准噶尔盆地东道海子凹陷二叠系下乌尔禾组陆相页岩气形成富集条件及主控因素

王大兴; 胡海燕; 邹佳群; 王涛; 朱根根; 陈笑宇; 梁烁

doi:10.19509/j.cnki.dzkq.tb20230184

准噶尔盆地东道海子凹陷二叠系下乌尔禾组陆相页岩气形成富集条件及主控因素

doi: 10.19509/j.cnki.dzkq.tb20230184

王大兴^1a,,
胡海燕^1a, ,,
邹佳群²,
王涛^1b,
朱根根^1a,
陈笑宇^1a,
梁烁^1a

1a.
长江大学资源与环境学院, 武汉 430100
1b.
长江大学地球科学学院, 武汉 430100
2.
新疆大学地质与矿业工程学院, 乌鲁木齐 830047

基金项目:

中国石油化工股份有限公司重大科技资助项目“准噶尔盆地及周缘矿权战略选区及评价研究” P21086-4

详细信息

作者简介:
王大兴, E-mail: dax_wang@163.com

通讯作者:
胡海燕, E-mail: hyhucom@163.com

中图分类号: P618.13
计量
- 文章访问数: 227
- PDF下载量: 512
- 被引次数: 0
出版历程
- 收稿日期: 2023-04-10
- 录用日期: 2023-07-26
- 修回日期: 2023-07-05

Enrichment conditions and main controlling factors of continental shale gas in the Permian Lower Wuerhe Formation in the Dongdaohaizi Sag, Junggar Basin

WANG Daxing^{1a
,},
HU Haiyan^{1a
, ,},
ZOU Jiaqun²,
WANG Tao^1b,
ZHU Gengen^1a,
CHEN Xiaoyu^1a,
LIANG Shuo^1a

1a.
College of Resources and Environment, Yangtze University, Wuhan 430100, China
1b.
School of Geosciences, Yangtze University, Wuhan 430100, China
2.
College of Geology and Mining Engineering, Xinjiang University, Urumqi 830047, China

