辽西低凸起JZ25-1S太古界潜山原油地球化学特征及来源分析

赵婷婷; 罗小平; 吴飘; 徐云龙; 罗健; 孙延旭

doi:10.11781/sysydz202006981

辽西低凸起JZ25-1S太古界潜山原油地球化学特征及来源分析

doi: 10.11781/sysydz202006981

赵婷婷^1,,
罗小平²,
吴飘^{2, 3},
徐云龙^{2, 3},
罗健^{3, 4},
孙延旭^{2, 3}

1.
中海石油(中国)有限公司天津分公司, 天津滨海 300450
2.
成都理工大学能源学院, 成都 610059
3.
油气藏地质及开发工程国家重点实验室, 成都 610059
4.
成都理工大学沉积地质研究院, 成都 610059

基金项目:

国家科技重大专项 2016ZX05024-003-010

中海石油（中国）有限公司科研项目 CCL2014TJXZSS0870

详细信息

作者简介:
赵婷婷(1984-), 女, 硕士, 工程师, 从事石油地质勘探研究工作。E-mail: zhaott3@cnooc.com.cn

中图分类号: TE122.11
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出版历程
- 收稿日期: 2020-06-12
- 修回日期: 2020-09-15
- 刊出日期: 2020-11-28

Geochemical characteristics and source analysis of crude oil from Archean buried hill JZ25-1S in Liaoxi Low Uplift

ZHAO Tingting^1
,,
LUO Xiaoping²,
WU Piao^{2, 3},
XU Yunlong^{2, 3},
LUO Jian^{3, 4},
SUN Yanxu^{2, 3}

1.
Tianjin Branch Company of CNOOC, Binhai, Tianjin 300450, China
2.
College of Energy, Chengdu University of Technology, Chengdu, Sichuan 610059, China
3.
State Key Laboratory of Oil and Gas Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059, China
4.
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu, Sichuan 610059, China

摘要

摘要: 为探讨辽西低凸起JZ25-1S太古界潜山原油的地球化学特征及其来源，分析了太古界潜山原油物性、族组分、稳定碳同位素、生物标志化合物分布特征并与古近系原油地球化学特征进行对比研究。该区古近系沙河街组二段和太古界潜山原油主要为轻质和中质原油；族组分具有中等饱和烃、高芳香烃、高非烃+沥青质的特征；原油碳同位素分布在-26.2‰~-24.4‰，族组分同位素分馏效应小；色谱曲线明显见到生物降解形成的“鼓包”，单高峰—后峰态为主，Pr/Ph一般在1.3左右，Pr/nC₁₇、Ph/nC₁₈均为高值；原油的甾萜烷特征表现出伽马蜡烷丰度较高、C₂₇重排甾烷和4-甲基甾烷含量中等，甲藻甾烷含量低，规则甾烷C₂₇、C₂₈、C₂₉指纹呈不对称的偏“V”或“L”型分布。但JZ25-1S-4D井和JZ25-1-10D井太古界原油与上述原油特征存在较大的差异。JZ25-1S地区古近系和太古界潜山原油主体为辽西凹陷沙三段、辽中凹陷沙一段烃源岩混合来源，其母质来源于具有一定盐度的弱还原环境，以藻类等浮游动植物输入为主，且原油成熟度较高，受生物降解严重。JZ25-1S-4D井和JZ25-1-10D井太古界潜山原油来源于辽西凹陷沙三段烃源岩，为淡水弱还原环境，原油成熟度高，受生物降解较弱。
- 地球化学特征 /
- 生物标志化合物 /
- 潜山 /
- 太古界 /
- 辽西低凸起
Abstract: The physical properties, group composition, stable carbon isotope, and biomarker compound distribution characteristics of crude oil in the Archean buried hill were studied and compared with the geochemical characteristics of Paleogene crude oil, in order to discuss the geochemical characteristics and sources of crude oil from the Archean buried hill JZ25-1S in the Liaoxi Low Uplift. The crude oil from the second member of the Paleogene Shahejie Formation and the Archean buried hill in this area are mainly light and medium crude oil. The oil has medium saturated hydrocarbon, high aromatic hydrocarbon, high non-hydrocarbon and asphaltene contents. The carbon isotopes of the crude oil are distributed between -26.2‰ and -24.4‰, and the isotopic fractionation among group components is small. The chromatographic curve clearly shows the "bulge" formed by biodegradation, the single peak and post-kurtosis state is dominant, the Pr/Ph value is generally around 1.3, and the Pr/nC₁₇, Ph/nC₁₈ values are both high. The sterane characteristics of crude oil show a high gammacerane abundance, the C₂₇ rearranged sterane and 4-methyl sterane contents are medium, the dinostane content is low, and the regular sterane C₂₇, C₂₈, C₂₉ fingerprints are partial"V" or "L" shaped. However, the characteristics of Archean crude oil from wells JZ25-1S-4D and JZ25-1-10D are quite different from the above-mentioned crude oil. Comprehensive analysis suggests that the main body of crude oil from the Paleogene and Archean buried hills in the JZ25-1S area is a mixture from the Es₃ member of the Liaoxi Sag and the Es₁ member of the Liaozhong Sag. Its parent material comes from a weakly reducing environment with moderate salinity and is mainly derived from algae and other phytoplankton. The crude oil has a high degree of maturity and is severely biodegraded. The Archean buried hill crude oil from wells JZ25-1S-4D and JZ25-1-10D is derived from the Es₃ member source rock in the Liaoxi Sag, which was deposited in a weakly reducing freshwater environment with high maturity and weak biodegradation.
- geochemical characteristics /
- biomarkers /
- buried hill /
- Archean /
- Liaoxi Low Uplift

