49	0.29	105.83	234.18	340.01
泥质砂岩	最大	2.14	5.28	4.37	8.44	0.82	544.33	204.21	732.99
	最小	0.88	2.70	0.63	3.45	0.48	190.19	60.98	280.49
	平均值	1.29	3.67	1.88	5.55	0.70	312.46	134.60	447.06

表1

图3

表2

D199井不同岩性的抽提物组成特征对比"

岩性		$抽提物岩石$ （mg/g）	重量（mg/g）				重量比（%）
岩性		$抽提物岩石$ （mg/g）	饱和烃	芳香烃	非烃	沥青	饱和烃	芳香烃	非烃+沥青
页岩	平均值	6.59	2.98	0.64	0.17	2.80	43.51	10.00	46.48
	最大	10.25	4.72	1.83	0.39	6.23	64.20	28.20	65.50
	最小	2.31	0.50	0.20	0.05	1.25	11.40	2.70	22.00
泥岩	平均值	6.65	3.17	0.92	0.33	2.23	45.81	15.45	38.74
	最大	10.36	6.83	1.81	0.97	3.53	70.80	39.50	51.40
	最小	2.13	0.41	0.11	0.05	0.57	16.00	1.40	24.50
泥质砂岩	平均值	7.64	5.20	0.45	0.25	1.75	70.58	5.72	23.72
	最大	10.11	6.19	0.98	0.59	3.34	81.20	9.70	37.20
	最小	4.64	3.67	0.28	0.06	0.61	56.30	3.40	14.00

表2

图4

表3

图5

图6

图7

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岩性		n-C_11-21	n-C_22-30	n-C_31-39	C₂₇规则甾烷	C₂₈规则甾烷	C₂₉规则甾烷
页岩	范围	46.3~50.8	44.2~48.1	4.6~5.9	22.4~25.6	30.4~34.2	43.3~44.7
页岩	平均值	48.7	45.9	5.3	23.8	32.5	43.8
泥岩	范围	41.4~46.5	48.9~52.1	4.6~6.5	21.1~23.9	27.2~35.8	43.0~51.8
泥岩	平均值	44.0	50.4	5.6	22.2	32.2	45.8
泥质砂岩	范围	48.8~54.2	41.3~46.7	4.4~4.7	19.8~21.2	35.2~39.8	40.0~45.0
泥质砂岩	平均值	51.2	44.2	4.6	20.3	37	42.3
总计	范围	41.4~54.2	41.3~48.1	4.4~5.9	19.8~25.6	27.2~39.8	40.0~51.8
总计	平均值	47.8	46.9	5.2	22.3	33.5	44.1