Sedimentary facies of carbonate rocks of the Paleogene and Neogene in western Qaidam Basin
Zhang Min Yin Chengming Shou Jianfeng Chen Ziliao Zhang Yuezhong
1 Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,Guangdong
2 Hangzhou Institute of Geology,Hangzhou 310023,Zhejiang
3 Qinghai Oilfield Company,PetroChina,Dunhuang 736202,Gansu
Lacustrine carbonate rocks of the Paleogeneand Neogene in western Qaidam Basin are mainly distributed from the upper member of the Xiaganchaigou Formation to Youshashan Formation,and more developed in the upper member of the Xiaganchaigou Formation and Shangganchaigou Formation There are three types of carbonate rocks,including micrite limestones,algal limestones and grain limestones in western Qaidam BasinThe diamictites resulting from the mixing of lime,dolomite and terrigenous clastics are widely distributed Carbonate sedimentary facies include lime mud flats and algal flats in littoral lake,grain banks in shallow lake,algal mounds in shallow lake and marls in semideep lakeetc The typesof carbonate rocks of limemud flats in littoral lake mainly include micritic limestones,micrite limestones with terrigenous clastics and marls with terrestrial clasticsetc Those of algal flats in littoral lake mainly include algal micrite limestones and algal laminar limestones and algal micrite limestoneswith terrestrial clasticsThose of grain banks in shallow lake mainly include ooid limestones with spar or micrite,bioclastic limestones,intraclastic limestones and grain limestones Those of algal mounds in shallow lake mainly include algal stromatolitic limestones, algal clast limestones, algal micrite limestones and algalmicrite limestones with terrestrial clastics Those of marls facies in deep lake mainly include micrite limestones, marls, micrite limestones or marls with little mud and silt Carbonate sedimentary facies show a strong migration trend from southwest to northeast
About author: Zhang Min,born in 1962,was graduated from Qinghai College of Industry and AgricultureNow,he is a senior engineer at Qinghi Oilfield Company and a candidate for PhDdegree in Guangzhou Institute f Geochemistry,Chinese Academy of Sciences,and is engaged in petroleum geology
Cite this article:
. Sedimentary facies of carbonate rocks of the Paleogene and Neogene in western Qaidam Basin[J]. JOURNAL OF PALAEOGEOGRAPHY, 2004, 6(4): 391-400.
. Sedimentary facies of carbonate rocks of the Paleogene and Neogene in western Qaidam Basin[J]. JOPC, 2004, 6(4): 391-400.