塔里木塔中油田上奥陶统良里塔格组滩相  

BANK FACIES FROM THE UPPER ORDOVICIAN LIANGLITAG FORMATION IN THE CENTRAL TARIM OIL FIELD,NW CHINA

作　　者：张园园[1] 王建坡 李越[1] 

机构地区：[1]中国科学院南京地质古生物研究所,南京210008 [2]武汉地质调查中心,武汉430205

出　　处：《微体古生物学报》2015年第1期95-104,共10页Acta Micropalaeontologica Sinica

基　　金：国家科技重大专项"大型油气田及煤层气开发"专题(2011ZX05008-001-B0);国家自然科学基金(批准号:41072002);国家基金委创新研究群体项目(批准号:41221001);国家基金委重大项目第一课题(批准号41290260)的支持

摘　　要：塔里木板块塔中井区上奥陶统凯迪阶良里塔格组的沉积序列由碳酸盐岩台地区礁滩复合体灰岩构成,显示晚奥陶世由高生物多样性形成的暖水浅海域生态组合。根据滩相灰岩的颗粒组成,可次分为生屑为主、生屑-内碎屑混合、内碎屑为主的三大类型,其中灰泥充填和亮晶方解石胶结均有。部分滩相是礁相单元的近源沉积,而内碎屑和生屑经各种营力改造后多以不同比例混合独立形成滩相。滩中的颗粒粒径一般多小于厘米级,仅部分核形石、珊瑚等颗粒可达到砾级,这些滩多堆积于最大风暴浪基面之上的深度。The limestones of the Katian Lianglitag Formation（Upper Ordovician）in the well blocks of Central Tarim Platform,NW China are composed of reef-bank complexes.The paleoecological associations are diverse in biotic structures and thus considered as indicators of a warm and shallow marine setting.The bank faicies are subdivided into the bioclastic,bioclastic-intraclastic mixed and intraclastic types according to the dominated compositions.Micritic filling and spar cementation are both recognized.Some bank units are assigned to the subfacies of the reefs.However,intraclastics and bioclastics reformed in different conditions and mixed in varying proportions are more likely of the key roles for the formation of banks.Grain-sizes are mostly less than centimeters in diameters except some oncolitic grains and corals.These banks were likely formed above the maximum wave-base.

关 键 词：滩相灰岩 良里塔格组 上奥陶统 塔中 塔里木板块 新疆 

分 类 号：P618.13[天文地球—矿床学]