IOCAS-IR  > 海洋地质与环境重点实验室
Pore-throat structures of the Permian Longtan Formation tight sandstones in the South Yellow Sea Basin, China: A case study from borehole CSDP-2
Cai, Laixing1,2,3; Guo, Xingwei2,3; Zhang, Xunhua2,3; Zeng, Zhigang1,3; Xiao, Guolin2,3; Pang, Yumao3; Wang, Shuping4
2020-03-01
Source PublicationJOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
ISSN0920-4105
Volume186Pages:19
Corresponding AuthorGuo, Xingwei(xwguo_qd@126.com) ; Zeng, Zhigang(zgzeng@qdio.ac.cn)
AbstractWith good exploration prospects and proven source rocks in Permian, reservoir evaluation has become the main bottleneck hindering petroleum exploration in the South Yellow Sea Basin, China, where the pore-throat structures, which are particularly important for the reservoir quality of tight sandstones, have never been characterized. To solve this, tight sandstones taken from borehole CSDP-2 of the Permian Longtan (P(2)l) Formation were systemically investigated with high-precision pore-throat characterization methods. The results show that pore-throat structures of tight sandstones in the Longtan Formation can be classified into three categories with synthesis considerations of pore-throat type, size, and connectivity; these pore-throats are denoted lattice-like, tubular, and isolated, respectively. The lattice-like pore throats with relatively larger radii (>0.1 mu m) and higher connectivity exhibit the best performance for reservoir quality, followed by tubular pore-throat structures, while isolated pore throats have almost no capacity to migrate or store fluids. In the formation mechanism of various pore-throat structures, both the plastic component content and complex diagenesis play a significant role. Strong compaction results in a loss of nearly half of the initial porosity (av. 49.81%) during the initial diagenetic stage. Then, clay mineral cements partially occlude pores and throats, which are the dominant factors in the transition of pore-throat structures from lattice-like to tubular. Silica and carbonate cementation are the key processes that fill the primary pore throats, secondary dissolution pores, and microfractures, leading to the formation of isolated pore-throat structures and low-porosity, ultra-low-permeability reservoirs. Feldspar dissolution cannot take place on a large scale due to the early densification of the sandstone, and it does not significantly improve the reservoir quality; it increases the porosity by less than 4.0%. This research provides constructive insights into the coupled evolution of pore-throat structures and diagenetic processes, which can aid in further understanding the formation mechanism of tight sandstones. In practice, this work also provides a scientific basis for identifying effective reservoirs, and promotes petroleum exploration in the South Yellow Sea Basin, China.
KeywordPore-throat structure Reservoir quality Formation mechanism Tight sandstone Longtan formation Borehole CSDP-2 South Yellow Sea Basin
DOI10.1016/j.petrol.2019.106733
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[41906188] ; National Natural Science Foundation of China[41776081] ; National Natural Science Foundation of China[41806057] ; National Marine Geology Project of China[DD20160147] ; National Marine Geology Project of China[DD20190365] ; Special Fund for the Taishan Scholar Program of Shandong Province[TS201511061]
WOS Research AreaEnergy & Fuels ; Engineering
WOS SubjectEnergy & Fuels ; Engineering, Petroleum
WOS IDWOS:000510467700060
PublisherELSEVIER
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/165308
Collection海洋地质与环境重点实验室
Corresponding AuthorGuo, Xingwei; Zeng, Zhigang
Affiliation1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China
2.China Geol Survey, Qingdao Inst Marine Geol, Qingdao 266071, Peoples R China
3.Pilot Natl Lab Marine Sci & Technol Qingdao, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China
4.China Univ Petr East China, Oil Ind Training Ctr, Qingdao 266580, Peoples R China
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Cai, Laixing,Guo, Xingwei,Zhang, Xunhua,et al. Pore-throat structures of the Permian Longtan Formation tight sandstones in the South Yellow Sea Basin, China: A case study from borehole CSDP-2[J]. JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING,2020,186:19.
APA Cai, Laixing.,Guo, Xingwei.,Zhang, Xunhua.,Zeng, Zhigang.,Xiao, Guolin.,...&Wang, Shuping.(2020).Pore-throat structures of the Permian Longtan Formation tight sandstones in the South Yellow Sea Basin, China: A case study from borehole CSDP-2.JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING,186,19.
MLA Cai, Laixing,et al."Pore-throat structures of the Permian Longtan Formation tight sandstones in the South Yellow Sea Basin, China: A case study from borehole CSDP-2".JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING 186(2020):19.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Cai, Laixing]'s Articles
[Guo, Xingwei]'s Articles
[Zhang, Xunhua]'s Articles
Baidu academic
Similar articles in Baidu academic
[Cai, Laixing]'s Articles
[Guo, Xingwei]'s Articles
[Zhang, Xunhua]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Cai, Laixing]'s Articles
[Guo, Xingwei]'s Articles
[Zhang, Xunhua]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.