气候变化领域集成服务门户(CCPortal): Insight into pore-throat size distribution and the controls on oil saturation of tight sandstone reservoirs using nuclear magnetic resonance parameters: A case study of the Lower Cretaceous Quantou Formation in the southern Songliao Basin; China

CCPortal

DOI	10.1306/04082018141
	Insight into pore-throat size distribution and the controls on oil saturation of tight sandstone reservoirs using nuclear magnetic resonance parameters: A case study of the Lower Cretaceous Quantou Formation in the southern Songliao Basin; China
	Xi K.; Cao Y.; Li K.; Liu K.; Zhu R.; Haile B.G.
发表日期	2020
ISSN	0149-1423
起始页码	2351
结束页码	2377
卷号	104 期号:11
英文摘要	Pore-throat structure characterization is crucial in tight-oil sandstone reservoir studies. To better understand pore-throat size distribution and the effects on reservoir oil saturation, petrographic, scanning electron microscopy, quantitative grain fluorescence (QGF), nuclear magnetic resonance (NMR), and pressure-controlled mercury injection investigations were performed on a suite of tight sandstones from the fourth member of the Lower Cretaceous Quantou Formation (K1q4) in the southern Songliao Basin, China. The tight sandstone samples showed similar compositional and textural maturity but different reservoir qualities at different depth intervals. Two oily indicators, QGF index and QGF on extract spectra intensity, varied significantly with respect to burial depth, suggesting the existence of strong oil heterogeneities in the K1q4 tight sandstones. Oil emplacement occurred mainly in the primary pores associated with the absence of pore-filling authigenic minerals. Pore-throat size distributions had wider ranges in the oil-rich layers than in the samples lacking oil emplacement. The NMR pore-throat radii ranged from 0.01 to 10 mm in oil lacking samples but ranged from 0.01 to 100 mm in oil-rich layers. Oil signals were mainly detected in the pore throats with radii ranging from approximately 0.1 to 1.0 mm in oil-rich layers. The NMR porosity can be divided into three parts based on transverse relaxation time (T2) spectrum: (1) immovable fluid, (2) porosity of effective movable fluid (PEMF), and (3) porosity of bound fluid. Bivariate plots of the ratios of various porosity types have significant effects in deciphering the oil saturation of tight sandstone reservoirs. The PEMF reflected well the reservoir QGF index, among others. Therefore, it can be considered as an effective NMR parameter to characterize pore size distribution and helpful in oil reservoir prediction. A good relationship exists between PEMF and geometric mean of the T2 distribution (T2gm), indicating that T2gm could also reflect reservoir oil saturation. The PEMF is mainly contributed by large pore throats, and the poorly sorted pore-throat distribution is better for effective movable fluids occurrence in tight sandstones. The approach employed in this study provides a more comprehensive and accurate pore-throat structure characterization in tight sandstone oil reservoirs, generating effective parameters and convenient ways to evaluate reservoir oil saturation. Importantly, it could be applicable for improving tight sandstone oil exploration and development efficiencies. Copyright © 2020. The American Association of Petroleum Geologists. All rights reserved.
英文关键词	Nuclear magnetic resonance; Parameter estimation; Petroleum prospecting; Petroleum reservoirs; Pore size; Sandstone; Scanning electron microscopy; Size distribution; Tight gas; Authigenic minerals; Effective parameters; Nuclear magnetic resonance(NMR); Pore throat structures; Reservoir quality; Sandstone reservoirs; Tight sandstone reservoirs; Transverse relaxation time; Petroleum reservoir engineering; Cretaceous; emplacement; hydrocarbon exploration; hydrocarbon reservoir; hydrothermal fluid; nuclear magnetic resonance; parameter estimation; pore space; porosity; sandstone; saturation; size distribution; China; Songliao Basin
语种	英语
来源期刊	AAPG Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/168677
作者单位	Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao, China; Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; Research Institute of Petroleum Exploration and Development, Beijing, China; Department of Geosciences, University of Oslo, Blindern, Oslo, Norway
推荐引用方式 GB/T 7714	Xi K.,Cao Y.,Li K.,et al. Insight into pore-throat size distribution and the controls on oil saturation of tight sandstone reservoirs using nuclear magnetic resonance parameters: A case study of the Lower Cretaceous Quantou Formation in the southern Songliao Basin; China[J],2020,104(11).
APA	Xi K.,Cao Y.,Li K.,Liu K.,Zhu R.,&Haile B.G..(2020).Insight into pore-throat size distribution and the controls on oil saturation of tight sandstone reservoirs using nuclear magnetic resonance parameters: A case study of the Lower Cretaceous Quantou Formation in the southern Songliao Basin; China.AAPG Bulletin,104(11).
MLA	Xi K.,et al."Insight into pore-throat size distribution and the controls on oil saturation of tight sandstone reservoirs using nuclear magnetic resonance parameters: A case study of the Lower Cretaceous Quantou Formation in the southern Songliao Basin; China".AAPG Bulletin 104.11(2020).