Origin of dolomite of Lower Ordovician Yingshan Formation in Tazhong area
Online published: 2012-02-20
Yingshan Formation of Lower Ordovician in Tazhong area of Tarim Basin becomes an important object for marine carbonate rocks exploration, and it developed large amounts of qualified dolomite reservoirs. Due to the deep burial and low degree of exploration of dolomite, the cognition of its origin is not perfect. The well drilling data from 8 wells were applied to analyze the petrology and geochemistry characteristics of the dolomite of Yanshan Formation. The result shows that there developed 5 types of dolomites; the C and O isotope is generally negative and Sr isotope is positive. Combined with trace elements, cathodoluminescence and other geochemistry characteristics, it was considered that there are three origin mechanisms, including deep burial origin, hydrothermal origin and near surface evaporation seawater origin.
ZHAO Xiaolong , LIU Xiangjun , LIU Daojie . Origin of dolomite of Lower Ordovician Yingshan Formation in Tazhong area[J]. Lithologic Reservoirs, 2012 , 24(1) : 20 -25 . DOI: 10.3969/j.issn.1673-8926.2012.01.004
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