蒸发分馏作用对原油中金刚烷类化合物分布与组成的影响——以塔里木盆地库车坳陷羊塔克构造上的原油为例

杨茜; 包建平; 倪春华; 朱翠山

doi:10.11781/sysydz202202295

蒸发分馏作用对原油中金刚烷类化合物分布与组成的影响——以塔里木盆地库车坳陷羊塔克构造上的原油为例

doi: 10.11781/sysydz202202295

1.
油气地球化学与环境湖北省重点实验室(长江大学地球化学系), 武汉 430100
2.
中国石化石油勘探开发研究院无锡石油地质研究所, 江苏无锡 214126

基金项目:

国家自然科学基金 41772199

国家自然科学基金 41272169

详细信息

作者简介:
杨茜(1996—)，女，硕士研究生，从事油气地球化学研究。E-mail：951038594@qq.com

通讯作者:
包建平(1962—)，男，博士，教授，从事石油地质与油气地球化学科研与教学。E-mail：101064@yangtzeu.edu.cn

中图分类号: TE135.4
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- 文章访问数: 424
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- 被引次数: 0
出版历程
- 收稿日期: 2021-08-09
- 修回日期: 2022-01-05
- 刊出日期: 2022-03-28

Effect of evaporative fractionation on the distribution and composition of diamondoids in crude oils: a case study of crude oils from Yangtake structure, Kuqa Depression, Tarim Basim

1.
Hubei Key Laboratory of Petroleum Geochemistry and Environment, Geochemistry Department, Yangtze University, Wuhan, Hubei 430100, China
2.
Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China

摘要

摘要: 借助于色谱和色谱—质谱分析技术，对塔里木盆地库车坳陷羊塔克构造上两组原油中烃类组成进行了系统分析，以研究蒸发分馏作用对金刚烷类化合物分布与组成特征的影响。轻烃分析结果表明，YT5和YT101井两组原油都经历了蒸发分馏作用的改造，其中上部储层产次生凝析油，而下部储层产经蒸发分馏作用改造的残留油。相似的甾、萜烷分布与组成表明两组原油具有相同的来源。金刚烷类分析结果表明，蒸发分馏作用对次生凝析油和残留油中单金刚烷和双金刚烷系列的相对组成基本没有影响，但对它们的浓度影响显著，如次生凝析油中金刚烷类化合物的浓度远高于残留油，且单金刚烷系列浓度升高的幅度远大于双金刚烷系列，但对金刚烷类成熟度参数影响甚微。因此，金刚烷类化合物的浓度不适用于判断遭受蒸发分馏作用改造原油的成熟度，但相关成熟度参数仍能正常使用。
- 烷基单金刚烷系列 /
- 烷基双金刚烷系列 /
- 蒸发分馏作用 /
- 次生凝析油 /
- 残留油 /
- 羊塔克构造 /
- 库车坳陷
Abstract: Two sets of crude oil samples from the Yangtake structure in the Kuqa Depression of Tarim Basin were analyzed with the aid of GC and GC-MS to evaluate the effect of evaporative fractionation on the distribution and composition of diamondoid hydrocarbon in crude oils. The light hydrocarbon signatures of oils from wells YT 5 and YT 101 indicate secondary products of evaporative fractionation for the condensates from the upper reservoirs, and the oils from the lower reservoirs are residuals. Moreover, the distribution and composition of steranes and terpanes in two sets of crude oils appeared to be comparable, suggesting that these oils shared a same source. Evaporative fractionation has imperceptible effect on the distribution and relative abundance of alkyl admantanes and diamantanes, but their concentrations in secondary condensates and residual oils appeared to be significantly varied. For example, the concentration of diamondoids in secondary condensates is much higher than that in residual oils, and the increasing extent of concentration for alkyl admantanes in secondary condensates is much higher than that in residual oils. Therefore, it should be very cautious to use the concentration of diamondoids to determine the degree of maturity of crude oils if evaporative fractionation occurred. However, the effect caused by evaporative fractionation to the maturity parameters such as MAI and MDI is relatively minor and they can still be used as indicators to evaluate maturity of crude oils even with the alteration of evaporative fractionation.
- alkyl adamantanes /
- alkyl diamantanes /
- fractionation /
- secondary condensates /
- residual oils /
- Yangtake structure /
- Kuqa Depression

HTML全文

图 1 塔里木盆地库车坳陷羊塔克构造位置及取样井分布

Figure 1. Location of Yangtake structure and sampling wells, Kuqa Depression, Tarim Basin

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图 2 塔里木盆地库车坳陷羊塔克构造两组原油样品全油色谱特征

Figure 2. Gas chromatography of whole oil for two sets of crude oil samples from Yangtake structure, Kuqa Depression, Tarim Basin

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图 3 塔里木盆地库车坳陷羊塔克构造两组原油中C₆—C₈轻烃分布特征

B和Tol分别代表苯和甲苯；2-，3-mC₆和2-，3-mC₇分别代表 2-，3-甲基己烷和庚烷；mcC₅，cC₆和mcC₆分别代表甲基环戊烷、环己烷和甲基环己烷

Figure 3. Distributions of C₆-C₈ light hydrocarbons in two sets of crude oil samples from Yangtake structure, Kuqa Depression, Tarim Basin

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图 4 塔里木盆地库车坳陷羊塔克构造两组原油中萜烷系列分布特征(m/z 191)

