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- Title
三水盆地古近系布三段砂岩中 碳酸盐胶结物特征及成因.
- Authors
唐鑫萍; 王冠群; 钱茂路; 张喜满; 杨博贤
- Abstract
In order to study the composition and formation of carbonate cements in the sandstones of 3rd member of Buxin Formation in the Sanshui Basin, rock and mineral identification, diagenetic evolution analysis and isotopic geochemistry analysis are carried out. The results show that carbonate cements in the sandstones are generally iron containing, mainly ferrocalcite and ankerite. The distribution range of carbon isotope(δ13C)values is relatively concentrated, ranging from -6.4‰ to -4.3‰, with an average of-5.6‰. The distribution range of oxygen isotope value(δ18O)is -15.5‰ to -11.2‰, with an average of -13.1‰. Carbon source analysis shows that the formation of the cements was related to organic decarboxylation. The distribution range of the calculated Z value of paleosalinity presents 107.5 to 112.5, with an average value of 109. 3, reflecting that carbonate cements were formed in freshwater environment. The calculated paleotemperature ranges from 78. 5 to 108. 8°C, with an average of 91. 8°C. It is deduced that carbonate cements were generally formed in the early stage of mesodiagenesis. The calculated paleo-burial depth is 1 850-2 800 m, while the present burial depth is 700-1 550 m, which reflects the characteristics of "once deep buried and later uplifted" of sandstone in this section. The average elevation is about 1 200 m.
- Subjects
OXYGEN isotopes; ISOTOPIC analysis; CARBON analysis; SANDSTONE; DECARBOXYLATION; CARBON isotopes
- Publication
Natural Gas Geoscience, 2019, Vol 30, Issue 3, p353
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2018.12.013