The Small Scale Sequence Stratigraphy of The Ordovician Carbonate of the Sangtamu Horst in The Tarim Basin

Key words: 
• sequence stratigraphy /
• Carbonate platform /
• Tarim Tasin /
• Ordovician

Abstract: In this paper, the small scale Ordovician carbonate sequence stratigraphy was discussed based on theanalysis of stratigraphy and sedimentology of the Sangtamu horst Block which belongs to the first gradetectonic unit—— Tabei Rise Belt in Tarim Basin.The small scale means the local structure of the studedarea and the subordinate sequence of the studied range are relatively small.A large amount of laata, such as olgging, core, outcrop and paleontology, was utilized to constructvariation curve of relative water depth under the circumstance of the vestrict of the seismic resolution.The conclusions were as belows: ① The open platform-edge sedimentary system includes ten sedimentarytypes: algal lagoon, algal flat, oolitic shoal and so on.② The Ordovician system is classified into twofourthorder sequences in TypeⅠ sequence boundary and the corresponding fifth-order dequences are alsoclassified.③ The highstand systems tract is the best reservoir belt witout considering the anadiagenesisfactor.This snalysis made it possible to recognize the evolution of strata and facies in local structure and toforecast the distribution tendency of the reservoir.The achivenent of this study can be applied in theanalogy of other similar structures.