Characteristics and significances of carbonate cements in northern Mahai region,northern margin of Qaidam Basin

Sun Guoqiang; Ma Jinye; Wang Haifeng; Chen Ji; Zhang Yongshu; Jia Yanyan; Zhang Shengyin; Shi Ji'an

doi:10.11781/sysydz201202134

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Sun Guoqiang, Ma Jinye, Wang Haifeng, Chen Ji, Zhang Yongshu, Jia Yanyan, Zhang Shengyin, Shi Ji'an. Characteristics and significances of carbonate cements in northern Mahai region,northern margin of Qaidam Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2012, 34(2): 134-139. doi: 10.11781/sysydz201202134

Citation:

Sun Guoqiang, Ma Jinye, Wang Haifeng, Chen Ji, Zhang Yongshu, Jia Yanyan, Zhang Shengyin, Shi Ji'an. Characteristics and significances of carbonate cements in northern Mahai region,northern margin of Qaidam Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2012, 34(2): 134-139. doi: 10.11781/sysydz201202134

Citation:

Sun Guoqiang, Ma Jinye, Wang Haifeng, Chen Ji, Zhang Yongshu, Jia Yanyan, Zhang Shengyin, Shi Ji'an. Characteristics and significances of carbonate cements in northern Mahai region,northern margin of Qaidam Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2012, 34(2): 134-139. doi: 10.11781/sysydz201202134

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Characteristics and significances of carbonate cements in northern Mahai region,northern margin of Qaidam Basin

doi: 10.11781/sysydz201202134

1.
Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China
2. Exploratory Development Institute of Qinghai Petroleum Administration, PetroChina, Dunhuang, Gansu 736202, China
3. Graduate University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2011-06-29
Rev Recd Date: 2012-02-07
Publish Date: 2012-03-28

Abstract

Abstract

Based on lithology,mineralogy and geochemistry,the generation environment and source for carbonate cements in sandstone reservoirs in the lower position of the Paleogene Lower Ganchaigou Formation in the north of the Mahai Uplift which located in the northern margin of the Qaidam Basin were studied systematically.Two types of calcite cements were found,including xenomorphic micrite and hypidiotopic microcrystalline.Their carbon isotope values (δ¹³C) ranged from -7.1‰ to -3.3‰ with the average of -4.9‰,and the oxygen isotope values (δ¹⁸O) ranged from -11.3‰ to -9.6‰ with the average of -10.3‰.The Z-values of paleosalinity ranged from 107.0 to 115.6 and the average value was 112.1.The generation of carbonate cements in sandstone reservoirs in the study area might be related to the decarboxylation of organic matters during the early diagenetic stage.A little organic carbon also participated in the reaction.Diagenetic fluids mainly came from clast and atmospheric freshwater.
- carbon isotope,
- oxygen isotope,
- carbonate cement,
- Lower Ganchaigou Formation,
- Mahai Uplift,
- Qaidam Basin

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References(30)

References

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Characteristics and significances of carbonate cements in northern Mahai region,northern margin of Qaidam Basin

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Characteristics and significances of carbonate cements in northern Mahai region,northern margin of Qaidam Basin

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