川东南五峰组—龙马溪组深层、超深层页岩储层特征及其页岩气勘探意义

魏富彬; 刘珠江; 陈斐然; 袁桃; 李飞

doi:10.11781/sysydz202304751

川东南五峰组—龙马溪组深层、超深层页岩储层特征及其页岩气勘探意义

doi: 10.11781/sysydz202304751

中国石化勘探分公司, 成都 610041

基金项目:

国家自然科学基金企业创新发展联合基金“海相深层页岩源—储动态演化与页岩气富集机理” U19B6003-03-03

详细信息

作者简介:
魏富彬(1989—)，男，工程师，从事非常规油气评价研究。E-mail: weifb.ktnf@sinopec.com

中图分类号: TE122.23
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出版历程
- 收稿日期: 2023-03-26
- 修回日期: 2023-06-03
- 刊出日期: 2023-07-28

Characteristics of the deep and ultra-deep shale reservoirs of the Wufeng-Longmaxi formations in the southeastern Sichuan Basin and the significance of shale gas exploration

SINOPEC Exploration Company, Chengdu, Sichuan 610041, China

摘要

摘要: 四川盆地东南地区上奥陶统五峰组—下志留统龙马溪组中深层领域页岩气勘探及页岩储层特征与主控因素的研究已经取得了丰硕成果，而作为当前页岩气勘探重点的深层、超深层领域，由于受钻井等因素的制约，对于其储层发育特征及与中深层页岩储层的差异等研究还不够深入。为了明确五峰组—龙马溪组深层、超深层页岩储层特征，为勘探部署提供依据，选取川东南地区4口埋深在2 000~6 000 m的典型页岩气钻井，系统开展了深层、超深层页岩储层发育特征及差异对比研究，探讨了储层孔隙发育的成因。研究表明：(1)埋深在6 000 m以内，五峰组—龙马溪组页岩储层依然能够发育高孔有效储层，且随埋深的增大孔隙度无明显变化，但是有机质孔的形态、孔隙结构及连通性存在一定差异，即随着埋深的增大，有机质孔孔径相对变小，孔隙连通性变差；(2)明确了生物成因的硅质是孔隙发育的基础，流体超压是储层孔隙保持的关键，在两者联合作用下，深层、超深层页岩高孔隙优质储层得以发育和保持；(3)基于储层发育的研究，将页岩气勘探拓深至6 000 m，明确了下一步页岩气勘探方向。初步评价四川盆地及周缘五峰组—龙马溪组深层、超深层页岩气(埋深为4 000~5 000 m)资源量超2×10¹² m³。
- 页岩储层 /
- 深层超深层页岩气 /
- 五峰组—龙马溪组 /
- 上奥陶统 /
- 下志留统 /
- 川东南地区
Abstract: Fruitful achievements have been made in shale gas exploration in the middle and deep areas from the Upper Ordovician Wufeng Formation to the Lower Silurian Longmaxi Formation in the southeastern Sichuan Basin, and in the research on shale reservoir characteristics and main controlling factors. As the key direction of current shale exploration, the deep and ultra-deep areas are limited by drilling and other factors, and the research on reservoir development characteristics and differences with the middle and deep shale reservoirs is insufficient. In order to clarify the characteristics of the deep and ultra-deep shale reservoirs of the Wufeng-Longmaxi formatiosns, four typical shale gas wells at the depth of 2 000-6 000 m in the southeastern Sichuan exploration area were selected to systematically carry out a comparative study of deep and ultra-deep shale reservoir development characteristics and differences, and the causes of pore development were discussed. The results show that: (1) With a burial depth of less than 6 000 m, the shale reservoirs of the Wufeng-Longmaxi formations are effective reservoirs with high porosity, and the porosity has no obvious change with the change of burial depth. However, there are certain differences in the morphology, structure and connectivity of organic matter pores, that is, with the increase of burial depth, the size of organic matter pores relatively decreases, and the pore connectivity deteriorates; (2) It has been clarified that biogenic silica is the foundation of pore development, and fluid overpressure is the key to maintaining reservoir pores. Under the combined action of biogenic silica and biogenic silica, the deep and ultra-deep shale reservoirs with high porosity and high quality can be developed and maintained; (3) Based on the research of reservoir development, shale gas exploration will be extended to 6 000 m, which provides a clear direction for shale gas exploration in the next step. It is preliminarily assessed that the deep and ultra-deep shale gas (buried depth of 4 000-5 000 m) resources in the Wufeng-Longmaxi formations in the Sichuan Basin and its surrounding areas exceed 2×10¹² m³.
- shale reservoir /
- deep and ultra-deep shale gas /
- Wufeng-Longmaxi formations /
- Upper Ordovician /
- Lower Silurian /
- southeastern 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

李飞参与实验设计；陈斐然完成实验操作；魏富彬、刘珠江、袁桃参与论文写作和修改。所有作者均阅读并同意最终稿件的提交。

The study was designed by LI Fei. The experimental operation was completed by CHEN Feiran. The manuscript was drafted and revised by WEI Fubin, LIU Zhujiang and YUAN Tao. All the authors have read the last version of paper and consented for submission.

