塔中地区下奥陶统鹰山组白云岩成因研究  

Origin of dolomite of Lower Ordovician Yingshan Formation in Tazhong area

作　　者：王振宇[1] 杨柳明[1] 马锋[2] 杨柳燕[2] 臧诗清[1] 罗新生[3] 

机构地区：[1]西南石油大学资源与环境学院 [2]中国石油勘探开发研究院 [3]中国石油塔里木油田分公司勘探开发研究院

出　　处：《岩性油气藏》2012年第1期20-25,共6页Lithologic Reservoirs

基　　金：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

摘　　要：塔中地区下奥陶统鹰山组作为塔里木盆地海相碳酸盐岩油气勘探的重要层系,发育大量白云岩优质储层,但受白云岩埋藏深度大、勘探程度低等因素的影响,对其成因方面的认识有待深入研究。文中利用8口井的钻井取心资料,对鹰山组白云岩的岩石学特征及地球化学特征进行了分析。结果表明:研究区发育5种类型的白云岩,白云岩的C和O同位素偏轻,Sr同位素含量较高。结合微量元素、阴极发光等地化特征,认为鹰山组白云岩具有深埋藏、热液和近地表蒸发海水成因。Yingshan Formation of Lower Ordovician in Tazhong area of Tarim Basin becomes an important object for marine earhonate rocks exploration, and it developed large amounts of qualified dolomite reservoirs. Due to the deep burial and low degree of exploration of dolomile, the cognilion of its origin is not perfect. The well drilling data from 8 wells were applied to analyze tile pelrology and geochemistry characteristics of the dolomite of Yanshan Formation. The result shows thai there developed 5 types of dolomites： the C and O isotope is generally negative and Sr isotope is positive. Combined with trace elements, cathodoluminescenee and other geochemistry charaeteristics, it was considered that there are three origin mechanisms, including deep burial origin, hydrothermal origin and near surfaee evaporation seawater origin.

关 键 词：鹰山组 白云岩 成因模式 地球化学特征 塔中地区 

分 类 号：P581[天文地球—岩石学]