鄂尔多斯盆地南缘泾河油田长7段烃源岩生、排烃期与油气成藏期对比

张新乐; 平宏伟; 杨鑫; 陈红汉; 李纯泉; 何发岐; 齐荣

doi:10.19509/j.cnki.dzkq.tb20220409

鄂尔多斯盆地南缘泾河油田长7段烃源岩生、排烃期与油气成藏期对比

doi: 10.19509/j.cnki.dzkq.tb20220409

1.
中国地质大学(武汉)构造与油气资源教育部重点实验室, 武汉 430074
2.
中国石化华北油气分公司, 郑州 450006

基金项目:

国家自然科学基金项目 42072176

国家自然科学基金项目 42272169

详细信息

作者简介:
张新乐, E-mail: xinle.zhang@qq.com

通讯作者:
平宏伟, E-mail: howping@qq.com

中图分类号: P618.13
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- 文章访问数: 402
- PDF下载量: 76
- 被引次数: 0
出版历程
- 收稿日期: 2022-07-26
- 录用日期: 2022-11-30
- 修回日期: 2022-11-25

Comparison of hydrocarbon generation, expulsion periods, and accumulation periods of source rocks in Member 7 of the Yanchang Formation in the Jinghe Oilfield, southern Ordos Basin

1.
Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences(Wuhan), Wuhan 430074, China
2.
SINOPEC North China Oil and Gas Company, Zhengzhou 450006, China

More Information

Author Bio:
ZHANG Xinle, E-mail: xinle.zhang@qq.com

Corresponding author: PING Hongwei, E-mail: howping@qq.com

摘要

摘要:
泾河油田位于鄂尔多斯盆地西南部，目前已发现的油气主要位于研究区东北部，前人研究表明原油主要来自延长组长7段油页岩，然而原油到底来自研究区还是其东北部盆地中心的烃源岩还未有定论，从而制约了泾河油田的下一步勘探。利用盆地模拟方法，模拟了研究区和盆地中心长7段烃源岩生、排烃史，确定了泾河油田不同构造部位长7段烃源岩的生、排烃时间，并结合流体包裹体技术厘定了延长组储层原油成藏期次。烃源岩生、排烃时间和储层原油成藏时间以及生、排烃量的计算结果显示，泾河油田长7段烃源岩对本区油气成藏贡献有限，而盆地中心烃源岩生、排烃时间与研究区油气成藏时间具有很好的对应关系，并且本区油气明显具有由东北部向西南部运移的特点。因此与普遍认为的延长组储层以近源短距离垂向运移为主的成藏特征不同，本区已发现油藏可能主要来源于其东北部盆地中心优势生、排烃区，沿走滑断裂带经历了一定距离的侧向运移后聚集成藏。研究结果可为下一步研究区有利运聚方向及成藏区带预测提供重要参考。
- 盆地模拟 /
- 流体包裹体 /
- 热史 /
- 埋藏史 /
- 油气运移 /
- 烃源岩
Abstract: Objective
Commercial oil accumulation in the Jinghe Oilfield of the Southwest Ordos Basin was primarily found in the Northeast area. Previous studies have shown that oil mainly sourced from the oil shale in Member 7 of the Yanchang Formation. However, whether the oil comes from the source rocks spatially located in the Jinghe Oilfield or the basin center has not been determined, which inhibits further exploration of the Jinghe Oilfield.
Methods
In this paper, the hydrocarbon generation and expulsion history of source rocks in Member 7 of the Yanchang Formation in different tectonic parts of the Jinghe Oilfield and in the basin center have been reconstructed through basin simulation. Then, the accumulation periods of oil in the Yanchang Formation reservoir have been identified using fluid inclusion technology.
Results
The time window comparison of the oil accumulation in reservoir and the hydrocarbon generation and expulsion of source rocks show that oil in the Jinghe Oilfield limitedly came from the source rocks beneath the Jinghe Oilfield but more widely came from source rocks in the basin center. The oil in the Jinghe Oilfield generally shows the migration direction from Northeast to Southwest.
Conclusion
Therefore, unlike the traditional model of short-distance vertical migration, a new model can be established as that, the oil in the Jinghe Oilfield mainly laterally migrated from the hydrocarbon kitchen in the basin center along the strike-slip fault belt. The research results can provide an important reference for the prediction of hydrocarbon accumulation zones in the Jinghe Oilfield.
- basin modeling /
- fluid inclusion /
- thermal evolution history /
- burial history /
- hydrocarbon migration /
- source rock
注释:

所有作者声明不存在利益冲突。

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图 1 鄂尔多斯盆地(a)泾河油田区域地质图(b)与延长组地层简表(c)

Figure 1. Regional geological map of the Jinghe Oilfield (a) in the Ordos Basin (b) and stratigraphic table of the Yanchang Formation (c)

