Pore-throat structures of the Permian Longtan Formation tight sandstones in the South Yellow Sea Basin, China: A case study from borehole CSDP-2

doi:10.1016/j.petrol.2019.106733

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, Laixing 1,2,3; Guo, Xingwei 2,3; Zhang, Xunhua 2,3; Zeng, Zhigang1,3 ; Xiao, Guolin 2,3; Pang, Yumao3 ; Wang, Shuping 4
	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([email protected]) ; Zeng, Zhigang([email protected])
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	被引频次：19[WOS] [WOS记录] [WOS相关记录]
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.

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