气候变化领域集成服务门户(CCPortal): Calcite vein system and its importance in tracing paleowater flow and hydrocarbon migration in the Ordovician carbonates of the Tazhong area; Tarim Basin; China

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DOI	10.1306/04222018285
	Calcite vein system and its importance in tracing paleowater flow and hydrocarbon migration in the Ordovician carbonates of the Tazhong area; Tarim Basin; China
	Jia L.; Cai C.; Wang Z.; Li H.; Liu L.; Luo Q.; Jiang L.
发表日期	2020
ISSN	0149-1423
起始页码	2401
结束页码	2428
卷号	104 期号:11
英文摘要	It is difficult to determine flow pathways of paleofluids in sedimentary basins. Petrography, fluid inclusion, and isotopic compositions from different phases of calcite veins in the Ordovician in the Tazhong area were studied. Our results reveal a complex diagenesis process with two importantly crossformational fluid movements, coupled with three phases of calcite veins (C1, C2, and C3) precipitation and thermochemical sulfate reduction by hydrocarbons. Fluids that precipitated C2 and C3 calcites were saline and enriched in 18O and thus may have originated from underlying evaporates, whereas fluid that precipitated C3 had an additional contribution from 87Sr-rich, Ba-rich, and Zn-rich Precambrian basinal clastic units. Fluid inclusion homogenization temperatures, salinities, and d18Owater values of C2 veins show decreasing trends with increasing distances from strike-slip faults. This may indicate that C2 fluid might migrate into Ordovician carbonate reservoirs through strike-slip faults within 6 km during late Hercynian orogeny (late Permian). The similarly decreasing trends are observed in C3 veins, indicating that the eastern part of No. 1 fault seemed to be the main fluid-flow pathway for C3 calcite precipitation during Himalayan orogeny. Hydrocarbon may have migrated along the similar pathways as supported by (1) abundant primary hydrocarbon-bearing fluid inclusions in the C2 and C3 calcites and (2) well-documented hydrocarbon migration and mixing. This is an ideal case showing how spatial variation in geochemical data from fracture fillings can be used to trace paleowater and likely hydrocarbon flows in sedimentary basins; it thus may be useful in predicting fluid flow and distribution of hydrocarbons in the Tarim Basin and other basins. Copyright © 2020. The American Association of Petroleum Geologists. All rights reserved.
英文关键词	Calcite; Fault slips; Hydrocarbons; Mineralogy; Oil bearing formations; Petroleum reservoirs; Sedimentology; Settling tanks; Strike-slip faults; Sulfur compounds; Calcite precipitation; Carbonate reservoir; Fluid-flow pathways; Homogenization temperatures; Hydrocarbon migration; Hydrocarbon-bearing fluid inclusions; Isotopic composition; Thermochemical sulfate reduction; Flow of fluids; calcite; diagenesis; fluid dynamics; fluid flow; fluid inclusion; hydrocarbon migration; isotopic composition; Ordovician; paleohydrology; Precambrian; precipitation (chemistry); sedimentary basin; vein (geology); China; Tarim Basin; Tazhong; Xinjiang Uygur
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/168679
作者单位	State Key Laboratory of Continental Dynamics and Department of Geology, Northwest University, Xi'an, China; Youth Innovation Team of Shaanxi Universities (Basin Evolution and Energy Minerals), Xi'an, China; Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, College of Earth and Planetary Sciences, Chinese Academy of Sciences, Beijing, China; Key Laboratory of Oil and Gas Resources and Exploration Technology, Yangtze University, Wuhan, China; Institute of Unconventional Oil and Gas, Northeast Petroleum University, Daqing, China; State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, China
推荐引用方式 GB/T 7714	Jia L.,Cai C.,Wang Z.,et al. Calcite vein system and its importance in tracing paleowater flow and hydrocarbon migration in the Ordovician carbonates of the Tazhong area; Tarim Basin; China[J],2020,104(11).
APA	Jia L..,Cai C..,Wang Z..,Li H..,Liu L..,...&Jiang L..(2020).Calcite vein system and its importance in tracing paleowater flow and hydrocarbon migration in the Ordovician carbonates of the Tazhong area; Tarim Basin; China.AAPG Bulletin,104(11).
MLA	Jia L.,et al."Calcite vein system and its importance in tracing paleowater flow and hydrocarbon migration in the Ordovician carbonates of the Tazhong area; Tarim Basin; China".AAPG Bulletin 104.11(2020).