川东南綦江地区中侏罗统凉高山组陆相页岩油气勘探潜力分析

陈超; 刘晓晶; 刘苗苗; 陈会霞; 谢佳彤

doi:10.11781/sysydz2024051015

川东南綦江地区中侏罗统凉高山组陆相页岩油气勘探潜力分析

doi: 10.11781/sysydz2024051015

中国石化勘探分公司, 成都 610041

基金项目:

中国石化科技部“十条龙”项目 P21078-1

中国石化科技部基础研究项目 P22159

详细信息

作者简介:
陈超(1986—)，男，副研究员，从事非常规油气评价研究工作。E-mail: chenchao.ktnf@sinopec.com

中图分类号: TE122.3
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- 被引次数: 0
出版历程
- 收稿日期: 2024-03-19
- 修回日期: 2024-07-19
- 刊出日期: 2024-09-28

Oil and gas exploration potential of continental shale of Lianggaoshan Formation of Middle Jurassic in Qijiang area of southeastern Sichuan

SINOPEC Exploration Company, Chengdu, Sichuan 610041, China

摘要

摘要: 随着评价和开发技术的不断进步，陆相页岩油气已成为我国未来重要的接替能源。近期，川东南綦江地区部署的多口过路井在中侏罗统凉高山组页岩段钻遇了良好的油气显示。为明确该区页岩油气基本地质特征，以川东南綦江地区凉高山组富有机质页岩为研究对象，在岩心观察和化验分析的基础上，开展了綦江地区凉高山组二段页岩油气基础地质条件评价，并结合优质页岩地震预测、构造保存条件评价，落实了勘探潜力，指明了下一步勘探方向。以綦江典型井为例，综合有机地化特征、热演化程度、储层物性特征及含油气性特征等，对该区页岩油气进行了资源潜力分析。结果表明，綦江地区凉高山组二段下亚段优质页岩分布面积大，达4 569 km²，厚度20~39 m，受半深湖相控制，有机碳含量平均为1.3%~1.6%，有机质类型以Ⅱ₁—Ⅱ₂为主，镜质体反射率为1.00%~1.29%，生烃潜力大，实测含油气性好；优质页岩具有明显的高GR、高声波、低密度特征，结合地震波形分类和波阻抗反演技术，明确平面上丁山—东溪—关圣场地区最厚；发育宽缓稳定向斜，钻井普遍见良好油气显示，保存条件整体较好，主体埋深1 000~3 500 m，构造应力单一，可压性好。综合分析认为，綦江地区凉高山组陆相页岩具备良好的物质基础，保存条件好，页岩油总资源量超5亿吨，勘探潜力大。评价过程为持续扩大四川盆地陆相页岩油气勘探场面提供了研究思路。
- 页岩油气 /
- 潜力分析 /
- 勘探方向 /
- 凉高山组 /
- 綦江地区 /
- 四川盆地
Abstract: Advancements in evaluation and development technologies have established continental shale oil and gas as vital future alternative energy sources for China. Recently, exploratory wells drilled in the Lianggaoshan Formation shale segment of the Middle Jurassic in the Qijiang area, southeastern Sichuan, have shown promising oil and gas indications. To clarify the basic geological characteristics of shale oil and gas in this area, the organic-rich shale of the Lianggaoshan Formation in the southeastern Qijiang area was chosen as the subject of study. Based on core observations and laboratory analyses, an evaluation of the basic geological conditions for shale oil and gas in the second section of the Lianggaoshan Formation in the Qijiang area was conducted. This was combined with high-quality shale seismic prediction and structural preservation condition assessments to identify exploration potential and direct future exploration efforts. Using typical wells in the Qijiang area as case studies, resource potential analysis was performed by integrating organic geochemical characteristics, thermal maturity, reservoir physical properties, and oil and gas bearing characteristics. Results indicate that the high-quality shale in the lower subsection of the second member of the Lianggaoshan Formation spans an extensive area of 4 569 km², with thickness ranging from 20 to 39 m. Controlled by semi-deep lacustrine facies, this shale exhibits an average organic carbon content of 1.3% to 1.6%, with organic matter types predominantly Ⅱ₁ to Ⅱ₂, and vitrinite reflectance values between 1.00% and 1.29%. These characteristics suggest significant hydrocarbon generation potential and promising measured oil and gas content. The high-quality shale is characterized by high gamma-ray (GR) readings, high acoustic time difference, and low density. Seismic waveform classification and acoustic impedance inversion techniques identified the Dingshan, Dongxi, and Guanshengchang areas as regions of concentrated shale thickness. These areas feature large, broad, and gentle synclines with favorable drilling results, indicating good overall preservation conditions. The main burial depths ranges from 1 000 to 3 500 m, with uniform structural stress and good compressibility. In summary, the analysis indicates that the continental shale in the Lianggaoshan Formation of the Qijiang area possesses favorable preservation conditions and substantial shale oil resources exceeding 500×10⁶ t, offering significant exploration potential. This evaluation provides a strategic framework for expanding exploration efforts in continental shale oil and gas within the Sichuan Basin.
- shale oil and gas /
- potential analysis /
- exploration direction /
- Lianggaoshan Formation /
- Qijiang area /
- Sichuan Basin
注释:

利益冲突声明/Conflict of Interests

所有作者声明不存在利益冲突。

All authors disclose no relevant conflict of interests.

