川北元坝气田二叠系长兴组白云岩稀土元素地球化学特征及其指示意义

doi:10.7605/gdlxb.2015.03.26

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Abstract Rare earth element(REE)and Yttrium(Y)concents were determined from 49 carbonate samples of the Permian Changxing Formation of Yuanba Gasfield in northern Sichuan Basin,and the results show that the total content of rare earth elements(REE)is generally low(average 1.50×10^-6),which indicates that rock samples were almost without any terrigenous clastics,and not be affected by the deep hydrothermal fluids. Shale-normalized REE characteristics of dolostone including light rare earth element(LREE)depletion,positive La anomalies,negative Ce anomalies(0.49 to 1.08,average 0.75),positive Eu anomalies(0.89 to 46.00,average 4.68) of different degrees and the higher Y/Ho ratios(28.82 to 63.47,average 43.04) recorded seawater-like REE and Y signatures,which show that the dolomitization fluids is reductive seawater derived,and the dolomitization occurred in a burial environment. The brecciated or zebra typical structure of hydrothermal dolostones were not observed in the cores and petrographic thin sections. Flattened structure and the horizontal continuous distribution of dolomite reservoirs and the higher δ¹⁸O value(-7.07‰ to-2.92‰,average -4.95‰)illustrate that no obvious hydrothermal activities occurred in the study area,and the higher degree of positive Eu anomalies have no relationship with the deep hydrothermal fluids. Many elemental sulfurs and sulfur-rich pyrobitumen originated from thermochemical sulfate reduction(TSR) can be observed by scanning electron microscope,which indicates that TSR created an extremely reducing environment of stratal seawater,and then caused the higher degree of positive Eu anomalies,which in turn explains that TSR had a certain dissolution on dolomite reservoirs.

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	Articles by authors
	Yu Xinya
	Li Pingping
	Zou Huayao
	Wang Guangwei
	Zhang Yi

Key words： REE dolostone TSR Sichuan Basin Yuanba Gasfield Permian

Received: 09 October 2014 Published: 01 June 2015

ZTFLH:	P88.24+5
	P9

About author: Yu Xinya,born in 1989,master,is mainly engaged in carbonate reservoir geology and oil and gas accumulation mechanism. E-mail: xinyayu1220@163.com.
About the corresponding author Li Pingping,born in 1980,graduated from China University of Petroleum(Beijing)in 2009 with a Ph.D. degree. Now he is a lecturer in College of Geosciences at the China University of Petroleum(Beijing),and is mainly engaged in carbonate reservoir geology and oil and gas accumulation mechanism. E-mail: lpp@cup.edu.cn.

Cite this article:

Yu Xinya,Li Pingping,Zou Huayao et al. Rare earth element geochemistry of dolostones and its indicative significance of the Permian Changxing Formation in Yuanba Gasfield,northern Sichuan Basin[J]. JOPC, 2015, 17(3): 309-320.

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http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2015.03.26 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2015/V17/I3/309

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