气候变化领域集成服务门户(CCPortal): Lithofacies and depositional setting of a highly prospective lacustrine shale oil succession from the upper cretaceous qingshankou formation in the Gulong Sag, Northern Songliao Basin, Northeast China

CCPortal

DOI	10.1306/08031817416
	Lithofacies and depositional setting of a highly prospective lacustrine shale oil succession from the upper cretaceous qingshankou formation in the Gulong Sag, Northern Songliao Basin, Northeast China
	Liu B.; Wang H.; Fu X.; Bai Y.; Bai L.; Jia M.; He B.
发表日期	2019
ISSN	0149-1423
卷号	103 期号:2
英文摘要	The lacustrine shale of the Upper Cretaceous Qingshankou Formation is the principal prospective unconventional target lithology, acting as source, reservoir, and seal. Lithofacies and associated storage capacity are two significant factors in shale oil prospectivity. This paper describes an investigation of the lower Qingshankou Formation lacustrine shale based on detailed description and analysis of cores, shale lithofacies characteristics, depositional setting, and stacking patterns. Seven lithofacies are recognized based on organic matter content, sedimentary structure, and mineralogy, all exhibiting rapid vertical and lateral changes controlled by the depositional setting and basin evolution. An overall trend from shallow-water to deep-water depositional environments is interpreted from the characteristics of the infilling sequences, characterized by increasing total organic carbon (TOC) and total clay content and decreasing layer thickness (i.e., from bedded to laminated then to massive sedimentary structures). Periods of deposition during shallowing cycles show a reverse trend in the sedimentary characteristics described above. The sedimentary rocks in the studied interval showthree complete short-termcycles, each one containing progressive and regressive system tracts. Massive siliceous mudstones with both high and moderate TOC are considered to have the best hydrocarbon generation potential. Laminated siliceous mudstones, bedded siltstones, and calcareous mudstones with moderate and low TOC could have the same high hydrocarbon saturations as the high-TOC massive siliceous mudstones, but these lithologies contain more brittle minerals than the massive mudstones. Several siltstone samples show low or zero saturation of in situ hydrocarbons; this is considered to be related to a combination of fair to poor hydrocarbon generation potential and extremely low permeability, limiting migration. Moderate-TOC laminated siliceous mudstones were also observed to have connective pore-fracture networks. It can be demonstrated that successive thick sequences of moderate-TOC laminated siliceous mudstones, showing high volumes of hydrocarbon in situ, a high mineral brittleness index, and good permeability, combine to form shale oil exploration "sweet spots". © 2019. The American Association of Petroleum Geologists.
语种	英语
scopus关键词	Deposition; Fracture mechanics; Hydrocarbons; Lithology; Minerals; Organic carbon; Petroleum prospecting; Sedimentology; Depositional environment; Depositional setting; Hydrocarbon generation potential; Hydrocarbon saturation; Organic matter content; Sedimentary characteristics; Sedimentary structure; Total Organic Carbon; Sedimentary rocks; basin evolution; Cretaceous; hydrocarbon generation; hydrocarbon migration; lithofacies; mudstone; oil shale; organic matter; saturation; sedimentary structure; siltstone; total organic carbon; China; Songliao Basin
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/125034
作者单位	Accumulation and Development of Unconventional Oil and Gas, State Key Laboratory Cultivation Base, Northeast Petroleum University, Daqing, China; State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, China; Department of Earth Science, Northeast Petroleum University, Daqing, China; PetroChina Daqing Oilfield Company, Daqing, China
推荐引用方式 GB/T 7714	Liu B.,Wang H.,Fu X.,et al. Lithofacies and depositional setting of a highly prospective lacustrine shale oil succession from the upper cretaceous qingshankou formation in the Gulong Sag, Northern Songliao Basin, Northeast China[J],2019,103(2).
APA	Liu B..,Wang H..,Fu X..,Bai Y..,Bai L..,...&He B..(2019).Lithofacies and depositional setting of a highly prospective lacustrine shale oil succession from the upper cretaceous qingshankou formation in the Gulong Sag, Northern Songliao Basin, Northeast China.AAPG Bulletin,103(2).
MLA	Liu B.,et al."Lithofacies and depositional setting of a highly prospective lacustrine shale oil succession from the upper cretaceous qingshankou formation in the Gulong Sag, Northern Songliao Basin, Northeast China".AAPG Bulletin 103.2(2019).