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图 1 辽西低凸起JZ25-1S油气田区域位置及地层综合柱状图

Figure 1. Regional location and stratigraphic section of Jinzhou 25-1S oil and gas field, Liaoxi Low Uplift

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图 2 辽西低凸起JZ25-1S地区及JZ25-1-10D井原油及其族组分稳定碳同位素对比曲线

Figure 2. Stable carbon isotope correlation curves of crude oil and its group components in JZ25-1S area and JZ25-1-10D well, Liaoxi Low Uplift

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图 3 辽西低凸起JZ25-1S地区部分井及邻区原油饱和烃色谱图及甾烷m/z 217、萜烷m/z 191质量色谱图

Figure 3. Chromatograms of saturated hydrocarbons and mass chromatograms of steranes m/z 217 and terpanes m/z 191 in some wells and adjacent areas of JZ25K-1S area, Liaoxi Low Uplift

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图 4 辽西低凸起中段及两侧凹陷烃源岩萜烷m/z 191质量色谱

Figure 4. Mass chromatography of terpene m/z 191 in source rock of Liaoxi Low Uplift and both sides

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图 5 辽西低凸起JZ25-1地区油样及周缘生烃区各套烃源岩4-甲基甾烷/C₂₉规则甾烷与伽马蜡烷/C₃₀藿烷关系

Figure 5. Relationship between 4-methyl sterane/C₂₉ regular sterane and gammacerane/C₃₀ hopane in oil samples in JZ25-1 area and various sets of source rocks in surrounding hydrocarbon generation area, Liaoxi Low Uplift

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表 1 辽西低凸起JZ25-1S地区及邻区原油物性特征统计

Table 1. Physical properties of crude oil in Jinzhou 25-1S area and adjacent areas, Liaoxi Low Uplift

井名	深度/m	层位	API/(°)	相对密度(20 ℃)/(g·cm^-3)	黏度(50 ℃)/(mPa·s)	沥青质/%	胶质/%	凝固点/℃	含硫量/%	含蜡量/%	原油性质
JZ25-1S-1	1 674.0~1 703.0	E₃s₂	23.06	0.911	10.60	7.76	5.58	<-35	0.198	1.63	正常原油
JZ25-1S-1	1 641.5~1 648.5		28.12	0.883	6.29	4.17	5.13	17	0.157	10.92	正常原油
JZ25-1S-2	1 620.0~1 625.0		48.98	0.780	1.04	4.83	1.11	<-35	0.024	0.40	凝析油
JZ25-1S-3	1 671.0		22.81	0.913	25.53	6.50	7.93	-33	0.234	1.66	正常原油
JZ25-1S-3	1 690.5		18.55	0.940	80.82	11.00	7.69	<-35	0.290	1.53	重质稠油
JZ25-1S-3	1 593.0~1 598.0		22.64	0.914	26.11	9.00	7.19	-33	0.228	2.38	正常原油
JZ25-1S-3	1 670.5~1 688.0		61.94	0.727	0.56	0.07	0.08	<-35	0.008	0.13	凝析油
JZ25-1S-6	1 710.0		21.31	0.922	36.39	10.31	5.74	<-35	0.215	1.23	正常原油
JZ25-1S-7	1 697.5		25.90	0.895	13.20	5.99	7.15	7	0.166	5.75	正常原油
JZ25-1S-7	1 710.0		25.64	0.897	12.48	6.33	18.48	-18	0.183	1.72	正常原油
JZ25-1S-7	1 664.0~1 684.0		33.42	0.854	6.50	1.89	4.96	2	0.115	10.38	正常原油
JZ25-1-10D	1 885.0~1 901.0		36.15	0.840	3.65	2.00	3.97	18	0.081	16.58	正常原油
JZ25-1S-1	1 811.0~1 960.0	Ar	25.90	0.895	6.50	7.22	5.17	<-35	0.142	1.82	正常原油
JZ25-1S-2	1 737.0~2 024.0		26.25	0.893	11.73	10.75	5.79	<-35	0.182	3.46	正常原油
JZ25-1S-4D	1 920.0~2 022.0		31.52	0.864	9.03	3.75	5.35	19	0.130	23.77	正常原油
JZ25-1S-5	1 771.0~1 955.0		29.85	0.873	6.58	4.82	5.84	<-35	0.141	7.12	正常原油
JZ25-1S-7	1 820.2~1 970.0		24.85	0.901	15.04	6.01	5.88	<-35	0.180	3.20	正常原油
JZ25-1S-8	1 618.0~2 010.2		28.03	0.883	6.80	5.11	6.18	-7	0.129	1.57	正常原油
JZ25-1-10D	2 274.5~2 399.0		31.33	0.865	8.20	5.25	6.28	18	0.170	16.23	正常原油

