国家冰川冻土沙漠科学数据中心

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名称	Reservoir petrofacies — A tool for characterization of reservoir quality and pore structures in a tight sandstone reservoir: A study from the sixth member of Upper Triassic Yanchang Formation,Ordos Basin,China
科技资源标识	CSTR:11738.14.NCDC.XDA14.PP5820.2024
DOI	10.1016/j.petrol.2020.108294
数据共享方式	开放下载
摘要	Reservoir petrofacies is an important tool for the better understanding of the key petrographic parameters (primary texture and detrital component, types and processes of diagenetic alteration) that control reservoir properties of tight sandstones. This study aims to investigate sandstone texture and composition, and diagenetic features of the sixth member of Upper Triassic Yanchang Formation (YC6 member), Ordos Basin, China, and to examine controls of diagenesis and petrofacies on reservoir quality and pore structures of tight sandstone reservoirs. This study has been carried out using petrography, XRD, SEM, routine core analysis and mercury intrusion capillary pressure (MICP) test. The YC6 member sandstones are moderately well sorted, very fine- to fine-grained arkoses. The reservoir quality and pore throat distributions are highly heterogeneous in the sandstones. Four reservoir petrofacies are defined based on the combination of sandstone detrital components, diagenetic processes, pore types and reservoir properties. Contrasting diagenetic characteristics between these petrofacies are mainly determined by detrital grain size through ductile grain compaction. Ductile grain compaction has a significant control on porosity and permeability of the sandstones. Especially, the poor quality has been encountered in the petrofacies where ductile grain content is >12%. Calcite cement has helped destroy quality of the petrofacies where the cement is present in amounts >15%. Reservoir quality is best for the petrofacies that is poor in both ductile grain and calcite cement and commensurately is rich in secondary dissolution. Four pore-facies types are defined based on the dominant pore throat dimension of the sandstones. The large pore-throat regime determines permeability and fluid flow of reservoir rocks. A good correlation between pore-facies and petrofacies indicates diagenetic effect on pore structures of the sandstones. The study provides insights into how reservoir quality and pore structures of tight sandstone reservoirs are correlated with reservoir petrofacies.
学科分类	170.50
关键词	Diagenesis Petrofacies Reservoir quality Pore structures Tight sandstones Yanchang Formation
作者	Cao Binfeng,Sun W,Li J
数据量	28.1 MiB
论文类型：	journal
论文网址：	https://doi.org/10.1016/j.petrol.2020.108294
期刊名称：	Journal of Petroleum Science and Engineering
出版时间：	2021-04-01

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数据引用

Cao Binfeng,Sun W,Li J. Reservoir petrofacies — A tool for characterization of reservoir quality and pore structures in a tight sandstone reservoir: A study from the sixth member of Upper Triassic Yanchang Formation,Ordos Basin,China. 国家冰川冻土沙漠科学数据中心(http://www.ncdc.ac.cn), 2024. https://cstr.cn/CSTR:11738.14.NCDC.XDA14.PP5820.2024.

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本作品采用知识共享署名 4.0 国际许可协议进行许可。

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项目信息详情

项目名称：深层油气形成与分布预测
项目编号：XDA14010000
项目类别：中国科学院战略性先导科技专项（A类）