鄂尔多斯盆地富县地区延长组长6、长7段原油地球化学特征及油源对比

黄彦杰; 耿继坤; 白玉彬; 孙兵华; 黄礼

doi:10.11781/sysydz202002281

鄂尔多斯盆地富县地区延长组长6、长7段原油地球化学特征及油源对比

doi: 10.11781/sysydz202002281

黄彦杰^1,,
耿继坤²,
白玉彬^{1, 3, ,},
孙兵华⁴,
黄礼¹

1.
西安石油大学地球科学与工程学院, 西安 710065
2.
大庆油田有限责任公司国际勘探开发公司, 黑龙江大庆 163000
3.
陕西省油气成藏地质学重点实验室, 西安 710065
4.
延长油田股份有限公司富县采油厂, 陕西延安 716000

基金项目:

西安石油大学研究生创新与实践能力培养项目 YCS18212033

陕西省教育厅科研计划项目 18JS090

详细信息

作者简介:
黄彦杰(1995-), 男, 硕士研究生, 从事油气成藏地质学研究。E-mail: 346324589@qq.com

通讯作者:
白玉彬(1981-), 男, 博士, 副教授, 从事致密油气成藏机理及分布规律研究。E-mail: baiyubin@xsyu.edu.cn

中图分类号: TE121.11
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- 被引次数: 0
出版历程
- 收稿日期: 2019-10-23
- 修回日期: 2020-01-22
- 刊出日期: 2020-03-28

Geochemical characteristics and oil-source correlation of crude oils in 6th and 7th members of Yanchang Formation, Fuxian area, Ordos Basin

HUANG Yanjie^1
,,
GENG Jikun²,
BAI Yubin^{1, 3
, ,},
SUN Binghua⁴,
HUANG Li¹

1.
School of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an, Shaanxi 710065, China
2.
International Exploration and Development Company, Daqing Oilfield Company Ltd, Daqing, Heilongjiang 163000, China
3.
Shaanxi Key Laboratory of Petroleum Accumulation Geology, Xi'an, Shaanxi 710065, China
4.
Fuxian Oil Production Plant, Yanchang Oilfield Company Ltd, Yan'an, Shaanxi 716000, China

摘要

摘要: 运用原油物性、族组成、生物标志化合物、油—源对比等分析指标，对鄂尔多斯盆地富县地区长6、长7段原油地球化学特征和油源成因进行了分析。富县地区长6、长7段原油物理性质相似，均为低密度、低黏度的轻质原油；原油饱和烃平均质量分数为71.46%，芳烃平均质量分数为13.27%，非烃及沥青质含量相对较低；原油“饱芳比”值较高，平均值为5.43；正构烷烃呈单峰分布，低碳数占优，主峰碳为nC₁₅；生物标志化合物中C₃₀藿烷优势明显；规则甾烷构型均呈反“L”字形分布特征，以C₂₉为主；原油成熟度相近，均为成熟原油；生油母质以低等水生生物为主，含部分陆生高等植物，沉积于弱还原的淡水—微咸水陆相沉积环境；油源对比分析表明，长6、长7段原油与本区长7³亚段烃源岩亲缘关系较好，而与长7段上部暗色泥岩及湖盆中心志丹长7³亚段烃源岩对比性较差，亲缘关系不明显，因此，认为原油主要来自于本区长7³亚段烃源岩。
- 原油地球化学特征 /
- 油源对比 /
- 长6段原油 /
- 长7段原油 /
- 富县地区 /
- 鄂尔多斯盆地
Abstract: The geochemical characteristics and oil-source correlation of crude oils in the sixth (Chang 6) and seventh (Chang 7) members of Yanchang Formation in the Fuxian area of the Ordos Basin were studied based on physical properties, group composition, biomarker compounds and oil-source correlation. The Chang 6 and Chang 7 crude oils in the study area are similar in physical properties, both of which are light with a good fluidity. The average mass fraction of saturated hydrocarbons is 71.46%, the average mass fraction of aromatics is 13.27%, and the contents of non-hydrocarbons and asphaltenes are relatively low. The saturated to aromatics ratios of the crude oils are high, averaging 5.43. The n-alkane distribution is dominated by a single peak at C₁₅ and low carbon numbers. The C₃₀ hopane is prominent in biomarker compounds. The regular sterane distribution is anti-"L" type, that is, dominated by C₂₉. Both of the Chang 6 and Chang 7 crude oils are mature. The sedimentary parent material type is lower hydrobiont and contains some terrestrial higher plants, which are deposited in a weakly reduced freshwater-brine water terrestrial sedimentary environment. The oil-source correlation shows that the Chang 6 and Chang 7 crude oils are closely related to the Chang 7³ source rocks in this area; however, the relationship with the dark mudstones in the upper part of Chang 7 and the Chang 7³ source rocks in the Zhidan area in the basin center is poor. Therefore, it is believed that the crude oil is mainly from the Chang 7³ source rocks in this area.
- geochemical characteristics of crude oil /
- oil-source correlation /
- Chang 6 crude oil /
- Chang 7 crude oil /
- Fuxian area /
- Ordos Basin