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表 2 辽西低凸起JZ25-1S地区及JZ25-1-10D井原油族组分和碳同位素统计

Table 2. Crude oil composition and carbon isotope statistics of JZ25-1S area and JZ25-1-10D well, Liaoxi Low Uplift

井号	井段/m	层位	烷烃/%	芳烃/%	非烃/%	沥青质/%	饱/芳	δ¹³C_PDB/‰
井号	井段/m	层位	烷烃/%	芳烃/%	非烃/%	沥青质/%	饱/芳	原油	饱和烃	芳烃	非烃	沥青质
JZ25-1S-1	1 674.0~1 703.0	E₃s₂	45.11	21.26	11.21	7.76	2.12	-26.0	-27.2	-24.9	-25.0	-25.3
JZ25-1S-1	1 641.5~1 648.5	E₃s₂	61.90	16.67	8.04	4.17	3.71	-25.9	-26.7	-25.5	-25.0	-25.5
JZ25-1S-2	1 620.0~1 625.0	E₃s₂	42.60	12.99	5.14	4.83	3.28	-26.2	-27.1	-25.6	-25.4	-25.9
JZ25-1S-3	1 671.0	E₃s₂	45.50	19.50	20.75	6.50	2.33	-25.7	-26.8	-25.1	-24.6	-24.8
JZ25-1S-3	1 690.5	E₃s₂	41.50	21.50	21.50	11.00	1.93	-25.5	-26.8	-24.9	-24.2	-24.5
JZ25-1S-3	1 593.0~1 598.0	E₃s₂	44.50	19.75	21.25	9.00	2.25	-25.7	-26.5	-25.1	-24.5	-24.9
JZ25-1-10D	1 885.0~1 901.0	E₃s₂	76.50	15.00	6.00	2.00	5.10	-25.6	-26.2	-24.9	-20.7	-25.9
JZ25-1S-1	1 811.0~1 960.0	Ar	50.83	18.61	9.17	7.22	2.73	-26.1	-27.2	-25.5	-25.0	-25.4
JZ25-1S-2	1737.0~2 024.0	Ar	45.97	20.00	8.96	10.75	2.30	-26.2	-26.6	-25.5	-25.0	-25.6
JZ25-1S-4D	1 920.0~2 022.0	Ar	65.00	15.75	7.50	3.75	4.13	-24.4	-25.3	-24.5	-24.9	-25.6
JZ25-1S-8	1 618.0~2 010.2	Ar	53.49	18.82	7.80	5.11	2.84
JZ25-1-10D	2 274.5~2 399.0	Ar	72.75	15.50	7.50	5.25	4.69	-24.3	-24.9	-23.6	-20.4	-23.6

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表 3 辽西低凸起JZ25-1S地区及邻区原油饱和烃色谱、甾萜化合物参数特征

Table 3. Characteristics of saturated hydrocarbon chromatography and steroid and terpene compound parameters of crude oil in Jinzhou 25-1S area and adjacent areas, Liaoxi Low Uplift

