古地理学报2012，Vol.14Issue(1)：21-32,12.
塔里木盆地下奥陶统白云岩类型及其成因
Classification and origin of the Lower Ordovician dolostone in Tarim Basin
摘要
Abstract
Dolostone of the Lower Ordovician in the Tarim Basin is the most practical exploration target. In this paper, based on the Early Ordovician of tectonic, sedimentary, and palaeoclimate setting of the Tarim Basin, considering the former classifications of dolostone according to the structure, the Lower Ordovician dolostone of the Tarim Basin according to the development and occurrence has been classified as; scattered dolomite in limestone, mottled dolomite in limestone, bedded dolostone, and dolostone related to faults, and the content of dolomite in strata decreases upward. Four dolostones have different features of lithology and occurrence, and they can occur superposably. Features of lithology, geochemistry and occurrence of scattered, mottled dolomite in limestone have revealed their origin of shallow burial dolomitization, and bedded dolostone and dolostone related to faults are formed during moderate-deep burial dolomitization. Their origin and occurrence diversity are controlled by the changes of seawater level, seawater property, and burial environment. Dolostone related to faults, which constitutes important reservoirs, appear to be related closely to the faults in origin and/or in occurrence. Furthermore, it is concluded that the burial dolomitization failed to exert the constructive effects on the formation of dolostone reservoir, while the dissolution caused by migration of fluids in late periods is the main origin.关键词
塔里木盆地/下奥陶统/白云岩Key words
Tarim Basin/ Lower Ordovician/ dolostone分类
天文与地球科学引用本文复制引用
乔占峰,沈安江,郑剑锋,胡杰,吴兴宁,陆俊明..塔里木盆地下奥陶统白云岩类型及其成因[J].古地理学报,2012,14(1):21-32,12.基金项目
国家科技重大专项(编号:2011ZX05004-002)资助成果 （编号:2011ZX05004-002）
