Study on sedimentary characteristics of Middle Ordovician Keliomori Formation in western Ordos Basin
The Lower Paleozoic Ordovician system in the western Ordos Basin has attracted much attention be-cause of its great potential for oil and gas exploration,and the carbonate rock developed in the Middle Ordovi-cian Keliomori Formation is expected to be the next exploration target layer,so study on its sedimentary char-acteristics can provide geological basis for the exploration of Ordovician gas in the west margin.By means of outcrops investigation,core observation and thin section identification,the characteristics of petrology,sedi-mentary facies types and spatial distribution of the Keliomori Formation are studied.It is shown that the Kelio-mori Formation is mainly composed of thin layer micrite,calcirudyte,calcarenite,calcisiltite,bioclastic lime-stone and black shale.They have micrite structure,granular structure,and thin layer,lamellar,nodular,brecciform structure,slump and Bauma sequence can be seen.The sedimentary facies platform front slope and deep water slop-trough,which are distributed in a narrow strip along the north-south direction.From east to west,the platform front slope facies develops in the open sea platform close to the Ordos base,and rapidly changes into deep water slop-trough facies westward,and the sea water has a gradual deepening trend.
western Ordos BasinOrdovicianKeliomori Formationsedimentary characteristics
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