柴达木盆地西部第三系油田水水文地球化学特征

doi:10.11743/ogg20140107

Abstract

Abstract: The elements and hydrogen and oxygen isotope geochemistry analysis of oilfield water in the Tertiary in western Qaidam basin shows high salinity and abundant ions of potassium,boron and lithium of industrial mining grade.The analysis also reveals a hydrogen isotope value distribution of 75.61‰ to 13.35‰ and an oxygen isotope value distribution between -7.68‰ and 10.58‰.Combining these results with chemical analysis of the water,we concluded that the water was of typical terrestrial origin and was sourced from meteoric water,which seeped down along deep faults and was in-fluenced by deep-sourced magmatic fluids during its "deep circulation".The high salinity of the water may be caused by dissolution of saline minerals and their concentration through evaporation.Potassium,boron and lithium are mostly controlled by deep-sourced fluids and ions like Ca²⁺ and HCO₃^- are mainly sourced from dissolution of carbonate minerals.High concentration of calcium ion and low concentration of bicarbonate radical are thought to be linked to replacement of calcite by dolomite and dissolution of calcite.The formation of CaCl₂ type water is therefore inferred as the result of an adequate water-rock reaction and the participation of deep-sourced fluids.It is preliminarily inferred that the Tertiary in Nanyishan area of the basin may be a potential target for exploration of potassium.

Key words: hydrogen and oxygen isotope, geochemical characteristics, oilfield water, Tertiary, western Qaidam Basin

CLC Number:

TE133

Li Jiansen, Li Tingwei, Peng Ximing, Han Yuanhong, Li Zhongping, Ma Haizhou. Hydrogeochemical behaviors of oilfield water in the Tertiary in western Qaidam Basin[J]. Oil & Gas Geology, 2014, 35(1): 50-55.

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Hydrogeochemical behaviors of oilfield water in the Tertiary in western Qaidam Basin

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