鄂尔多斯盆地延长探区本溪组物源分析

樊宇洁; 孟祥振; 蒲仁海; 高小平; 强腾; 宋明

doi:10.19509/j.cnki.dzkq.tb20240191

鄂尔多斯盆地延长探区本溪组物源分析

doi: 10.19509/j.cnki.dzkq.tb20240191

1.
西北大学地质学系大陆动力学国家重点实验室，西安 710069
2.
陕西延长石油（集团）有限责任公司天然气研究院分公司，西安 710061
3.
陕西延长石油（集团）有限责任公司气田公司，陕西延安 716000

基金项目: 国家自然科学重大基金项目（41390451）；陕西省重点研发计划项目（2022GY-140）

详细信息

作者简介:
樊宇洁：E-mail：2772451055@qq.com

通讯作者:
E-mail：purenhai@126.com

中图分类号: P618
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- 文章访问数: 938
- PDF下载量: 58
- 被引次数: 0
出版历程
- 收稿日期: 2024-04-25
- 录用日期: 2024-08-07
- 修回日期: 2024-08-07
- 网络出版日期: 2024-08-07

Provenance analysis of Benxi Formation in the Yanchang exploration area of the Ordos Basin

1.
State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China
2.
Natural Gas Research Institute Branch, Shaanxi Yanchang Petroleum (Group) Co., Ltd., Xi'an, 710061, China
3.
Gas Field Company, Shaanxi Yanchang Petroleum (Group) Co., Ltd., Yan'an Shaanxi 716000, China

More Information

Author Bio:
E-mail：2772451055@qq.com

Corresponding author: E-mail：purenhai@126.com

摘要

摘要:
碎屑物质来源是控制鄂尔多斯盆地延长探区内本溪组砂岩储层发育和展布的重要因素之一。对延长探区内37口井砂岩和泥岩样品开展了碎屑锆石U-Pb年龄、重矿物组合、微量元素以及砂砾岩粒径统计等分析，揭示了本溪组碎屑物质的主要来源和搬运方向。研究表明探区内延528井的1912 Ma和2425 Ma 2个年龄峰值与华北克拉通北缘相对应，其他5口井的年龄峰值段435～447 Ma和952～976 Ma则与北秦岭的年龄峰值相对应，据此可将探区内物源划分为NE和S部2个方向。通过锆石、电气石和金红石等重矿物，可将S部物源进一步划分为WS和ES 2个方向；与重矿物分析结果相对应，在微量元素锆铌比分析中，存在WS陇东地区和ES豫西地区2个方向的物源；对砂砾岩粒径在平面上分布特征的显示，研究区存在来自ES方向的物源。综合分析可得，延长探区本溪组总体上可划分为NE、WS和ES 3个物源区，分别指示了盆地北缘阴山、盆地南缘祁连山和北秦岭东段剥蚀区，其中ES方向物源距延长探区最近，对探区影响较大。该成果探明了研究区内的3个物源方向以及其影响区域，对延长探区本溪组砂体分布预测和沉积相划分具有重要的参考意义。
- 本溪组 /
- 沉积物源 /
- 锆石 /
- 重矿物 /
- 微量元素 /
- 砾径 /
- 鄂尔多斯盆地 /
- 延长探区
Abstract:
Objective
The provenance of detritus plays a vital role in controlling the development and spatial distribution of the Benxi Formation sandstone reservoir within the Yanchang exploration area.
Methods
Based on previous research, this study employed four provenance analysis methods, including detrital zircon U-Pb ages, heavy mineral assemblages, trace elements, and statistical analysis of sandstone gravel size, applied to sand and mudstone samples from 37 wells in the Yanchang exploration area.
Results
The zircon U-Pb age populations exhibited peaks at approximately 1912 Ma and 2425 Ma, corresponding to the northern edge of the North China Craton. Additionally, peaks at 435−447 Ma and 952−976 Ma from five wells are linked to the North Qinling Mountains. Based on these findings, the provenance of sedimentary rocks can be divided into two primary directions: north and south. Furthermore, heavy mineral assemblage analysis showed higher zircon and tourmaline contents in the southwest region. At the same time, rutile was more abundant in the southeast, indicating that the southern source area can be subdivided into the southwest and southeast. Corresponding trace element analysis, notably the Zr/Nb values, supported these divisions, indicating two provenance directions of southwest Longdong and southeast Yuxi. Additionally, the spatial distribution of sandstone gravel diameters indicated a southeast source within the study area.
Conclusion
Comprehensive analysis reveals that the provenance of the Benxi Formation in the Yanchang exploration area stems from three main source regions: northeast (northern basin margin), southwest (Qilian Mountains), and southeast (North Qinling Mountains). The southeastern source is the closest and contributes the most sediments. This study illustrates the three provenance areas of the Benxi Formation and their influence zones, which are significant for predicting the distribution of sand bodies and delineating sedimentary facies in the Yanchang exploration area.
- Benxi Formation /
- sediment provenance /
- zircon /
- heavy mineral /
- trace element /
- gravel size /
- Ordos Basin /
- Yanchang exploration area

HTML全文

图 1 鄂尔多斯盆地延长探区的地理位置图(a)^[7]及样品点位分布图(b)

Figure 1. Geographical location map of the Yanchang exploration area in the Ordos Basin(a) and sample point distribution map(b)

