川南地区二叠系龙潭组页岩储层特征及勘探潜力

doi:10.12108/yxyqc.20230101

岩性油气藏 ›› 2023, Vol. 35 ›› Issue (1): 1–11.doi: 10.12108/yxyqc.20230101

川南地区二叠系龙潭组页岩储层特征及勘探潜力

杨跃明¹, 张少敏^2,3, 金涛², 明盈², 郭蕊莹², 王兴志⁴, 韩璐媛²

1. 中国石油西南油气田分公司, 成都 610051;
2. 中国石油西南油气田分公司勘探开发研究院, 成都 610041;
3. 页岩气评价与开采四川省重点实验室, 成都 610213;
4. 西南石油大学地球科学与技术学院, 成都 610500

收稿日期:2022-04-17 修回日期:2022-05-13 出版日期:2023-01-01 发布日期:2023-01-06
第一作者:杨跃明(1963-),男,博士,教授级高级工程师,主要从事油气勘探开发研究及技术管理工作。地址:(610051)四川省成都市成华区府青路一段3号。Email:yangym@petrochina.com.cn
通信作者: 张少敏(1989-),女,博士,工程师,主要从事石油地质勘探方面的研究工作。Email:zhangsm19@petrochina.com.cn。
基金资助:
中国石油西南油气田分公司科技项目“川中地区侏罗系页岩油气地质特征及富集条件研究”(编号: 20200301-03)和中国石油科技项目“页岩油勘探开发技术研究”(编号: 2021DJ1801-08)联合资助

Characteristics and exploration potential of shale reservoirs of Permian Longtan Formation in southern Sichuan Basin

YANG Yueming¹, ZHANG Shaomin^2,3, JIN Tao², MING Ying², GUO Ruiying², WANG Xingzhi⁴, HAN Luyuan²

1. PetroChina Southwest Oil and Gas Field Company, Chengdu 610051, China;
2. Research Institute of Exploration and Development, PetroChina Southwest Oil and Gas Field Company, Chengdu 610041, China;
3. Sichuan Key Laboratory of Shale Gas Evaluation and Exploitation, Chengdu 610213, China;
4. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China

Received:2022-04-17 Revised:2022-05-13 Online:2023-01-01 Published:2023-01-06

摘要/Abstract

摘要： 二叠系龙潭组是目前四川盆地页岩气勘探开发的新热点层位。通过偏光显微镜鉴定、场发射扫描电镜分析、X射线衍射测试、有机碳含量测定及高压压汞分析、现场解析气实验等手段和方法，对川南地区二叠系龙潭组页岩储层进行了综合研究。研究结果表明: ①川南地区二叠系龙潭组为一套陆相曲流河沉积，河漫沉积的页岩发育，其矿物成分主要为石英和黏土矿物，含少量碳酸盐矿物。②研究区页岩储层主要发育粒间 (缘) 孔与微裂缝，局部发育粒内孔与溶蚀孔，偶见有机质孔隙，其中黏土矿物层间微裂缝最为发育。孔隙结构表现为以微孔为主，介孔 (孔径为2～50nm) 次之，孔径普遍较小，分选较差，孔隙和喉道半径差异较大，非均质性强。③研究区页岩储层中煤岩含气量最高，炭质泥岩与泥岩次之，泥质粉砂岩、粉砂岩与细砂岩含气量最低。与龙马溪组页岩储层相比，龙潭组泥岩孔隙度与总含气量更好，渗透率较差，其中炭质泥岩的孔隙度和总含气量最佳。④研究区二叠系龙潭组勘探潜力较大，烃源岩中有机质类型主要为Ⅲ型，其次为Ⅱ₂型；其R_o值平均约为2.8%，达到高熟阶段；TOC含量变化范围大，炭质泥岩中的TOC一般大于15%。⑤川南地区二叠系龙潭组发育河漫平原沉积，富有机质泥页岩分布稳定，具备良好的页岩气形成条件，估算其天然气资源量约为2.4×10¹²m³，有利勘探区主要位于川南古蔺-叙永地区。

关键词: 层间微裂缝, 高熟阶段, 页岩气, 河漫沉积, 龙潭组, 二叠系, 古蔺-叙永地区, 川南地区

Abstract: The Longtan Formation is a new important layer for shale gas exploration and development in Sichuan Basin. The shale reservoirs of Permian Longtan Formation in southern Sichuan Basin was comprehensively studied by means of polarizing microscope identification，field emission scanning electron microscope analysis，X-ray diffraction test，organic carbon content determination，high-pressure mercury injection analysis and on-site analytical gas experiment. The results show that: (1) The Permian Longtan Formation in southern Sichuan Basin is a set of continental meandering river deposits，and shale is developed in fluvial deposits. Its minerals are mainly quartz and clay minerals，with a small amount of carbonate minerals. (2) There are mainly intergranular (marginal) pores and microfractures developed in the shale reservoirs in the study area，intragranular pores and dissolved pores are locally developed，and organic pores are rarely developed，among which microfractures between clay minerals are the most developed. The pore structures are mainly microporous，followed by mesoporous (with pore size of 2-50 nm). The pore size is generally small，with poor sorting，the radius difference between pore and throat is large，and the heterogeneity is strong. (3) In the shale reservoirs in the study area，the gas content in coal rock is the highest，followed by carbonaceous mudstone and mudstone，and the gas content in argillaceous siltstone，siltstone and fine sandstone is the lowest. Compared with the shale reservoir of Longmaxi Formation，the mudstone of Longtan Formation has better porosity and total gas content and poor permeability，and the porosity and total gas content of carbonaceous mudstone are the best. (4) The Permian Longtan Formation in the study area has great exploration potential. The organic matter in the source rocks is mainly type Ⅲ，followed by typeⅡ₂. The average value of R_o is about 2.8%，reaching the stage of high maturity. TOC content varies widely， and TOC content in carbonaceous mudstone is generally greater than 15%. (5) Alluvial plain is developed in Permian Longtan Formation in southern Sichuan Basin，being rich in organic shale，with good shale gas formation conditions. The estimated natural gas resources are about 2.4×10¹² m³，and the favorable exploration area is mainly located in Gulin-Xuyong area in southern Sichuan Basin.

Key words: interlayer microfracture, high maturity stage, shale gas, fluvial deposit, Longtan Formation, Permian, Gulin-Xuyong area, Sichuan Basin

中图分类号:

TE122.2

杨跃明, 张少敏, 金涛, 明盈, 郭蕊莹, 王兴志, 韩璐媛. 川南地区二叠系龙潭组页岩储层特征及勘探潜力[J]. 岩性油气藏, 2023, 35(1): 1–11.

YANG Yueming, ZHANG Shaomin, JIN Tao, MING Ying, GUO Ruiying, WANG Xingzhi, HAN Luyuan. Characteristics and exploration potential of shale reservoirs of Permian Longtan Formation in southern Sichuan Basin[J]. Lithologic Reservoirs, 2023, 35(1): 1–11.

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川南地区二叠系龙潭组页岩储层特征及勘探潜力

Characteristics and exploration potential of shale reservoirs of Permian Longtan Formation in southern Sichuan Basin

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