基于CDOM光谱特征的泥页岩产气特征评价

郑晓璇; 田继先; 田聪; 蒋峥文; 杨磊; 贺秋芳; 薛红蕾

doi:10.19509/j.cnki.dzkq.tb20230652

基于CDOM光谱特征的泥页岩产气特征评价

doi: 10.19509/j.cnki.dzkq.tb20230652

1.
西南大学地理科学学院/岩溶环境重庆市重点实验室, 重庆 400715
2.
中国石油勘探开发研究院, 北京 100083
3.
中国石油青海油田公司勘探开发研究院, 甘肃敦煌 736202
4.
烟台市蓬莱区农业技术推广中心, 山东烟台 265600

基金项目:

中国石油天然气股份有限公司前瞻性与基础性重大科技项目“不同类型大气田(区)成藏主控因素及邻域评价” 2021DJ0605

详细信息

作者简介:
郑晓璇, E-mail: zhengxiaoxuan08@163.com

通讯作者:
贺秋芳, E-mail: hqfeddy@swu.edu.cn

中图分类号: P618.13
计量
- 文章访问数: 205
- PDF下载量: 92
- 被引次数: 0
出版历程
- 收稿日期: 2023-11-24
- 录用日期: 2024-03-05
- 修回日期: 2024-02-25

Evaluation of the characteristics of biogenic gas production based on the CDOM spectral characteristics of shales

1.
Chongqing Key Laboratory of Karst Environment, School of Geographic Sciences, Southwest University, Chongqing 400715, China
2.
Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
3.
Research Institute of Exploration and Development, Qinghai Oilfield Company, PetroChina, Dunhuang Gansu 736202, China
4.
Yantai Penglai District Agricultural Technology Promotion Center, Yantai Shandong 265600, China

More Information

Author Bio:
ZHENG Xiaoxuan, E-mail: zhengxiaoxuan08@163.com

Corresponding author: HE Qiufang, E-mail: hqfeddy@swu.edu.cn

摘要

摘要:
泥页岩中可溶有机质(DOM)组成和可降解性是影响生物气形成的重要因素, 开发简便有效的方法来评估可溶有机质的组成、官能团特征和微生物活性等, 可为泥页岩生物气田产气机制分析提供关键的基础信息。采集了柴达木盆地涩探1井1 219~1 309 m泥质岩心, 基于有色可溶有机质(CDOM)的三维荧光(EEM)和紫外可见吸收光谱特征, 分析了可溶有机质的组分、官能团特征和易降解程度, 了解了产甲烷菌可利用底物的分布情况。结果表明: 涩探1井岩心有机质以易降解的类色氨酸荧光组分C1和C3为主, 占比70.54%;荧光组分、荧光参数HIX、BIX和＜吸光系数E₂₅₃/E₂₀₃、SUVA₂₅₄共同指示1 219~1 222 m和1 285~1 301 m 2个层位有机质腐殖化程度较低, 芳香性较弱, 为潜在的产气活跃层位。研究表明CDOM光谱可以作为分析泥页岩可溶有机质特征的有效方法, 其结果反映了产甲烷菌可利用底物和微生物活性等特征, 为烃源层系内生物产气预测提供有效的重要信息。
- 生物气 /
- 可溶有机质(DOM) /
- CDOM三维荧光光谱 /
- 紫外-可见吸收光谱 /
- 柴达木盆地 /
- 泥页岩
Abstract: Objective
The composition and degradability of dissolved organic matter (DOM) play a critical role in evaluating biogenic gas production during shale gas exploration. A simple and effective method needs to be developed to assess the composition, functional groups and microbial activity of DOM, which will provide crucial valuable information concerning the gas production mechanism in the field of biogenic shale gas.
Methods
Shale samples were collected from depths of 1 219 m to 1 309 m from the ST1 exploration well located at the edge of the Sebei No.1 gas field in the Qaidam Basin. According to the 3D fluorescence of the extraction and emission matrix (EEM) and the UV visible absorption spectrum characteristics of chromophoric dissolved organic matter (CDOM), the composition, functional group and degradation characteristics of CDOM were analysed to determine the distribution of methanol formation substrates.
Results
The DOM in the samples mainly consisted of the small molecular tryptophan-like fluorescent components C1 and C3, which are readily degradable by biotic processes and account for 70.54% of the total fluorescence intensity. The fluorescence components, fluorescence parameters (HIX, BIX), and absorbance ratios (E₂₅₃/E₂₀₃, SUVA₂₅₄) confirmed that the core layers at depths of 1 219-1 222 m and 1 285-1 301 m were potential effective gas-generating formations. These layers contain low amounts of humified organic matter, weak aromaticity and high amounts of methanol functional groups. The active gas-generating formations are generally consistent with those in previous reports.
Conclusion
The results indicated that the CDOM spectrum is a valuable method for exploring the methanol formation substrate distribution and microbial activity. The CDOM-EEM method has the potential to serve as an effective indicator of the methanol formation characteristics of DOM in mud shale and provides an effective and essential way to assess geochemical-based gas production capacity in hydrocarbon source rocks.
- biogenic gas /
- dissolved organic matter (DOM) /
- CDOM-3DEEM /
- UV visible absorption spectrum /
- Qaidam Basin /
- shale
注释:

所有作者声明不存在利益冲突。

HTML全文

图 1 柴达木盆地一级构造简图(a)与三湖地区生气区带分布和采样点区位图(b)以及采样位置测井剖面图(c)(a据文献[30]修改)

Figure 1. First-order structure diagram (a) of the Qaidam Basin, distribution of gas-bearing zones and location map of sampling sites in the Sanhu area (b) and log profile of sampling location (c)

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图 2 岩心CDOM荧光组分三维荧光图及折半检验

Figure 2. EEMs contours of the four fluorescence components identified by PARAFAC

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图 3 岩心CDOM吸收系数光谱图

Figure 3. CDOM absorption coefficient spectrogram of the rock core

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图 4 岩心TC、TOC和DOC纵向变化图

Figure 4. Systematic variation in the rock core TC, TOC, and DOC contents with depth

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图 5 荧光组分荧光强度、HIX、BIX、E₂₅₃/E₂₀₃、SUVA₂₅₄随深度系统变化

Figure 5. Systematic changes in fluorescence component intensity, HIX, BIX, E₂₅₃/E₂₀₃ and SUVA₂₅₄ with depth

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图 6 CDOM荧光组分的相对比例

Figure 6. Relative proportions of the four CDOM fluorescence components

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表 1 EEM-PARAFAC解析出4个荧光组分的特征

Table 1. Characteristics of the four fluorescence components identified by the EEM-PARAFAC model

荧光组分	E_x/nm	E_m/nm	荧光组分类型	文献报道
荧光组分	E_x/nm	E_m/nm	荧光组分类型	E_x/nm	E_m/nm	参考文献
C1	＜250	366	类色氨酸	C7:240	318	[38]
				C2:240	364	[39]
				C6:240	360	[40]
C2	260，315	430	类富里酸	C1:250	413	[41]
				C1:335	440	[42]
				C1:270(320)	411	[43]
				C2:260	400	[44]
C3	280	336	类色氨酸	C3:280	320	[45]
				C2:＜280	330	[46]
				C4:280	328	[47]
				C4:275	325	[48]
C4	345, 425, 265	509	类腐殖酸	C2:365	510	[42]
				C4:＜300	498	[49]
				C4:250~450	510	[50]
注：表中各物理量的含义见正文; E_x为激发波长；E_m为发射波长

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表 2 紫外可见光吸收光谱和三维荧光光谱参数的指示含义

Table 2. Indicators calculated from the ultraviolet visible absorption spectrum and 3D fluorescence EEMs of DOM

指数	定义	含义
HIX	激发波长254 nm时，发射波长在435~480 nm范围内荧光强度积分值与300~345 nm荧光积分值之比	有机物中腐殖质含量或腐殖化程度高低的指示剂^[5]
BIX	激发波长310 nm时，发射波长在380 nm与430 nm处荧光强度的比值	DOM中内源贡献大小的指标^[53]
E₂₅₃/E₂₀₃	253 nm波长与203 nm波长处吸收系数的比值	表征DOM苯环结构上官能团的构成特征^[54]
SUVA₂₅₄	254 nm处的CDOM吸光度与该样品溶液DOC的浓度之比	表达DOM的芳香性指标^[55]
注：HIX为腐殖化指数；BIX为自生源指数；E₂₅₃/E₂₀₃为官能团指数；SUVA₂₅₄为芳香性指数，下同

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