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图 2 鄂尔多斯盆地延长探区地层综合柱状图^[1]

Figure 2. Comprehensive stratigraphic bar chart of the Yanchang exploration area in the Ordos Basin

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图 3 研究区代表性碎屑锆石阴极发光图像

Figure 3. Representative cathodoluminescence images of detrital zircons in this study

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图 4 研究区东部本溪组锆石物源数据分析图

Figure 4. Analysis of zircon source data in the Benxi Formation in the eastern part of the study area

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图 5 潜在物源年龄谱^[18]

Figure 5. Potential source age spectrum

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图 6 研究区重矿物组合类型(a)与重矿物ZTR值平面分布特征图(b)

Figure 6. Types of heavy mineral assemblages in the study area (a) and the planar distribution characteristics of the ZTR index of heavy minerals (b)

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图 7 延长探区本溪组的La-Th-Sc (a)和Th-Sc-Zr/10图解(b)^[22]

Figure 7. Diagram of La-Th-Sc (a) and Th-Sc-Zr/10 (b) in the Benxi Formation of the Yanchang exploration area

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图 8 研究区本溪组泥岩及邻区不同岩体稀土元素配分模式图

Figure 8. REE distribution patterns of mudstone and various rock masses of the Benxi Formation in the study and adjacent areas

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图 9 本溪组不同岩性的Zr-Nb图解

Figure 9. Intersection of Zr and Nb element contents across different rock types in the Benxi Formation

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图 10 研究区及周边附近本溪组取心岩石粒度分布

Figure 10. Particle size distribution map of core rocks from the Benxi Formation in the study area and surrounding regions

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图 11 鄂尔多斯盆地本溪组沉积期古地理背景^[32](a)与延长气田内的物源区分布示意图(b)

Figure 11. Paleogeographic background during the sedimentation of the Benxi Formation in the Ordos Basin (a) and distribution of source areas in the Yanchang Gas Field (b)

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表 1 研究区采样井名、岩性和分析

Table 1. List of sampling well names, lithology, and analysis items in the study area

分析项目	岩性	样品数量/个	井名
重矿物	砂岩	17	延505，延873，延877，延2104，延2126，延582，延1521，延752，延528，延419，长106，延1051，试8，延349，延1706，延304，延350
碎屑锆石	砂岩	6	延349，延528，延1051，延1706，延304，试8
微量元素	泥岩	12	试8，延1051，延1057，延1059，延1706，延349，延505，延528，延838，延975，延2104，延2126
碎屑粒径	砂岩	20	延744，延500，延600，延505，延1123，延885，延1057，延1003，延1077，延1126，延1116，延1138，延851，延1083，延1088，延1109，延2046，延864，延349，试8

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表 2 研究区东部本溪组锆石年龄分析表

Table 2. Zircon age analysis in the Benxi Formation in the eastern part of the study area

取样井位	有效数据点/个	年龄变化范围/Ma	分组/Ma	峰值年龄/Ma	皓石数量/颗	百分比/%
试8井	96	422～3617	326～530	447	30	31.2
			549～1462	976	35	36.5
			1518～3615	2470	31	32.7
延349井	88	418～3120	414～496	447	33	34.4
			502～1458	976	38	39.6
			1589～3120	2470	23	26.0
延304井	96	424～3217	407～673	444	49	51.0
			869～1595	971	18	18.8
			1728～3204	2477	29	30.2
延1051井	96	422～3230	421～465	435	32	33.3
			735～1932	971	42	43.8
			2115～3210	2487	22	22.9
延1706井	96	390～3627	375～669	447	30	31.3
			777～2042	952	39	40.6
			2302～3621	2458	27	28.1
延528井	96	265～2651	265～467	307，398	13	13.5
			1473～2651	1912，2425	77	80.2
			963～1344	未形成年龄峰值	6	6.3

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表 3 研究区本溪组重矿物质量对比

Table 3. Comparison of heavy mineral in the Benxi Formation the study area

样品井位	陆源重矿物质量/mg
样品井位	锆石	电气石	石榴石	磷灰石	磁铁矿	白钛石	金红石	锐钛矿
延505井	54.39	31.84	—	1.03	0.61	4.11	42.08	72.87
延873井	66.79	8.26	—	—	1.4	56.78	14.41	4.73
延877井	—	0.01	—	—	0.02	—	—	—
延2104井	62.83	57.25	—	—	—	60.32	25.13	294.06
延2126井	26.65	93.53	—	—	—	26.65	79.96	53.3
延349井	0.59	0.79	—	0.1	—	0.1	2.23	11.39
延528井	17.34	—	21.97	—	—	21.97	5.78	16.19
延1051井	7.69	7.69	—	—	—	6.18	18.09	19.45
延1706井	3.17	1.06	—	—	—	2.11	7.4	12.69
延304井	18.68	1.25	—	—	—	24.91	49.81	83.43
试8井	1.44	0.48	—	—	—	2.08	1.92	14.24
延752井	7.82	1.12	—	—	—	1.12	—	—
延582井	3.79	1.19	—	0.96	—	7.45	1.37	3.79
延419井	17.82	3.56	—	—	—	14.25	39.2	7.13
延1521井	6.21	1.94	—	—	—	1.94	4.66	7.37
延350井	1.90	0.17	—	—	—	0.52	3.11	0.35
长106井	1.2	0.68	—	—	—	0.85	5.98	1.37

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