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图 2 校正参数图

Figure 2. Calibration parameters chart

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图 3 典型井热史模拟结果

Q₄.第四系；K₁Z.志丹群；J₂a.安定组；J₂z.直罗组；J_1-2y.延安组；J₃y⁶.延长组6段

Figure 3. Thermal history simulation results of typical wells

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图 4 泾河油田长7段烃源岩镜质体反射率(a)与生烃转化率等值线图(b)

Figure 4. Isograms of vitrinite reflectance (R_o) (a) and generate rate (b) source rocks in Member 7 of the Yanchang Formation of the Jinghe Oilfield

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图 5 长7段烃源岩生烃潜力指数随R_o的变化关系

Figure 5. Variation in the hydrocarbon potential index of source rocks with R_o in source rock of Member 7 of the Yanchang Formation

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图 6 典型井长7段烃源岩转化率与R_o演化史模拟结果

Figure 6. Simulation results of the generation rate and R_o evolution in Member 7 of the Yanchang Formation for typical wells

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图 7 鄂南长7段烃源岩生烃强度图

Figure 7. Hydrocarbon generation intensity in Member 7 of the Yanchang Formation in the southern Ordos Basin

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图 8 盆地中心典型井热史模拟结果

白406井模拟结果来自文献[33]；庄10井模拟结果为本次研究成果; 地层代号图例同图 3

Figure 8. Thermal simulation results for typical wells in the center of the basin

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图 9 泾河油田烃类包裹体特征

a.穿石英裂纹中的油包裹体，泾河9井，1 053 m，透射光，50×，长8；b.与a同视域，显示黄色荧光，紫外线激发；c.穿石英裂纹中的油包裹体，泾河9井，1 052.8 m，透射光，50×，长8；d.与c同视域，显示蓝绿色荧光，紫外线激发；e.石英内裂纹中的油包裹体，泾河12井，1 227.5 m，透射光，50×，长7；f.与e同视域，显示蓝色荧光，紫外线激发

Figure 9. Characteristics of hydrocarbon inclusions in the Jinghe Oilfield

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图 10 泾河12井长8段储层(1 364.65~1 365.41 m)与油同期盐水包裹体均一温度直方图

Figure 10. Homogenization temperature histogram of oil-associated brine inclusions in the reservoir in Member 8 of the Yanchang Formation (1 364.65-1 365.41 m) in the Well Jinghe 12

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图 11 泾河油田延长组储层油气充注时期

Figure 11. Oil and gas charging period of the Yanchang Formation reservoirs of the Jinghe Oilfield

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图 12 生排烃期与成藏期对比图

Figure 12. Comparison of the hydrocarbon generation, expulsion, and accumulation phases

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图 13 泾河油田现今油质分布与推测运移方向

Figure 13. Present-day oil quality distribution and predicted oil migration direction in the Jinghe Oilfield

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表 1 泾河油田地层划分及沉积、剥蚀发育时期

Table 1. Stratigraphic sequences, deposition and denudation stages in the Jinghe Oilfield

地层				沉积时间/Ma		剥蚀时间/Ma
系	统	组	油层组	开始	结束	开始	结束
第四系				2.6^＄	0^＄
白垩系	下统	志丹群		145^＄	96^＄	96^*	2.6^*
侏罗系	中下统	安定组		164.7^#	161.2^#	161.2^*	145
		直罗组		167.7 ^#	164.7^#
		延安组		175.5^#	168	168^*	167.7
三叠系	中上统	延长组	长3	220^#	215^#	215^#	215
			长4+5	227^＄	220^#	^#	^#
			长6	237^#	227^#	^#	^#
			长7	238.5 ^#	237^#	^#	^#
			长8	240^#	238.5^#	^#	^#
			长9	241^#	240^#	^#	^#
注：＄数据来自国际地层年代表；#数据来自文献[13]；* 数据来自文献[14]

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表 2 模拟样品地球化学特征与生烃动力学参数

Table 2. Geochemical characteristics of samples and kinetic parameters of hydrocarbon generation

编号	井号	w(S₁)/ (mg·g^-1)	w(S₂)/ (mg·g^-1)	T_max/℃	w(TOC)/%	HI/ (mg·g^-1)	母质类型	R_o/%	活化能主频/ (kJ·mol^-1)	频率因子/ s^-1
1	泾河4	0.66	81.78	440	19.37	422.2	Ⅱ₁	0.76	265	10²⁰
2	泾河6	8.17	110.1	440	24.68	446.11	Ⅱ₁	0.79	265	10²⁰
3	泾河9	6.45	80.46	437	11.06	727.49	Ⅱ₁	0.60	260	10¹⁷
4	正2	3.99	74.87	430	11.49	651.61	Ⅱ₁	0.61	260	10¹⁹
5	正2	5.53	90.32	435	13.38	675.04	Ⅱ₁	0.60	260	10¹⁸
注：1，2号样品数据来源于文献[28]，3~5号样品数据来源于文献[29]

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