陆相页岩岩相非均质性及储层孔隙发育特征：以四川盆地自流井组东岳庙段页岩为例

舒志国; 舒逸; 陈绵琨; 彭伟; 刘皓天; 肖雄

doi:10.19509/j.cnki.dzkq.tb20220446

陆相页岩岩相非均质性及储层孔隙发育特征：以四川盆地自流井组东岳庙段页岩为例

doi: 10.19509/j.cnki.dzkq.tb20220446

舒志国^1,,
舒逸^2, ,,
陈绵琨²,
彭伟²,
刘皓天²,
肖雄²

1.
中国石油化工股份有限公司江汉油田分公司, 湖北潜江 433124
2.
中国石油化工股份有限公司江汉油田分公司勘探开发研究院, 武汉 430223

基金项目:

中国石油化工股份有限公司"十条龙"科研项目"复兴侏罗系陆相页岩油气藏地质评价技术" P21078-2

中国石油化工股份有限公司科研项目 P23077

详细信息

作者简介:
舒志国, E-mail: shuzg.jhyt@sinopec.com

通讯作者:
舒逸, E-mail: cugsy@sina.com

中图分类号: P618.130.2
计量
- 文章访问数: 719
- PDF下载量: 159
- 被引次数: 0
出版历程
- 收稿日期: 2022-08-15
- 录用日期: 2022-11-07
- 修回日期: 2022-10-25

Lithofacies heterogeneity and reservoir pore development characteristics of continental shale: A case study of the Dongyuemiao shale of the Ziliujing Formation in the Sichuan Basin

1.
Jianghan Oilfield Branch Company, SINOPEC, Qianjiang Hubei 433124, China
2.
Institute of Petroleum Exploration and Development, Jianghan Oilfield Branch Company, SINOPEC, Wuhan 430223, China

More Information

Author Bio:
SHU Zhiguo, E-mail: shuzg.jhyt@sinopec.com

Corresponding author: SHU Yi, E-mail: cugsy@sina.com

摘要

摘要:
继四川盆地复兴地区涪页10井取得勘探突破后, 侏罗系自流井组东岳庙段页岩油气表现出良好的勘探潜力。东岳庙段页岩发育独特的介壳灰岩夹层、黏土矿物含量高(质量分数最高可达60%), 储层孔隙类型多样, 纵向上具有很强的非均质性。以兴页X井为例, 结合测录井资料、岩心观察、氩离子抛光扫描电镜等技术手段, 重点剖析了东岳庙段陆相页岩岩相特征及其孔隙发育特征。建立了"夹层+矿物三端元"的陆相页岩岩相划分原则, 将东岳庙段陆相页岩纵向上划分为6种岩相, 即: 介屑纹夹层型黏土页岩相; 介屑纹夹层型混合页岩相; 介屑灰岩相; 粉砂介屑互层型混合页岩相; 粉砂介屑互层型黏土页岩相; 介壳韵律型混合页岩相。通过氩离子抛光扫描电镜观察发现, 该套陆相页岩具有特殊的有机黏土复合体孔, 其中介屑纹夹层型黏土页岩相有机孔类型最为发育, 而介屑灰岩相有机孔不发育, 主要发育粒内溶孔。压汞-氮气吸附联测结果显示6种岩相页岩的孔径分布无明显差异性。综合分析认为, 有机质和黏土矿物在成岩演化过程中的相互作用是东岳庙段陆相页岩孔隙发育的主要因素。
- 陆相页岩 /
- 岩相非均质性 /
- 有机黏土复合体孔 /
- 侏罗系 /
- 东岳庙段 /
- 四川盆地
Abstract: Objective
After the exploration break through of the Well Fuye 10 in the Fuxing area of the Sichuan Basin, shale oil and gas from the Dongyuemiao section of the Jurassic Ziliujing Formation showed good exploration potential. The Dongyuemiao shale is characterized by unique shell limestone interlayers, high clay mineral content (up to 60%), various reservoir pore types, and strong vertical heterogeneity.
Methods
Taking the Well Xingye X as an example, combined with logging data, core observation, argon ion polishing scanning electron microscopy (SPE), and other technical means, the lithofacies characteristics and pore development characteristics of continental shale in the Dongyuemiao section were emphatically analysed.
Results
In this study, the principle of continental shale lithofacies division of "interlayer+mineral three-terminalelements" was established, and the continental shale of the Dongyuemiao section was vertically divided into 6 lithofacies: shell rhythmic mixed shale facies, silt shell interbedded clay shale facies, silt lithic interbedded mixed shale facies, lithic limestone facies, lithic interbedded mixed shale facies, and lithic interbedded clay shale facies. Through argon ion polishing and scanning electron microscopy (SEM), it was found that this set of continental shale mainly develops special complex organic clay pores, of which the lithic interbedded clay shale facies was the most developed type of organic pore, while the lithic limestone facies organic pores were not developed, mainly develop intragranular dissolved pores. The mercury intrusion nitrogen adsorption joint measurement results revealed that there was no significant difference in the pore size distribution of the six lithofacies shales.
Conclusion
Comprehensive analysis revealed that the interaction between organic matter and clay minerals during the diagenetic evolution process was the main factor influencing the pore development of continental shale in the Dongyuemiao section.
- continental shale /
- lithofacies heterogeneity /
- organic-clay complex pore /
- Jurassic /
- Dongyuemiao section /
- Sichuan Basin
注释:

