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THE BREAKUP OF THE ORDOVICIAN YINGSHAN FORMATION AND THE LOWER-MIDDLE ORDOVICIAN BOUNDARY IN THE TARIM BASIN

Xiong Jian-fe

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Abstract

The Yingshan Formation is part of the upper Qiulitag Group in the northeast Tarim Basin.Because the Yingshan Formation is widely distribution,and it is an important carbonate reservoir,its stratigraphic subdivision and correlation is very important.According to international standard,the Lower-Middle Ordovician boundary is defined at the first appearance of the conodont Bartoniodus triangularis.However,B.triangularis has not yet been found in Tarim carbonate platform facies.Thus,we suggest to use the first appearance of Pteracontiodus exilis to define the Lower-Middle Ordovician boundary within the Yingshan Formation.Accordingly,the Yingshan Formation is broken up into two formations in order to improve the precision of Ordovician stratigraphic correlation for oil and gas exploration in the Tarim Basin

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What this paper is about

The Yingshan Formation is part of the upper Qiulitag Group in the northeast Tarim Basin.Because the Yingshan Formation is widely distribution,and it is an important carbonate reservoir,its stratigraphic subdivision and correlation is very important.According to international standard,the Lower-Middle Ordovician boundary is defined at the first appearance of the conodont Bartoniodus triangularis.However,B.triangularis has not yet been found in Tarim carbonate platform facies.Thus,we suggest to use the first appearance of Pteracontiodus exilis to define the Lower-Middle Ordovician boundary within the Yingshan Formation.Accordingly,the Yingshan Formation is broken up into two formations in order to improve the precision of Ordovician stratigraphic correlation for oil and gas exploration in the Tarim Basin

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Available abstract

The Yingshan Formation is part of the upper Qiulitag Group in the northeast Tarim Basin.Because the Yingshan Formation is widely distribution,and it is an important carbonate reservoir,its stratigraphic subdivision and correlation is very important.According to international standard,the Lower-Middle Ordovician boundary is defined at the first appearance of the conodont Bartoniodus triangularis.However,B.triangularis has not yet been found in Tarim carbonate platform facies.Thus,we suggest to use the first appearance of Pteracontiodus exilis to define the Lower-Middle Ordovician boundary within the Yingshan Formation.Accordingly,the Yingshan Formation is broken up into two formations in order to improve the precision of Ordovician stratigraphic correlation for oil and gas exploration in the Tarim Basin

Key concepts: Ordovician, Geology, Conodont, Tarim basin, Paleontology, Facies, Carbonate, Carbonate rock

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THE BREAKUP OF THE ORDOVICIAN YINGSHAN FORMATION AND THE LOWER-MIDDLE ORDOVICIAN BOUNDARY IN THE TARIM BASIN — Research Paper | ScholarLens