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图 1 鄂尔多斯盆地富县地区地理位置及取样井位分布

Figure 1. Location and sampling wells of study area, Fuxian area, Ordos Basin

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图 2 鄂尔多斯盆地富县地区典型井烃源岩电测曲线响应

Figure 2. Petrophysical logging curves of source rocks from typical wells in Fuxian area, Ordos Basin

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图 3 鄂尔多斯盆地富县地区典型井长6、长7段原油饱和烃气相色谱

Figure 3. Gas chromatography of saturated hydrocarbons in Chang 6 and Chang 7 crude oils in Fuxian area, Ordos Basin

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图 4 鄂尔多斯盆地富县地区长6、长7段原油Pr /nC₁₇与Ph/nC₁₈值相关图

Figure 4. Correlation between Pr/nC₁₇ and Ph/nC₁₈ values of Chang 6 and Chang 7 crude oils in Fuxian area, Ordos Basin

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图 5 鄂尔多斯盆地富县地区长6、长7段原油αααC₂₉20S/(20S +20R)和C₂₉ββ/(ββ+αα)相关图

Figure 5. Correlation between αααC₂₉20S/(20S +20R) and C₂₉ββ/(ββ+αα) of Chang 6 and Chang 7 crude oils in Fuxian area, Ordos Basin

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图 6 鄂尔多斯盆地富县地区长7段烃源岩(a，b)与长6、长7段原油(c，d)生标化合物对比

Figure 6. Biomarkers of Chang 7 source rocks (a, b) and Chang 6 and Chang 7 crude oils (c, d) in Fuxian area, Ordos Basin

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图 7 鄂尔多斯盆地富县地区长6、长7段原油与长7段烃源岩及志丹地区长7³亚段烃源岩生物标志化合物特征对比

Figure 7. Biomarkers of Chang 6 and Chang 7 crude oils and Chang 7 source rocks in Fuxian area and Chang 7³ source rocks in Zhidan area, Ordos Basin

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图 8 鄂尔多斯盆地富县地区长6、长7段原油与长7段烃源岩及志丹地区长³亚段烃源岩规则甾烷含量特征对比

Figure 8. Regular sterane distributions of Chang 6 and Chang 7 crude oils and Chang 7 source rocks in Fuxian area and Chang 7³ source rocks in Zhidan area, Ordos Basin

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表 1 鄂尔多斯盆地富县地区长6、长7段原油族组分数据

Table 1. Group composition of Chang 6 and Chang 7 crude oils in Fuxian area, Ordos Basin

井名	层位	族组成/%				饱/芳比
井名	层位	饱和烃	芳烃	非烃	沥青质	饱/芳比
HP12	长6段	71.61	13.36	5.22	2.30	5.36
HP20	长6段	73.66	14.20	5.21	0.32	5.19
HP21	长6段	70.21	16.22	8.26	2.95	4.33
HP23	长6段	73.99	13.94	4.83	4.29	5.31
HP33	长6段	74.71	14.25	3.45	1.84	5.24
HP36	长6段	53.04	9.35	3.74	19.16	5.68
HP193	长6段	72.97	12.93	3.28	4.44	5.64
H238	长7段	71.71	13.49	3.95	3.29	5.32
H255	长7段	79.49	12.22	3.62	0.75	6.51
H141	长7段	73.18	12.71	2.12	0.94	5.76

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表 2 鄂尔多斯盆地富县地区长6、长7段原油与烃源岩饱和烃色谱参数

Table 2. Chromatographic parameters of saturated hydrocarbons of Chang 6 and Chang 7 crude oil and source rocks in Fuxian area, Ordos Basin