More Information

Author Bio:
WANG Daxing, E-mail: dax_wang@163.com

Corresponding author: HU Haiyan, E-mail: hyhucom@163.com

摘要

摘要:
为探明准噶尔盆地二叠系下乌尔禾组页岩气富集条件及主控因素, 以东道海子凹陷下乌尔禾组为研究对象, 通过野外地质观察、录井、测井、地震等资料的收集, 结合总有机碳含量测定、X衍射全岩分析、岩心观察、气体吸附(N₂、CO₂)等手段, 对下乌尔禾组页岩的分布特征、有机质发育特征、储层特征及含气性特征进行了研究。结果表明: (1)下乌尔禾组页岩总有机碳含量(w(TOC))较高, 平均1.58%;有机质类型以Ⅱ₂型和Ⅲ型为主; 镜质体反射率R_o平均1.46%, 处于成熟阶段; 烃源岩厚度平均75 m, 烃源岩较好, 生气潜力大。盆地模拟结果表明下乌尔禾组页岩含气量较好, 平均1.89 m³/t。(2)页岩储集层粒内孔和微裂缝较为发育; 气体主要吸附于微孔和介孔; 孔隙度均值6.10%, 渗透率均值为0.27×10^-3 μm², 有利于页岩气的聚集。(3)页岩黏土矿物体积分数较高, 均值29.6%, 能提供较高的比表面积, 增加页岩的气体吸附能力; 脆性矿物体积分数均值50.9%, 压裂改造性良好。(4)页岩储层压力系数较大, 均值为1.58, 具有良好的保存条件。结合区域构造—沉积环境以及地化参数的分析表明, 东道海子凹陷下乌尔禾组页岩气成藏的主控因素包括地化参数和保存条件, 其中有机质热演化成熟度高、页岩厚度大、w(TOC)高、良好的保存条件等是影响页岩气富集的关键因素。基于上述条件, 提出东道海子凹陷页岩气勘探开发有利区位于凹陷的腹部偏东北斜坡地区。该研究成果揭示了东道海子凹陷下乌尔禾组页岩气富集条件及主控因素, 对准噶尔盆地腹部地区深层油气勘探具有借鉴意义。
- 陆相页岩 /
- 页岩气富集 /
- 主控因素 /
- 下乌尔禾组 /
- 东道海子凹陷 /
- 准噶尔盆地
Abstract: Objective
To explore the enrichment conditions and main controlling factors of shale gas in the Lower Wuerhe Formation of the Permian System in the Junggar Basin, the Lower Wuerhe Formation in the Dongdaohaizi Sag was selected as the research object.
Methods
Based on the data of outcrop, core, well logging, well-calibrated seismic reflections and the technologies of total organic carbon (TOC) content determination, whole-rock X-ray diffraction, gas adsorption (N₂, CO₂), the distribution characteristics, organic matter development characteristics, reservoir characteristics, and gas bearing characteristics of the Lower Wuerhe Formation shale were studied.
Results
The results show that: (1) The organic matter of the Lower Wuerhe Formation shale is dominated by Ⅱ₂ and Ⅲ types and shows an average TOC content of 1.58%. The average vitrinite reflectance (R_o) of organic matter is 1.46%, which indicates the mature stage. The average thickness of the source rock is 75 m. Summarily, the source rock is good and has a high gas potential. The basin simulation results show an average shale gas content of 1.89 m³/t in the Lower Wuerhe Formation. (2) The pores and microfractures in shale reservoirs are highly developed, and gas is primarily adsorbed in micropores and mesopores. The average porosity and permeability are 6.10% and 0.27×10^-3 μm² respectively, which are favourable for shale gas accumulation. (3) The shale has a high clay mineral content, with an average of 29.6%, providing a significant specific surface area and enhancing the gas adsorption capacity of the shale. Additionally, the average brittle mineral content is 50.9%, indicating good frackability. (4) Moreover, the shale reservoir exhibits a relatively large pressure coefficient of 1.58, indicating the favourable conservation conditions. The analysis of the regional tectonic-sedimentary environment and geochemical parameters indicates that the main factors controlling shale gas accumulation in the Lower Wuerhe Formation of the Dongdaohaizi Sag are geochemical parameters and preservation conditions. The key factors influencing shale gas accumulation include the high thermal evolution maturity of organic matter, large shale thickness, high TOC content, and good preservation conditions. These conditions suggest that the favourable area for shale gas exploration and development in the Dongdaohaizi Sag is located in the northeastern slope area of the sag's abdomen.
Conclusion
The results of this research reveal the enrichment conditions and main controlling factors of shale gas in the Lower Wuerhe Formation in the Dongdaohaizi Sag, which has reference value for deep oil and gas exploration in the abdominal area of the Junggar Basin.
- continental shale /
- shale gas enrichment /
- main control factor /
- Lower Wuerhe Formation /
- Dongdaohaizi Sag /
- Junggar Basin
注释:

所有作者声明不存在利益冲突。

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图 1 东道海子凹陷地质构造图(a)、沉积相图(b)和二叠系综合柱状图(c)

Figure 1. Geological structure map of the Dongdaohaizi Sag(a), sedimentary facies map(b) and composite column chart of the Permian System(c)

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图 2 东道海子凹陷下乌尔禾组连井剖面图(剖面位置见图 1a)

Figure 2. Well cross-section of the Lower Wuerhe Formation in the Dongdaohaizi Sag

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图 3 研究区下乌尔禾组页岩有机碳质量分数频率直方图(a)和平面展布图(b)

Figure 3. Frequency histogram(a) and plane distribution(b) of organic carbon content in shale of the Lower Wuerhe Formation in the study area

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图 4 研究区页岩R_o平面展布图

Figure 4. R_o plane distribution of shale in the study area

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图 5 东道海子凹陷下乌尔禾组烃源岩厚度展布图

Figure 5. Distribution map of source rock thickness of the Lower Wuerhe Formation in the Dongdaohaizi Sag

