塔中地区下奥陶统鹰山组白云岩成因研究
网络出版日期: 2012-02-20
基金资助
国家科技重大专项“塔中北斜坡奥陶系碳酸盐岩沉积储层研究”(编号:208ZX05049)资助
Origin of dolomite of Lower Ordovician Yingshan Formation in Tazhong area
Online published: 2012-02-20
赵小龙 , 刘向君 , 刘道杰 . 塔中地区下奥陶统鹰山组白云岩成因研究[J]. 岩性油气藏, 2012 , 24(1) : 20 -25 . DOI: 10.3969/j.issn.1673-8926.2012.01.004
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.
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