所有作者声明不存在利益冲突。

HTML全文

图 1 四川盆地构造划分(a)及研究区地理位置图(b)

Figure 1. Tectonic division of the Sichuan Basin (a) and geographical location map of the study area (b)

下载: 全尺寸图片幻灯片

图 2 研究区构造划分(a)及兴页A井侏罗系自流井组东岳庙段地层分布综合柱状图(b)

Figure 2. Structural division of the study area (a) and comprehensive histogram of stratum distribution of the Dongyuemiao section of the Jurassic Ziliujing Formation in the Well Xingye A (b)

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图 3 复兴地区兴页A井侏罗系东一亚段和东二亚段矿物成分分布图

Figure 3. Mineral composition distributions map of Jurassic Dong-1 and Dong-2 of the Well Xingye A in the Fuxing area

下载: 全尺寸图片幻灯片

图 4 复兴地区兴页X井侏罗系东一亚段①小层韵律型介壳夹层分布示意图

Figure 4. Distribution diagram of the rhythmic shell interlayer in small layer ① of Jurassic Dong-1 of the Well Xingye X in the Fuxing area

下载: 全尺寸图片幻灯片

图 5 复兴地区兴页A井侏罗系东一亚段和东二亚段岩心照片

Figure 5. Core photos of Jurassic Dong-1 and Dong-2 of the Well Xingye A in the Fuxing area

下载: 全尺寸图片幻灯片

图 6 侏罗系陆相页岩矿物三端元图及岩相划分标准

Figure 6. Mineral ternary diagram and lithofacies classification standard of Jurassic continental shale

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图 7 复兴地区兴页X井侏罗系东一亚段岩相划分综合柱状图

Figure 7. Lithofacies division comprehensive histogram of Jurassic Dong-1 of the Well Xingye X in the Fuxing area

下载: 全尺寸图片幻灯片

图 8 复兴地区侏罗系东岳庙段6种岩相孔隙发育特征图版

Figure 8. Development characteristics of six kinds of lithofacies pores in the Jurassic Dongyuemiao section in the Fuxing area

下载: 全尺寸图片幻灯片

图 9 复兴地区侏罗系东岳庙段6种岩相孔径发育特征对比(IUPAC.国际纯粹与应用化学联合会)

Figure 9. Comparison of the development characteristics of six kinds of lithofacies pore diameters in the Jurassic Dongyuemiao section in the Fuxing area

下载: 全尺寸图片幻灯片

图 10 复兴地区侏罗系东岳庙段6种岩相孔隙度和w(TOC), 黏土矿物质量分数相关性图

Figure 10. Correlation diagram of six kinds of lithofacies porosities and TOC, clay minerals content in the Jurassic Dongyuemiao section in the Fuxing area

下载: 全尺寸图片幻灯片

图 11 介屑纹夹层型黏土页岩相不同TOC含量样品有机黏土复合体孔发育特征对比

Figure 11. Comparison of pore development characteristics of the organic clay complex in the different TOC content samples of the interlayer clay shale facies

下载: 全尺寸图片幻灯片

图 12 龙马溪组海相页岩和东岳庙段陆相页岩有机孔发育特征对比

a.海相页岩沥青球粒孔；b.海相页岩气孔；c.海相页岩有机质内溶孔；d.海相页岩有机质收缩孔/缝；e.陆相页岩有机孔；f.陆相页岩有机黏土复合体孔

Figure 12. Comparison of organic pore development characteristics between marine shale of the Longmaxi Formation and continental shale of the Dongyuemiao section

下载: 全尺寸图片幻灯片

表 1 侏罗系东岳庙段一亚段和二亚段矿物成分统计

Table 1. Mineral composition statistics of the Jurassic Dong-1 and Dong-2

小层编号	黏土w_B/%		长英质w_B/%		碳酸盐w_B/%
小层编号	区间	平均值	区间	平均值	区间	平均值
①	38~49	43	21~36	32	12~39	24
②	43~60	52	24~42	33	6~29	15
③	35~57	45	14~38	29	6~68	29
④	33~56	47	24~38	31	4~34	20
⑤	19~42	28	19~41	29	14~59	41

下载: 导出CSV

表 2 侏罗系陆相页岩夹层厚度划分标准

Table 2. Interlayer thickness division standard of Jurassic continental shale

组分划分	单层厚度划分
粉砂质	≤2 mm	纹层
	(2 mm, 10 cm]	薄层
	＞10 cm	中层
介屑(壳)	≤2 mm	纹层
	(2 mm, 10 cm]	薄层
	＞10 cm	中层
肉眼不可见	隐性纹层

下载: 导出CSV

表 3 复兴地区兴页X井侏罗系东一亚段夹层分布统计

Table 3. Interlayer distribution statistics of the Jurassic Dong-1 of the Well Xingye X in the Fuxing area

夹层	①	②	③	④
纹层	154	293	141	129
薄层	54	23	10	15
中层	5	2	4	0

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