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图 6 下乌尔禾组陆相页岩与龙马溪组典型海相页岩矿物组成对比图(龙马溪组海相页岩数据来自文献[26])

Figure 6. Comparison of mineral composition between continental shales of the Lower Wuerhe Formation and typical marine shales of Longmaxi Formation

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图 7 下乌尔禾组页岩w(TOC)与矿物组分的关系

Figure 7. Relationships between the TOC content and mineral components content in the Lower Wuerhe Formation shale

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图 8 东道海子凹陷下乌尔禾组页岩扫描电镜图

a.黄铁矿晶间孔，成6井，6 494.20 m；b.粒内孔，成6井，6 495.10 m；c.有机质孔，成6井，6 494.80 m；d.黏土矿物层间缝，成6井，6 499.10 m；e.微裂缝，成6井，6 495.95 m；f.粒间孔，成6井，6 497.60 m

Figure 8. Scanning electron microscope image of the Lower Wuerhe Formation shale in the Dongdaohaizi Sag

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图 9 下乌尔禾组页岩成6井全孔径分布图

Figure 9. Pore size distribution of shale in Well C6 in the Lower Wuerhe Formation

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图 10 下乌尔禾组页岩孔隙度频率分布直方图

Figure 10. Histogram of frequency distribution of shale porosity in the Lower Wuerhe Formation

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图 11 东道海子凹陷下乌尔禾组页岩孔隙度与石英体积分数以及渗透率与孔隙度的关系图(图b部分数据源于文献[19])

Figure 11. Relationship between porosity and quartz content, permeability and porosity of shale in the Lower Wuerhe Formation in Dongdaohaizi Sag

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图 12 东道海子凹陷压力系数与埋深、日产气量与压力系数关系图(部分数据来源于文献[3, 33])

Figure 12. Relationship between buried depth, total output and pressure coefficient in the Dongdaohaizi Sag

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图 13 研究区下乌尔禾组页岩热模拟气体产率图(a)和盆地模拟含气量变化图(b)

Figure 13. Thermal gas yield map(a) and gas content change map(b) of the Lower Wuerhe Formation shale in the study area

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图 14 典型盆地陆相页岩井与产气量的关系(部分数据来源于文献[3, 46])

Figure 14. Relationships between the continental shale wells and gas production in typical basins

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图 15 模拟含气量与w(TOC)关系图

Figure 15. Relationships between the gas content and TOC content

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图 16 东道海子凹陷下乌尔禾组页岩气富集区预测图

Figure 16. Prediction of shale gas enrichment area of the Lower Wuerhe Formation in the Dongdaohaizi Sag

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表 1 准噶尔盆地下乌尔禾组陆相页岩气组分与四川盆地龙马溪组典型海相页岩气组分分析对比

Table 1. Comparison of shale gas components between continental shale of the Lower Wuerhe Formation in Junggar Basin and typical marine shale of the Longmaxi Formation in Sichuan Basin

盆地名称	井号	层位	气体组成/%
盆地名称	井号	层位	CH₄	C₂H₆	C₃H₈	CO₂	N₂
四川盆地	W201井	龙马溪组	98.54	0.52	0.03	0.30	0.56
四川盆地	W203井	龙马溪组	97.93	0.54	0.04	0.92	0.54
准噶尔盆地	成6井	下乌尔禾组	96.43	0.34	0.02	1.60	1.58
注：四川盆地龙马溪组海相页岩气组分资料来自于参考文献[26]

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表 2 东道海子凹陷及邻区勘探井试气成果

Table 2. Gas test results of exploration wells in the Dongdaohaizi Sag and its adjacent areas

地区	井号	层位	井深/m	日产气量/10⁴ m³
东道海子凹陷	成6井	P₂w	6 400	3.429
东道海子凹陷	滴南8井	P₂p	3 956~3 972	0.261
克拉美丽气田	滴西5井	P₂w	3 568~3 590	2.380
克拉美丽气田	滴西17井	P₂w	3 519	2.255

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