%A HUANG Peng, LI Xue, GUO Rui %T Research on Petrologic Character and Genetic Mode of Lacustrine Dolomit %0 Journal Article %D 2014 %J Science & Technology Review %R 10.3981/j.issn.1000-7857.2014.2.008 %P 50-56 %V 32 %N 2 %U {http://www.kjdb.org/CN/abstract/article_11258.shtml} %8 2014-01-18 %X The dolomite of the Sha 1 lower submember in Qikou Sag developed under the background of lake expansion. Through microscopic identification and scanning electron microscopy analysis on the dolomite samples in the studied area, it is shown that there are 5 types of dolomites developed in the area, i.e., microcrystalline dolomite, micritic dolomite, argillaceous dolomite, sandy dolomite and calcite dolomite or dolomite limestone. The cathodoluminescence, oxygen isotope and rare earth element analysis reveals two environment causes of the dolomitization: the return of penecontemporaneous penetration of dolomitization and burial diagenetic dolomitization.,Burial dolomitization on the back penecontemporaneous dolomite infiltration usually occurs at the fracture well-developed zone, through the transformation of the deep hydrothermal fluid. Different origins of dolomite developed in different regions in the studied area. These types of dolomite formation and the study on formation of environment greatly promote the dolomite reservoir prediction.