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.
Qiao Zhanfeng,Shen Anjiang,Zheng Jianfeng et al. Classification and origin of the Lower Ordovician dolostone in Tarim Basin[J]. JOPC, 2012, 14(1): 21-32.
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