Quantitative characterization of reservoir space in the first member of Maokou Formation,Southern Sichuan Basin

doi:10.7605/gdlxb.2025.059

Journal of Palaeogeography（Chinese Edition） ›› 2025, Vol. 27 ›› Issue (5): 1104-1118. doi: 10.7605/gdlxb.2025.059

• PALAEOGEOGRAPHY AND MINERAL RESOURCES • Previous Articles Next Articles

Quantitative characterization of reservoir space in the first member of Maokou Formation,Southern Sichuan Basin

YOU Donghua¹(), ZHANG Liyu¹, LI Rong², SONG Xiaobo², YU Lingjie¹, ZHOU Lingfang¹, JIANG Xiaoqiong¹

1 Wuxi Research Institute of Petroleum Geology, Research Institute of Petroleum Exploration and Production, SINOPEC, Jiangsu Wuxi 214126, China
2 Research Institute of Exploration and Development, Southwest Oil and Gas Company,SINOPEC, Chengdu 610041, China

Received:2024-10-07 Revised:2025-02-09 Online:2025-10-01 Published:2025-09-30
About author:
YOU Donghua,born in 1980,an associate researcher,is engaged in research on carbonate reservoir. E-mail: youdh.syky@sinopec.com.
Supported by:
Enterprise Innovation and Development Joint Fund of National Natural Science Foundation of China(U24B6001); Enterprise Innovation and Development Joint Fund of National Natural Science Foundation of China(U19B6003); Scientific and Technological Project of Sinopec(P22214-3); Scientific and Technological Project of Sinopec(P22073)

川南地区茅口组一段储集空间定量表征^*

尤东华¹(), 张力钰¹, 李蓉², 宋晓波², 俞凌杰¹, 周凌方¹, 蒋小琼¹

1 中国石化石油勘探开发研究院无锡石油地质研究所, 江苏无锡 214126
2 中国石化西南油气分公司勘探开发研究院, 四川成都 610041

作者简介:
尤东华,男,1980年生,博士,副研究员,主要从事碳酸盐岩储层地质学研究。E-mail: youdh.syky@sinopec.com。
基金资助:
*国家自然科学基金企业创新发展联合基金(U24B6001); 国家自然科学基金企业创新发展联合基金(U19B6003); 中国石油化工股份有限公司科技项目(P22214-3); 中国石油化工股份有限公司科技项目(P22073)

Abstract

Abstract:

The first member of the Permian Maokou Formation in the Sichuan Basin,characterized by argillaceous carbonate rocks that exhibit both source and reservoir properties,making it a significant area for exploration. This study focuses on the development and characteristics of various pore types within these rocks. In this study,the qualitative and quantitative characterizations of pore types and their correlations and controlling factors were studied in detail. This was achieved through the measurement of porosity,X-ray diffraction analysis of whole-rock minerals,and total organic carbon(TOC)content analysis of 60 core samples from three wells in the southern Sichuan Basin. Additionally,qualitative observations were performed using argon ion polishing scanning electron microscopy on selected samples. Quantitative results indicate that samples from wells GS1 and JH1 are predominantly composed of organic-related pores,whereas samples from well TY1 exhibit substantial contributions from both clay mineral-related and organic-related pores. Statistical analysis reveals that when clay mineral content ranges between 15% and 50%,and TOC content exceeds 1%,the highest number of samples with porosity greater than 2% is observed. For marlstone with low clay mineral content(<10%),pore development is primarily controlled by TOC content and the degree of organic pore development. A clear positive correlation exists between porosity and TOC content,with a correlation coefficient as high as 0.87. As clay mineral content increases,the contribution of clay mineral-related pores to total porosity becomes more significant. Overall,the development of argillaceous carbonate reservoir space in the first member of the Maokou Formation is primarily influenced by clay mineral and TOC content. These findings have important implications for evaluating regional differences in reservoir development.

Key words: argillaceous limestone, carbonate, quantitative characterization, Maokou Formation, Sichuan Basin

摘要：

二叠系茅口组一段是四川盆地重要的勘探领域之一,其以源储一体的泥质碳酸盐岩为典型特征,相关不同类型孔隙的发育程度是当前普遍关注的问题之一。通过对川南地区3口钻井取心段60件样品的孔隙度测定、全岩矿物X衍射分析、总有机碳含量分析与部分样品的氩离子抛光扫描电镜观察,开展不同类型孔隙相对贡献的定性与定量储层表征,并分析其之间的相关关系及控制因素对孔隙发育的影响。定量研究结果显示,GS1、JH1井样本以有机质相关孔隙为主,而TY1井样本黏土矿物相关孔隙与有机质相关孔隙均具有重要贡献。统计分析表明,黏土矿物含量介于15%~50%之间、TOC含量大于1%时,孔隙度超过2%的样本数最多; 对于低黏土矿物含量(<10%)的泥灰岩而言,其孔隙发育程度主要受总有机碳含量与有机孔发育程度的控制; 孔隙度与总有机碳含量之间呈正相关,相关系数高达0.87; 随着黏土矿物含量的增加,黏土矿物相关孔隙对总孔隙度的贡献明显提高。四川盆地川南地区茅口组一段泥质碳酸盐岩储集空间的发育主要受黏土矿物与总有机碳含量的控制,这一认识对进一步评价不同地区储集层发育的差异性具有重要意义。

关键词: 泥质灰岩, 碳酸盐岩, 定量表征, 茅口组, 四川盆地

CLC Number:

P588.24+5

YOU Donghua, ZHANG Liyu, LI Rong, SONG Xiaobo, YU Lingjie, ZHOU Lingfang, JIANG Xiaoqiong. Quantitative characterization of reservoir space in the first member of Maokou Formation,Southern Sichuan Basin[J]. Journal of Palaeogeography（Chinese Edition）, 2025, 27(5): 1104-1118.

尤东华, 张力钰, 李蓉, 宋晓波, 俞凌杰, 周凌方, 蒋小琼. 川南地区茅口组一段储集空间定量表征^*[J]. 古地理学报, 2025, 27(5): 1104-1118.

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URL: http://www.gdlxb.cn/EN/10.7605/gdlxb.2025.059

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Figures/Tables 10

Fig.1 Sedimentary facies(a,modified from Li et al., 2024)and comprehensive column (b,modified from Meng et al., 2024) of the first member of Maokou Formation of Well TY1 in Sichuan Basin

Fig.2 Stratigraphic correlation of the first member of Maokou Formation among Wells JH1-TY1-GS1,Sichuan Basin

Fig.3 Relative contribution of different types of pores to the porosity in the first member of Maokou Formation,southern Sichuan Basin

Fig.4 Relationship chart among clay mineral content,total organic carbon content,and porosity,as well as relative percentage in the first member of Maokou Formation,southern Sichuan Basin

Fig.5 Correlation among porosity,total organic carbon content,and clay content in the first member of Maokou Formation,southern Sichuan Basin

Fig.6 Differences in pore development characteristics under argon ion electron microscopy of samples in the first member of Maokou Formation in Well GS1,southern Sichuan Basin

Fig.7 Differences in pore development characteristics under argon ion electron microscopy of samples in the first member of Maokou Formation in Well JH1,southern Sichuan Basin

Fig.8 Differences in pore development characteristics under argon ion electron microscopy of samples in the first member of Maokou Formation in Well TY1,southern Sichuan Basin

Fig.9 Relationship between content of talc and porosity of samples in the first member of Maokou Formation,southern Sichuan Basin

Fig.10 Micropore evolution model of the first member of Maokou Formation,southern Sichuan Basin

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