井名	层位	样品类型	CPI	OEP	nC_21^-/ nC_22⁺	(nC₂₁+nC₂₂)/ nC₂₈+nC₂₉)	Pr/ nC₁₇	Ph/ nC₁₈	Pr/Ph	主峰碳数
HP12	长6段	原油	1.07	1.04	1.43	1.67	0.34	0.38	0.94	nC₁₅
HP20	长6段	原油	1.09	1.01	1.17	1.66	0.35	0.36	0.97	nC₁₉
HP21	长6段	原油	1.06	1.03	1.57	1.96	0.30	0.29	1.09	nC₁₅
HP23	长6段	原油	1.09	1.05	1.69	1.71	0.34	0.34	1.04	nC₁₅
HP33	长6段	原油	1.09	1.05	1.52	1.54	0.37	0.40	0.97	nC₁₅
HP36	长6段	原油	1.11	1.05	1.61	1.81	0.42	0.49	0.87	nC₁₅
H193	长6段	原油	1.09	1.03	1.55	1.76	0.31	0.25	1.27	nC₁₅
H238	长7段	原油	1.11	1.04	1.80	1.97	0.33	0.30	1.16	nC₁₅
H255	长7段	原油	1.10	1.04	1.59	1.74	0.31	0.25	1.28	nC₁₅
FX141	长7段	原油	1.06	1.03	1.68	1.81	0.19	0.14	1.38	nC₁₅
FX134	长7³亚段	黑色油页岩	1.06	1.02	2.31	3.40	0.18	0.12	1.57	nC₁₆
FX134	长7³亚段	黑色油页岩	1.09	1.02	1.84	3.21	0.23	0.20	1.20	nC₁₇
FX120	长7¹亚段	暗色泥岩	1.13	1.02	0.80	1.97	0.45	0.44	0.84	nC₂₁
FX120	长7¹亚段	暗色泥岩	1.08	1.03	3.42	4.12	0.15	0.10	1.56	nC₁₅

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表 3 鄂尔多斯盆地富县地区长6、长7段原油与烃源岩萜甾类化合物特征参数统计

Table 3. Characteristic parameters of terpenoids in Chang 6 and Chang 7 crude oils and source rocks in Fuxian area, Ordos Basin

井名	层位	样品类型	A	B	C	D	E	F	G	规则甾烷相对含量/%			H	I	J
井名	层位	样品类型	A	B	C	D	E	F	G	C₂₇	C₂₈	C₂₉	H	I	J
HP12	长6段	原油	0.67	3.91	0.12	0.59	0.47	0.48	0.56	22.57	32.61	44.83	0.28	0.15	0.19
HP20	长6段	原油	0.68	2.61	0.16	0.60	0.46	0.50	0.57	23.04	32.43	44.52	0.25	0.13	0.17
HP21	长6段	原油	0.66	2.75	0.16	0.61	0.51	0.51	0.56	19.26	32.34	48.40	0.31	0.20	0.27
HP23	长6段	原油	0.66	3.47	0.13	0.59	0.45	0.49	0.57	23.16	32.05	44.79	0.29	0.14	0.19
HP33	长6段	原油	0.67	3.60	0.14	0.60	0.47	0.48	0.58	19.99	36.29	43.72	0.29	0.16	0.21
HP36	长6段	原油	0.67	1.95	0.29	0.61	0.47	0.50	0.57	19.76	36.29	43.95	0.26	0.12	0.16
H193	长6段	原油	0.65	5.90	0.12	0.62	0.35	0.49	0.56	21.51	31.10	47.40	0.30	0.16	0.21
H238	长7段	原油	0.65	4.28	0.13	0.61	0.51	0.49	0.56	23.36	31.35	45.30	0.29	0.16	0.21
H255	长7段	原油	0.66	4.98	0.11	0.62	0.42	0.49	0.57	21.80	32.57	45.64	0.26	0.15	0.19
FX141	长7段	原油	0.66	5.13	0.05	0.57	0.48	0.46	0.55	24.54	32.06	43.40	0.24	0.22	0.31
FX134	长7³亚段	黑色油页岩	0.62	4.42	0.13	0.61	0.47	0.52	0.52	31.42	32.35	36.23	0.28	0.43	0.46
FX134	长7³亚段	黑色油页岩	0.63	3.41	0.12	0.59	0.42	0.57	0.55	33.99	28.80	37.21	0.24	0.42	0.43
FX120	长7¹亚段	暗色泥岩	0.61	4.77		0.60	0.46	0.40	0.55	35.76	32.48	31.76	0.29	0.47	0.45
FX120	长7¹亚段	暗色泥岩	0.57	4.57	0.12	0.62	0.46	0.49	0.30	28.64	33.54	37.82	0.26	0.40	0.39
注：A.20RC₂₉αββ/(αββ+ααα)；B.Ts/Tm；C.伽马蜡烷指数；D.C₂₄四环萜烷/(C₂₄四环萜烷+C₂₆三环萜烷)；E.C₂₅三环萜烷/C₂₄四环萜烷；F.C₃₁霍烷22S/(22R+22S)；G.αααC₂₉20S/(20S+20R)；H.重排甾烷/规则甾烷；I.孕甾烷/规则甾烷；J.孕+升孕/规则甾烷

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