作者贡献/Authors’Contributions

陈超、刘晓晶参与论文的构思；陈超、刘苗苗、陈会霞、谢佳彤完成论文写作和修改；陈超、刘晓晶参与文章审查。所有作者均阅读并同意最终稿件的提交。

The study was designed by CHEN Chao and LIU Xiaojing. The manuscript was drafted and revised by CHEN Chao, LIU Miaomiao, CHEN Huixia, and XIE Jiatong. The manuscript was supervised by CHEN Chao and LIU Xiaojing. All authors have read the last version of the paper and consented to its submission.

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图 1 川东南綦江地区构造单元划分、采样井位置及地层柱状图

Figure 1. Division of tectonic units, location of sampling wells, and stratigraphic histogram in Qijiang area of southeastern Sichuan

下载: 全尺寸图片幻灯片

图 2 川东南綦江地区中侏罗统凉高山组二段沉积相连井剖面

Figure 2. Cross-well profile showing sedimentary facies in the second member of Lianggaoshan Formation of Middle Jurassic in Qijiang area of southeastern Sichuan

下载: 全尺寸图片幻灯片

图 3 川东南綦江地区DY8井凉高山组二段下亚段岩心及岩石薄片照片

Figure 3. Photos of cores and rock slices from the lower subsection of the second member of Lianggaoshan Formation of Middle Jurassic, taken from well DY8 in Qijiang area of southeastern Sichuan

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图 4 川东南綦江地区DY8井中侏罗统凉高山组二段下亚段全岩矿物分布

Figure 4. Distribution of whole-rock minerals in the lower subsection of the second member of Lianggaoshan Formation of Middle Jurassic, observed in well DY8 in Qijiang area of southeastern Sichuan

下载: 全尺寸图片幻灯片

图 5 川东南綦江地区中侏罗统凉高山组二段下亚段有机碳含量和干酪根类型

Figure 5. Distribution of organic carbon content and kerogen types in the lower subsection of the second member of Lianggaoshan Formation of Middle Jurassic in Qijiang area of southeastern Sichuan

下载: 全尺寸图片幻灯片

图 6 川东南綦江地区中侏罗统凉高山组二段下亚段页岩储集空间类型

Figure 6. Shale reservoir space types in the lower subsection of the second member of Lianggaoshan Formation of Middle Jurassic in Qijiang area of southeastern Sichuan

下载: 全尺寸图片幻灯片

图 7 川东南綦江地区中侏罗统凉高山组二段页岩孔径分布

Figure 7. Pore size distribution of shale in the second member of Lianggaoshan Formation of Middle Jurassic in Qijiang area of southeastern Sichuan

下载: 全尺寸图片幻灯片

图 8 川东南綦江地区中侏罗统凉高山组二段连井剖面

Figure 8. Cross-well profile of the second member of Lianggaoshan Formation of Middle Jurassic in Qijiang area of southeastern Sichuan

下载: 全尺寸图片幻灯片

图 9 川东南綦江地区QYS1井和复兴地区TY1井含油性对比综合剖面

Figure 9. Comprehensive profile of oil content comparison between well QYS1 in Qijiang area and well TY1 in Fuxing area of southeastern Sichuan

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图 10 川东南綦江地区中侏罗统凉高山组二段地震相分析

Figure 10. Seismic facies analysis of the second member of Lianggaoshan Formation of Middle Jurassic in Qijiang area of southeastern Sichuan

下载: 全尺寸图片幻灯片

图 11 川东南綦江地区中侏罗统凉高山组二下亚段地震相及波阻抗

Figure 11. Seismic facies and impedance map of the lower subsection of the second member of Lianggaoshan Formation of Middle Jurassic in Qijiang area of southeastern Sichuan

下载: 全尺寸图片幻灯片

图 12 川东南綦江地区中侏罗统凉高山组二段下亚段优质页岩厚度预测平面

Figure 12. Predicted fine shale thickness of the lower subsection of the second member of Lianggaoshan Formation of Middle Jurassic in Qijiang area of southeastern Sichuan

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图 13 四川盆地綦江地区(a)、复兴地区(b)区域地震剖面

Figure 13. Regional seismic profile of Qijiang(a) and Fuxing(b) area in Sichuan Basin

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图 14 川东南綦江地区中侏罗统凉高山组二段有利区评价

Figure 14. Favorable area evaluation of the second member of Lianggaoshan Formation of Middle Jurassic in Qijiang area of southeastern Sichuan

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图 15 川东南綦江地区页岩油气成藏模式

剖面位置见图 14。

Figure 15. Shale oil and gas reservoir model of Qijiang area of southeastern Sichuan

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表 1 四川盆地綦江地区、复兴地区典型钻井含油气性统计

Table 1. Statistics of oil and gas contents of typical wells in Qijiang and Fuxing area in Sichuan Basin

井名	优质页岩厚度/m	ω(TOC)/%	孔隙度/%	解析气量/(m³/t)	总含气量/(m³/t)	热解S₁/(mg/g)
DYS1井	29.6	1.47	3.13	0.51	1.32	0.71
TY1井	38.8	1.41	3.20	0.44	1.82	0.43

下载: 导出CSV

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