Research on relationship of Late Palaeozoic dolomite to sequence evolution and reservoir characteristics of dolomite in Youjiang Basin, Guangxi

Taking the dolomite of Late Palaeozoic Era in Youjiang Basin as example, this paper researches in detail the distribution and shapes of the dolomite in profiles which include five types: (1) siliceous dolomite and interbeded silica rock; (2) dolomite and interbeded calcareous mudstone; (3) ataxitic dolomite and interbeded shelly microcrystallite limestone; (4) dolomite and interbeded biologic limestone; (5) dolomite and interbeded dolomitized limestone. The paper also discusses the relationship of dolomite distribution to sequence evolution that is the petrology feature of dolomite in different system tracts and studies the reservoir characteristics of different types of dolomite and dolomite in difference system tracts.