湘西北ZY3井五峰组页岩地球化学特征与有机质富集控制因素

doi:10.19657/j.geoscience.1000-8527.2020.06.085

现代地质 ›› 2020, Vol. 34 ›› Issue (06): 1144-1152.DOI: 10.19657/j.geoscience.1000-8527.2020.06.085

湘西北ZY3井五峰组页岩地球化学特征与有机质富集控制因素

蔺东林¹^,²^,³(), 唐书恒¹^,²^,³(), 郗兆栋¹^,²^,³, 张松航¹^,²^,³, 周淑林⁴

1.中国地质大学(北京) 能源学院,北京 100083
2.海相储层演化与油气富集机理教育部重点实验室,北京 100083
3.非常规天然气地质评价与开发工程北京市重点实验室,北京 100083
4.浙江师范大学科技馆,浙江金华 321004

收稿日期:2020-04-14 修回日期:2020-06-03 出版日期:2020-12-22 发布日期:2020-12-22
通讯作者: 唐书恒
作者简介:唐书恒,男,教授,博士生导师,1965年出生,矿产普查与勘探专业,主要从事非常规天然气地质与开发研究。Email:tangsh@cugb.edu.cn。
蔺东林,男,硕士研究生,1996年出生,地质工程专业,主要从事非常规天然气地质方面工作。Email:2392518720@qq.com。
基金资助:
国家科技重大专项“四川盆地及周缘页岩气富集规律与重点目标评价”(2017ZX05035)

Geochemical Characteristics and Controlling Factors of Organic Matter Enrichment of Wufeng Formation Shale in ZY3 Well, Northwestern Hunan Province

LIN Donglin¹^,²^,³(), TANG Shuheng¹^,²^,³(), XI Zhaodong¹^,²^,³, ZHANG Songhang¹^,²^,³, ZHOU Shulin⁴

1. School of Energy Resources, China University of Geosciences, Beijing 100083, China
2. Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism, Ministry of Education, Beijing 100083, China
3. Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development Engineering, Beijing 100083, China
4. Science and Technology Museum,Zhejiang Normal University, Jinhua, Zhejiang 321004, China

Received:2020-04-14 Revised:2020-06-03 Online:2020-12-22 Published:2020-12-22
Contact: TANG Shuheng

摘要/Abstract

摘要：

根据对湘西北ZY3井五峰组页岩中笔石化石、岩性特征、GR曲线和TOC含量分析,明确了研究区为WF2—WF3笔石带沉积时期。选取ZY3井WF2—WF3页岩笔石带20个样品进行微量元素和有机碳同位素测试,分析其在垂向上的变化特征,进而揭示湘西北五峰组页岩有机质富集的控制因素。研究结果表明:页岩中有机碳含量在WF2较低,为0.17%~0.86%,在WF3含量较高,为0.57%~2.28%。V/Cr、Ni/Co、V/(V+Ni)和U/Th值指示WF2和WF3晚期为次氧化环境,WF3早期为缺氧环境。页岩中P/Al值和Ba_xs含量指示WF2及WF3均具有相对高的古生产力水平。但TOC与P/Al值和Ba_xs之间的弱相关性而与氧化还原环境指标之间强烈的正相关性表明,有机质的富集主要受控于氧化还原环境。Ce异常和Mo/TOC值表明了波动频繁的海平面和中等—强滞留局限盆地对五峰组古氧化还原环境造成的影响。WF2由于隆后盆地形成初期海平面上升,形成次氧化环境,WF3早期海平面上升和局限滞留盆地耦合造成底层水体缺氧,WF3晚期由于湘鄂西水下高地进入隆升高峰期导致相对海平面降低,形成不利于有机质保存的次氧化环境。表明构造作用和古海平面的变化控制着氧化还原环境,进而影响着湘西北地区五峰组页岩有机质的富集。

关键词: 湘西北, 五峰组, 沉积环境, 有机质富集, 微量元素

Abstract:

Based on the analyses on graptolite, lithological characteristics, GR curve and TOC content in the Wufeng Formation (Fm.) shale in ZY3 well in northwestern Hunan, the study area clearly belongs to the sedimentary period of WF2-WF3 shale graptolite belt. 20 samples from the WF2-WF3 in ZY3 well were selected to measure their trace elements and organic carbon isotopes compositions, and their vertical variation trends to reveal the controlling factors of organic matter enrichment in the Wufeng Fm. shale in northwestern Hunan were analyzed. The results showed that the organic carbon content in the shale was lower in WF2 (0.17% to 0.86%) and higher in WF3 (0.57% to 2.28%). The V/Cr, Ni/Co, V/(V+Ni) and U/Th values indicate that WF2 and the late-stage of WF3 were suboxic, whereas the early-stage of WF3 was anoxic. The P/Al value and Ba_xs content in shale indicate that WF2 and WF3 have relatively high paleoproductivity. However, the weak correlation between TOC and P/Al values and Ba_xs content, and the strong positive TOC vs. redox environmental index correlation indicate that the organic matter enrichment is mainly controlled by redox environment. Cerium anomaly and Mo/TOC values indicate the effects of frequent sea-level fluctuations and restricted basins on the paleoredox environment of the Wufeng Formation. Due to the sea-level rise in the early-stage of back bulge basin, WF2 may have formed in a sub-oxic environment. The coupling of sea-level rise and confined retention basin in the early-stage of WF3 resulted in hypoxia in the bottom water. In the late-stage of WF3, relative sea-level dropped due to the elevation peak of the Hunan-Hubei underwater upland, resulting in a sub-oxic environment that was not permissive to organic matter preservation. The results show that the redox environment was controlled by tectonic activity and paleo-sea-level change, which further affected organic matter accumulation in the Wufeng Fm. shale.

Key words: northwestern Hunan, Wufeng Formation, depositional environment, organic matter enrichment, trace element

中图分类号:

TE132.2

蔺东林, 唐书恒, 郗兆栋, 张松航, 周淑林. 湘西北ZY3井五峰组页岩地球化学特征与有机质富集控制因素[J]. 现代地质, 2020, 34(06): 1144-1152.

LIN Donglin, TANG Shuheng, XI Zhaodong, ZHANG Songhang, ZHOU Shulin. Geochemical Characteristics and Controlling Factors of Organic Matter Enrichment of Wufeng Formation Shale in ZY3 Well, Northwestern Hunan Province[J]. Geoscience, 2020, 34(06): 1144-1152.

图/表 6

图1 研究区上奥陶统扬子地台岩相古地理图[16,17](a)和ZY3井综合柱状图(b)

Fig.1 Paleogeographic map of the Late Ordovician Yangtze region [16-17](a) and stratigraphic column of ZY3 well (b) b-1.WF3笔石带中灰黑色页岩; b-2.Anticostia uniformis Mu and Lin, in Mu et al. 1993; b-3.Appendispinograptus venustus, 附刺笔石属; b-4.Rectograptus abbreviatus Elles and Wood, 1907, 直管笔石属; b-5. WF2笔石带中灰黑色页岩

图2 湘西北ZY3井五峰组页岩古环境指标分布综合柱状图

Fig.2 Integrated histogram of paleoenvironmental index distribution of the Wufeng Fm. shale of ZY3 well in northwestern Hunan

图3 湘西北ZY3井五峰组页岩微量元素富集系数分布特征

Fig.3 Distribution features of trace elements enrichment factors in the Wufeng Fm. shale of ZY3 well in northwestern Hunan

表1 湘西北ZY3井五峰组页岩氧化还原环境指标识别结果表

Table 1 Identification results of redox index of the Wufeng Fm. shale of ZY3 well in northwestern Hunan

地层	V/Cr		Ni/Co		V/(V+Ni)		U/Th
地层	范围值	平均值	范围值	平均值	范围值	平均值	范围值	平均值
WF2	2.01~2.27	2.09	5.80~6.40	6.00	0.54~0.58	0.57	0.96~1.13	1.02
WF3	1.18~7.02	4.15	5.00~11.02	8.24	0.52~0.88	0.71	1.08~1.89	1.40

图4 湘西北ZY3井五峰组页岩 Mo-TOC 关系图

Fig.4 Mo vs. TOC relationship of the Wufeng Fm. shale of ZY3 well in northwestern Hunan

图5 古生产力和氧化还原指标与TOC之间的关系

Fig.5 Relationships of TOC versus redox condition and paleoproductivity

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湘西北ZY3井五峰组页岩地球化学特征与有机质富集控制因素

Geochemical Characteristics and Controlling Factors of Organic Matter Enrichment of Wufeng Formation Shale in ZY3 Well, Northwestern Hunan Province

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