气候变化领域集成服务门户(CCPortal): Wettability and connectivity of overmature shales in the Fuling gas field, Sichuan Basin (China)

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DOI	10.1306/09051817138
	Wettability and connectivity of overmature shales in the Fuling gas field, Sichuan Basin (China)
	Yang R.; Hu Q.; He S.; Hao F.; Guo X.; Yi J.; Sun M.
发表日期	2019
ISSN	0149-1423
卷号	103 期号:3
英文摘要	The Fuling gas field in Sichuan Basin, China, has produced greater than 1.5 · 10 10 m 3 (0.53 tcf) of natural gas from overmature Upper Ordovician Wufeng and lower Silurian Longmaxi shales. To systemically investigate the characteristics of wettability and connectivity and to understand the underlying causes of production behavior, we study five samples of Wufeng and Longmaxi shales with different total organic carbon contents and mineral compositions. Complementary approaches include mercury intrusion capillary pressure (MICP), contact angle measurement, spontaneous imbibition and saturated diffusion, and tracer (both nonsorbing and sorbing) migration mapped via laser ablation inductively coupled plasma mass spectrometry. According to measured contact angles and imbibition tests conducted on aqueous (deionized water and brine) and oleic (n-decane) phases, Wufeng and Longmaxi shales are strongly oil wet and moderately strong water wet. The lower boundary of estimated permeability obtained from n-decane imbibition can reach 137 nd, which is higher than the geometric mean permeability derived from the MICP method (5.5–68.8 nd). Effective diffusion coefficients of the Wufeng and Longmaxi shales are in the range of 10 -13 m 2 /s (1.1 · 10 -12 ft 2 /s). Tests of imbibition and saturated diffusion using tracer-containing brine show that concentrations of nanometer-sized tracers decrease rapidly (a factor of >10) over a migration distance of a few millimeters from the sample edge, suggesting the presence of poorly edge-connected water-wet pores. Sparsely connected hydrophilic pores, mixed wettability, and highly restricted pathways collectively contribute to the limited migration of nano-sized tracers, which probably results in the production behavior of initial steep decline and low overall recovery in the Fuling gas field. Copyright © 2019. The American Association of Petroleum Geologists. All rights reserved.
语种	英语
scopus关键词	Contact angle; Deionized water; Diffusion; Gas industry; Laser ablation; Mass spectrometry; Organic carbon; Paraffins; Wetting; Effective diffusion coefficients; Hydrophilic pores; Laser ablation inductively-coupled plasma mass spectrometries; Migration distance; Mineral composition; Production behaviors; Spontaneous imbibition; Total organic carbon content; Natural gas fields; ablation; capillary pressure; chemical composition; connectivity; gas field; imbibition; natural gas; Ordovician; Ordovician-Silurian boundary; permeability; shale; Silurian; wettability; China; Chongqing; Fuling Gas Field; Sichuan Basin; Taiwan; Wufeng
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/125073
作者单位	Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan, China; School of Geosciences, China University of Petroleum (East China), Qingdao, Shandong, China; Department of Earth and Environmental Sciences, University of Texas at Arlington, Arlington, TX, United States; School of Geosciences, China University of Petroleum (East China), Qingdao, Shandong, China; Exploration Company,, Sinopec, Chengdu, China; Jianghan Oilfield Branch Company, Sinopec, Wuhan, China
推荐引用方式 GB/T 7714	Yang R.,Hu Q.,He S.,et al. Wettability and connectivity of overmature shales in the Fuling gas field, Sichuan Basin (China)[J],2019,103(3).
APA	Yang R..,Hu Q..,He S..,Hao F..,Guo X..,...&Sun M..(2019).Wettability and connectivity of overmature shales in the Fuling gas field, Sichuan Basin (China).AAPG Bulletin,103(3).
MLA	Yang R.,et al."Wettability and connectivity of overmature shales in the Fuling gas field, Sichuan Basin (China)".AAPG Bulletin 103.3(2019).