Origin of Carbonate Cement in Reservoirs of Ledong Area, Yinggehai Basin and Its Geological Significance

被引：0
|
作者：
Wu S. [1 ]
Fan C. [1 ]
Zhao Z. [1 ]
Dai L. [1 ]
Deng X. [1 ]
Zhong J. [1 ]
机构：
[1] Zhanjiang Branch of China National Offshore Oil Corporation Ltd., Zhanjiang
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2019年 / 44卷 / 08期
关键词：
Ancient seawater temperature; Carbon and oxygen isotopes; Carbonate cement; Petroleum geology; Yinggehai Basin;
D O I：
10.3799/dqkx.2019.154
中图分类号：
学科分类号：
摘要：
In order to explore the distribution law, formation mechanism and its effect on reservoir quality in Ledong District, a comprehensive study of petrology and geochemistry was carried out on the characteristics of cast thin sections, carbon and oxygen isotopes, and inclusions of carbonate cement. The results show that the carbonate cement content from the slope to the depression center has been reduced from 18.0% to 5.0%, and its δ13C value is distributed in the range of -4.78‰~+1.03‰, theδ18O value is distributed in the range of -10.99‰ to -6.34‰, Z Values range from 111.27 to 123.59,ancient sea water temperature is distributed in the range of 11.36 ℃ to 32.02℃, ancient salinity is distributed in the range of 3.24% to 6.91%. It is found that the formation of carbonate cement is mainly related to the dissolution and precipitation of carbonate rock or high calcareous sandstone, which is controlled by the water medium temperature, the formation temperature and salinity. From the slope to the depression center, the water medium temperature is reduced, the salinity is increased, and the bond is weak. Low-content early (iron) calcite and high temperature hot fluid dissolved early (iron) calcite produced by low or high content of late (iron) dolomite areas can develop medium-permeability "sweet spot" reservoirs. © 2019, Editorial Department of Earth Science. All right reserved.
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页码：2686 / 2694
页数：8
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