Types and Distribution of Grain Shoals in Yijianfang Formation of Fuman Area,Tarim Basin
To clarify the types and distribution of grain shoals in the Middle Ordovician Yijianfang formation in the Fuman area of the Tarim basin,the sedimentary facies and distribution were studied using the core,rock thin section,carbon isotope,logging,and seismic data.The sedimentary facies of the Yijianfang formation in the study area can be categorized into slope-basin,platform margin,and open platform,with the latter two being the principal zones for grain shoal development.The grain shoals which include psammitic shoal,oolitic shoal,bioclastic shoal,and transitional types,generally account for over 80%of the formation thickness,or even over 90%in some well blocks.The distribu-tion of these shallow grain shoals are primarily under the control of sedimentation processes represented by lateral migration in the setting of rapid marine transgression and gradual marine regression.The psammitic shoals and bioclastic-psammitic shoals extensively distributed in the open platform indicates excellent reservoir quality,and they will be significant targets for future petroleum exploration.
Tarim basinFuman areaOrdovicianYijianfang formationcarbonategrain shoal typegrain shoal distribution
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