C₁₉T-C₂₆T为三环萜烷系列；C₂₄TE为C₂₄四环萜烷；Ts和Tm分别为18α(H)和17α(H)-三降藿烷；C₂₉Ts为降新藿烷；C₂₉H-C₃₅H为藿烷系列；diaC₃₀H为C₃₀重排藿烷；G为伽玛蜡烷

Figure 4. Distribution of terpanes in two sets of crude oil samples from Yangtake structure, Kuqa Depression, Tarim Basin

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图 5 塔里木盆地库车坳陷羊塔克构造两组原油中甾烷系列分布特征(m/z 191)

C₂₁和C₂₂分别为低分子量甾烷；C₂₇R、C₂₈R和C₂₉R分别为C_27-29 5α(H)，14α(H)，17α(H)-20R甾烷；“*”和“+”分别代表C₂₇和C₂₉重排甾烷

Figure 5. Distributions of steranes in two sets of crude oil samples from Yangtake structure, Kuqa Depression, Tarim Basin

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图 6 塔里木盆地库车坳陷羊塔克构造YT101井(5 350.1~5 355.5 m)原油中烷基单金刚烷系列和烷基双金刚烷系列

A和D分别代表单金刚烷和双金刚烷；M和E分别代表甲基和乙基；DM、TM和TEM分别代表二甲基、三甲基和四甲基；c和t分别代表顺式和反式异构体

Figure 6. Alkyl adamantanes and diamantanes in crude oil from well YT101(5 350.1-5 355.5 m), Yangtake structure, Kuqa Depression, Tarim Basin

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图 7 塔里木盆地库车坳陷羊塔克构造两组原油中烷基单金刚烷系列和烷基双金刚烷系列相对组成柱状图

Figure 7. Histograms of relative abundances of alkyl adamantanes and diamantanes in two sets of crude oil samples from Yangtake structure, Kuqa Depression, Tarim Basin

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图 8 塔里木盆地库车坳陷羊塔克构造两组原油烷基单金刚烷系列和烷基双金刚烷系列中各化合物的浓度

Figure 8. Concentrations of different compounds in alkyl admantanes and diamantanes in two sets of crude oil samples from Yangtake structure, Kuqa Depression, Tarim Basin

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图 9 塔里木盆地库车坳陷羊塔克构造两组原油中不同烷基取代的金刚烷类化合物的浓度柱状图

Figure 9. Histograms of concentrations of different compounds in alkyl diamondoids in two sets of crude oil samples from Yangtake structure, Kuqa Depression, Tarim Basin

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表 1 塔里木盆地库车坳陷羊塔克构造两组原油样品全油色谱相关参数

Table 1. Gas chromatography parameters of whole oil for two sets of crude oil samples from Yangtake structure, Kuqa Depression, Tarim Basin

井号	深度/m	层位	颜色	Pr/Ph	Pr/nC₁₇	Ph/nC₁₈	nC_21^-/nC_22⁺	H/%	I/%	甲苯/nC₇	苯/nC₆
YT101	5 350.1~5 355.5	K	乳白色	2.23	0.10	0.05	3.53	20.85	3.03	1.63	4.24
YT101	5 380~5 382	K	黑色	1.85	0.10	0.05	1.02	21.13	2.50	1.98	4.88
YT5	5 310~5 315	E	乳白色	2.26	0.13	0.06	2.79	23.98	3.25	0.97	1.01
YT5	5 323.0~5 325.5	K	黑色	2.02	0.13	0.07	2.56	23.38	2.29	1.13	2.66

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表 2 塔里木盆地库车坳陷羊塔克构造两组原油中甾、萜烷生物标志物参数

Table 2. Biomarkers of steroids and terpenes in two sets of crude oil samples from Yangtake structure, Kuqa Depression, Tarim Basin

井号	深度/m	C₂₄TE/C₂₆T	C₂₉Ts/C₂₉H	diaC₃₀H/C₃₀H	G/C₃₀H	diaC₂₇/reC₂₇	diaC₂₉/reC₂₉	C₂₇R/C₂₉R	C₂₈R/C₂₉R
YT101	5 350.1~5 355.5	2.66	0.86	0.54	0.14	0.77	0.75	0.30	0.26
YT101	5 380~5 382	2.90	0.89	0.53	0.14	0.63	0.53	0.30	0.37
YT5	5 310~5 315	3.29	0.81	0.41	0.11	0.62	0.66	0.43	0.41
YT5	5 323.0~5 325.5	3.00	0.85	0.59	0.15	0.72	0.59	0.25	0.33

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表 3 塔里木盆地库车坳陷羊塔克构造两组原油中金刚烷类成熟度参数

Table 3. Maturity parameters related to diamondoids in two sets of crude oil samples from Yangtake structure, Kuqa Depression, Tarim Basin

井号	深度/m	MAI/ %	MDI/%	1, 3-/1, 2-DMA	1, 3, 5-/1, 3, 6-TMA	1, 3, 5, 7-/1, 2, 5, 7-TEMA	4, 9-/3, 4-DMD	1, 4, 9-/3, 4, 9-TMD
YT101	5 350.1~5 355.5	70.82	39.31	1.69	0.72	0.17	0.45	0.43
YT101	5 380~5 382	68.48	37.51	1.50	0.65	0.15	0.42	0.39
YT5	5 310~5 315	69.33	39.75	1.63	0.67	0.17	0.50	0.42
YT5	5 323.0~5 325.5	66.97	38.16	1.48	0.62	0.16	0.47	0.39

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