井号	层位	井段/m	1	2	3	4	5	6	7	8	9	10	11	12	13	14
JZ25-1S-1	E₃s₂	1 641.5~1 648.5	25	1.19	4.43	3.32	0.16	0.48	1.30	1.29	0.42	0.40	0.41	0.13	1.27	0.08
JZ25-1S-1	E₃s₂	1 674.0~1 703.0	15	1.26	2.73	2.70	0.44	0.92	1.29	1.08	0.48	0.43	0.39	0.09	1.01	0.11
JZ25-1S-2	E₃s₂	1 620.0~1 625.0	17	1.09	0.72	0.56	1.62	2.38	1.37	1.30	0.42	0.52	0.54	0.12	0.95	0.12
JZ25-1S-3	E₃s₂	1 671.0	25	1.25	1.63	1.06	0.61	1.51	1.32	1.31	0.42	0.49	0.66	0.06	0.87	0.07
JZ25-1S-3	E₃s₂	1 690.5	25	1.45	2.46	1.60	0.62	1.47	1.35	1.30	0.41	0.49	0.69	0.06	0.39
JZ25-1S-3	E₃s₂	1 593.0~1 598.0	19	1.22	1.68	1.12	0.65	1.49	1.35
JZ25-1S-3	E₃s₂	1 670.5~1 688.0	17	1.12	0.87	0.62	10.34	20.89	1.80
JZ25-1-10D	E₃s₂	1 885.0~1 901.0	19	1.10	0.47	0.38	0.97	2.03	1.23	1.39	0.36	0.41	0.60	0.16	1.75
JZ25-1S-1	Ar	1 811.0~1 960.0	34	0.94	4.88	7.99	0.46	0.47	1.10	1.44	0.50	0.47	0.36	0.12	1.59	0.05
JZ25-1S-2	Ar	1 737.0~2 024.0	20	1.08	0.73	0.59	1.11	2.40	1.14	1.26	0.43	0.50	0.59	0.10	0.82	0.13
JZ25-1S-4D	Ar	1 920.0~2 022.0	17	1.10	0.47	0.32	1.06	1.70	1.62
JZ25-1S-8	Ar	1 618.0~2 010.2	23	1.12	3.16	2.37	0.49	1.25	1.46
JZ25-1-10D	Ar	2 274.5~2 399.0	17	1.10	0.50	0.38	0.92	1.63	1.49	1.18	0.49	0.46	0.44	0.04	1.72
注：1.主峰碳; 2.OEP; 3.Pr/nC₁₇; 4.Ph/nC₁₈; 5.C_21-/C₂₂₊; 6.(C₂₁+C₂₂)/(C₂₈+C₂₉); 7. Pr/Ph; 8.ααRC₂₇/C₂₉; 9.C₂₉ααS/(S+R); 10.C₂₉ββ/(αα+ββ); 11.4-甲基C₃₀甾烷/C₂₉规则甾烷; 12.伽马蜡烷/C₃₀αβ霍烷; 13.Ts/Tm; 14.25-降霍烷。

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表 4 辽西低凸起及两侧凹陷烃源岩饱和烃甾萜特征

Table 4. Characteristics of saturated hydrocarbon steroids and terpenes in source rocks of Liaoxi Low Uplift and both sides

井号	井位置	井段/m	层位	ααRC₂₇/C₂₉	C₂₉ααS/(S+R)	C₂₉ββ/(αα+ββ)	4-甲基甾烷(C₃₀)/C₂₉规则甾烷	伽马蜡烷/C₃₀αβ霍烷
JZ19-2-1	辽西凹陷	1983.7~1 983.9	Es₁	0.73	0.06	0.26	0.08	0.22
		2 490.0	Es₃^下	0.96	0.33	0.28	0.33	0.14
		3 090.0	Es₃^下	1.32	0.54	0.35	0.72	0.09
SZ29-4-1		1 875.0	Ed₃	0.24	0.21	0.29	0.46	0.13
		2 075.0	Es₁	0.74	0.07	0.23	0.15	0.27
		2 275.0	Es₃	0.47	0.28	0.30	0.32	0.17
JZ25-1-8	辽西低凸起	2 272.0~2 292.0	Es₁	2.76	0.13	0.22	0.06	0.66
JZ25-1-6	辽西低凸起	2 860.0~2 870.0	Es₃^下	1.03	0.36	0.24	0.10	0.05
JX1-1-1	辽中凹陷	2 600.0~2625.0	Ed₃	0.57	0.20	0.26	0.22	0.08
		2 925.9~2 926.3	Es₁	1.09	0.23	0.27	0.26	0.80
		2 975.0~3 000.0	Es₃^下	1.27	0.48	0.41	0.23	0.04
JX-1-1-2D		2 400.0~2 425.0	Ed₃	0.54	0.10	0.27	0.08	0.03
JX-1-1-2D		3 050.0~3 075.0	Es₃^中	1.44	0.29	0.33	0.48	0.10

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