| 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 | |
| 发表期刊 | JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
 |
| ISSN | 0920-4105 |
| 卷号 | 186页码:19 |
| 通讯作者 | Guo, Xingwei(xwguo_qd@126.com) ; Zeng, Zhigang(zgzeng@qdio.ac.cn) |
| 摘要 | With 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. |
| 关键词 | Pore-throat structure Reservoir quality Formation mechanism Tight sandstone Longtan formation Borehole CSDP-2 South Yellow Sea Basin |
| DOI | 10.1016/j.petrol.2019.106733 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 资助项目 | National 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研究方向 | Energy & Fuels ; Engineering |
| WOS类目 | Energy & Fuels ; Engineering, Petroleum |
| WOS记录号 | WOS:000510467700060 |
| 出版者 | ELSEVIER |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/165308 |
| 专题 | 海洋地质与环境重点实验室 |
| 通讯作者 | Guo, Xingwei; Zeng, Zhigang |
| 作者单位 | 1.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 |
| 第一作者单位 | 中国科学院海洋研究所 |
| 通讯作者单位 | 中国科学院海洋研究所 |
| 推荐引用方式 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. |
| 条目包含的文件 | ||||||
| 文件名称/大小 | 文献类型 | 版本类型 | 开放类型 | 使用许可 | ||
| 1-s2.0-S092041051931（6908KB） | 期刊论文 | 出版稿 | 限制开放 | CC BY-NC-SA | 浏览 | |
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。
修改评论