气候变化领域集成服务门户(CCPortal): Depositional environments in an arid; closed basin and their implications for oil and gas exploration: The lower Permian Fengcheng Formation in the Junggar Basin; China

CCPortal

DOI	10.1306/01301917414
	Depositional environments in an arid; closed basin and their implications for oil and gas exploration: The lower Permian Fengcheng Formation in the Junggar Basin; China
	Yu K.; Cao Y.; Qiu L.; Sun P.
发表日期	2019
ISSN	0149-1423
起始页码	2073
结束页码	2115
卷号	103 期号:9
英文摘要	The Fengcheng Formation is a nonmarine, carbonate-dominated succession that formed under arid climatic conditions in a hy-drologically closed basin. Two transects and two seismic profiles were examined, the characteristics and environmental significance of different lithofacies were studied, and a model of depositional environment divisions was proposed. The sedimentary model involved an alkaline lake in which the depositional environments consisted of a shallow saline lake margin, slope, saline lake center, and steep lake margin from northeast to southwest. The perennial central salty lake was located in the southwestern part of the study area, whereas there were widespread, low-gradient lake margins in the northeast, east, southeast, and southern parts of the study area. Lake-level fluctuations had a major influence on the shallow saline lake system and complicated the depositional environments in these areas. The deposits are derived from bedrock reworking, volcanic eruptions, and authigenic minerals that precipitated from brine during the hypersaline phase. Fine-grained terrigenous clastic sediments, volcanic ashes and dusts, and authigenic minerals mixed in the depocenter (concentration center of the brine pool), which was covered by high-salinity brines, and the depositional environment was anoxic as a result of salinity-based brine stratification. A thick sodium carbonate succession occurred in the depocenter of the ancient Mahu lake, where bedded sodium carbonate alternated with fine-grained, organic-rich tuff or tuffaceous hydrocarbon source rocks. Microorganisms bloomed in the alkaline, high-salinity brine, and the organic matter was well preserved, which is similar to those modern alkaline saline lakes in eastern Africa and western North America. Thus, the Permian Fengcheng Formation contains source rocks that formed in an alkaline saline lake. Copyright © 2019. The American Association of Petroleum Geologists. All rights reserved.
语种	英语
scopus关键词	Carbonation; Deposition; Petroleum prospecting; Sodium Carbonate; Sodium compounds; Volcanoes; Climatic conditions; Depositional environment; Environmental significance; Fengcheng formations; High salinity brines; Hydrocarbon source rocks; Lake level fluctuations; Oil and gas exploration; Lakes; alkalinity; arid region; authigenic mineral; bedrock; carbonate; clastic sediment; climate conditions; depositional environment; hydrocarbon exploration; lacustrine environment; lake level; lithofacies; precipitation (chemistry); seismic data; terrigenous deposit; volcanic eruption; Africa; China; Junggar Basin; North America; Xinjiang Uygur
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/143786
作者单位	School of Geosciences, China University of Petroleum, Qingdao, Shandong, China; Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao, China
推荐引用方式 GB/T 7714	Yu K.,Cao Y.,Qiu L.,et al. Depositional environments in an arid; closed basin and their implications for oil and gas exploration: The lower Permian Fengcheng Formation in the Junggar Basin; China[J],2019,103(9).
APA	Yu K.,Cao Y.,Qiu L.,&Sun P..(2019).Depositional environments in an arid; closed basin and their implications for oil and gas exploration: The lower Permian Fengcheng Formation in the Junggar Basin; China.AAPG Bulletin,103(9).
MLA	Yu K.,et al."Depositional environments in an arid; closed basin and their implications for oil and gas exploration: The lower Permian Fengcheng Formation in the Junggar Basin; China".AAPG Bulletin 103.9(2019).