HTML全文

图 1 四川盆地及周缘上奥陶统五峰组底界埋深及重点气田、取样井位置

Figure 1. Burial depth of the bottom boundary of the Upper Ordovician Wufeng Formation and locations of the key gas fields and sampling wells in the Sichuan Basin and its periphery

下载: 全尺寸图片幻灯片

图 2 四川盆地及周缘下志留统龙马溪组沉积早期沉积相平面分布

Figure 2. Plane distribution of sedimentary facies during the early deposition of the Lower Silurian Longmaxi Formation in the Sichuan Basin and its periphery

下载: 全尺寸图片幻灯片

图 3 川东南地区上奥陶统五峰组—下志留统龙马溪组优质页岩段厚度、TOC、热演化程度、矿物含量综合对比

Figure 3. Comparison of thickness, TOC content, thermal evolution degree and mineral content in the high-quality shale section of the Upper Ordovician Wufeng Formation to Lower Silurian Longmaxi Formation in the southeastern Sichuan Basin

下载: 全尺寸图片幻灯片

图 4 四川盆地上奥陶统五峰组—下志留统龙马溪组优质页岩差异抬升演化示意

Figure 4. Differential uplift evolution of the high-quality shale section of the Upper Ordovician Wufeng Formation to Lower Silurian Longmaxi Formation in the Sichuan Basin

下载: 全尺寸图片幻灯片

图 5 四川盆地上奥陶统五峰组—下志留统龙马溪组优质页岩段孔隙度与TOC、含气量相关性

Figure 5. Correlation between porosity and TOC and gas contents in the high-quality shale section of the Upper Ordovician Wufeng Formation to Lower Silurian Longmaxi Formation in the Sichuan Basin

下载: 全尺寸图片幻灯片

图 6 四川盆地上奥陶统五峰组—下志留统龙马溪组优质页岩段孔隙度与含气量平均值

Figure 6. Average values of porosity and gas content in the high-quality shale section of the Upper Ordovician Wufeng Formation to Lower Silurian Longmaxi Formation in the Sichuan Basin

下载: 全尺寸图片幻灯片

图 7 四川盆地上奥陶统五峰组—下志留统龙马溪组海相优质页岩孔隙度随埋深的变化规律

Figure 7. Variation pattern of porosity with buried depth in the high-quality shale section of the Upper Ordovician Wufeng Formation to Lower Silurian Longmaxi Formation in the Sichuan Basin

下载: 全尺寸图片幻灯片

图 8 四川盆地不同埋深条件下上奥陶统五峰组—下志留统龙马溪组优质页岩储层有机质孔隙发育形态对比

Figure 8. Comparison of the development morphology of organic matter pores in the high-quality shale section of the Upper Ordovician Wufeng Formation to Lower Silurian Longmaxi Formation in the Sichuan Basin

下载: 全尺寸图片幻灯片

图 9 四川盆地上奥陶统五峰组—下志留统龙马溪组优质页岩段储层孔径分布

Figure 9. Reservoir pore size distribution in the high-quality shale section of the Upper Ordovician Wufeng Formation to Lower Silurian Longmaxi Formation in the Sichuan Basin

下载: 全尺寸图片幻灯片

图 10 四川盆地下志留统龙马溪组页岩硅质演化及孔隙发育模式

Figure 10. Siliceous evolution and pore development models of shale in the Lower Silurian Longmaxi Formation in the Sichuan Basin

下载: 全尺寸图片幻灯片

图 11 川东南不同地层压力条件下上奥陶统五峰组—下志留统龙马溪组优质页岩段孔隙度变化

Figure 11. Changes in porosity of the high-quality shale section of the Upper Ordovician Wufeng Formation to Lower Silurian Longmaxi Formation under different formation pressure conditions in the southeastern Sichuan Basin

下载: 全尺寸图片幻灯片

表 1 川东南上奥陶统五峰组—下志留统龙马溪组优质页岩段储层孔隙度、含气量及压力系数

Table 1. Reservoir porosity, gas content and pressure coefficient of the high-quality shale section of the Upper Ordovician Wufeng Formation to Lower Silurian Longmaxi Formation in the southeastern Sichuan Basin

钻井名称	页岩埋深/m	孔隙度/%	含气量/(m³/t)	压力系数
JY2井	2 575	6.20	6.46	1.55
XY1井	3 650	6.05	5.95	1.90
DYS2井	4 278	7.40	6.69	2.06
PS1井	5 969	5.22	7.44	1.95

下载: 导出CSV

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