The Sedimentary Characteristics And Significance Of The Event Of The Sinian And Ordovician System In Kuruketage Region Of Northeast Tarim

This paper selected the Sinian and Ordovician System in Northeast Tarim Kuruketage region as the research object.O n the base of observation and description of the section plane in the field of the Sinian and Ordovician System in the region, we studied on the development and the feature of the event deposition of the region,in order to provide the basis for oil and gas exploration and development in Tarim Basin.We conclude the following through consulting a large number of literature, combined with field survey results:the late Sinian of Kuruketage region mainly deposited shallow sea facies and semi deep sea marine facies,in the southeast of the studying area, Q ueerqueke-Yingpan site mainly deposited semi-deep and deep sea facies,south of Yuli County in the southwestern part of the studying area mainly deposited shallow sea facies, north of the northeastern Wuligezitage Mountain mainly deposited shallow sea facies.The early Ordovician in the studying area mainly deposited shale basin and open platform facies,the Middle Ordovician mainly deposited deepwater turbid ite basin to platform and platform margin clastic shore facies,late Ordovician mainly deposited clastic shore- slope- shelf- open platform to platform edge facies.The Hangererqiaoke Formation deposit tillite, containing dropstones, mud lines, defined as the shallow sea-glacier facies;the Shuiquan Formation deposit dark gray or gray silty, dolomitic limestone, the Yukengou Formation group deposit gray green and yellow green silty sandstone intercalated with marls, defined as shallow sea facies;the Zhamotike Formation deposit yellow green sandstone and basalt, defined as abyssal facies.The Ordovician System in the northern part of the studying area has a sequence of sedimentary facies of carbonate rocks which is upward and shallow,open continental shelf to shelf platform edge to open platform half restricted platform facies;The southern edge of the basin has a facies of deep water basin facies to urbidite basin starvation subfacies to deep-water clastic continental shelf to shallow water clastic continental shelf;,The Heituao Formation deposit gray micrite and dark gray, black mudstone interbedded.dark gray, Black mudstone developed a submarine fan intermission, in deep shelf environment t in the upper Queerqueke Formation.The Hangeerqiaoke Formation in the late Sinian System formed a special tillite after going through glaciation events,consisting of coarse gravel, silt and mud.At the same time, it also has some special structures, such as the glacier drift gravel, the dropstones, etc..Turbid ite rocks are widely developed in the Queerqueke Formation of the late Ordovician System,which are mainly a set of terrigenous clastic turbidite.Submarine fan turbidite was deposited in Seoul, Yardang mountain, Mt. Yuanbaoshan section in Upper Ordovician,which is composed of the block sand, conglomerate, powder sandstone...