Structure Interpretation And Favorable Trap Selection In Triassic Jiucaiyuanzi Formation In Fudong5 Well Region Of Beisantai Uplift

Beisantai uplift of Eastern Junggar basin belongs to the ancient remnant center is raised,raised by the approximate circular Carboniferous paleo uplift formation,Carboniferous to the Cretaceous strata from the periphery to the high position of thinning and uplift Piching,separate from what Fukang sag and Jimsar sag,South North Sazhang segmentation fault fold and fault zone in Fukang and the tectonic position is special.The oil and gas in Fukang sag and Jimsar sag of the hydrocarbon source rocks of Permian Pingdiquan group migrated up to layer jiucaiyuanzi group.In the course of study for the Fudong5 wells area jiucaiyuanzi formation reservoir sandstone thickness in the eastern Junggar basin thin section,seemingly contiguous sand Body plane is not entirely contiguous,horizontal and vertical features changing characteristic,in the careful observation and careful analysis of the target layer jiucaiyuanzi formation lithology and lithofacies characteristics,physical characteristics,basic structure and bedding structure and fine structural interpretation of 3D seismic data,sedimentary facies analysis of single use well logging facies,and focuses on the analysis of characteristics of main sedimentary microfacies,predict the favorable reservoir distribution in plane and traps recognition mainly through the analysis of seismic attributes and favorable profile inversion plan and section map.Through careful observation of the main objective reservoir wells analysis showed that the jiucaiyuanzi formation in the alluvial fan River under arid climatic conditions in flood plain depositional system,reservoir sandstone mainly abandoned channel deposition intermittent.Mostly sandstone core sandwich,red mudstone with thin sandy gravels,mud much less sand,core analysis for multiple positive rhythm combination,"mud pack sand" feature is obvious.The fine structure of the target horizon interpretation,analysis and stratigraphic features and determine the purpose of fault layer distribution for seismic attributes,subsequent logging,provide a scientific basis for the analysis of single well facies and wave impedance inversion.The purpose layer of Triassic strata and the occurrence of steep jiucaiyuanzi formation of Cretaceous in the whole to the southwest tilt,because the projections of the tectonic movement is violent,the fracture mainly develops in slope,so the slope structure traps.The traps are known that high yield wells drilling information for the reverse fault,high yield wells reservoir sandstone is of high resistivity,high impedance,so it can be through the waves Impedance inversion to predict favorable reservoir and lithology,seismic profiles,well logging information can make fine description of favorable target,so as to optimize the favorable sand body.After a comprehensive analysis of favorable structural and lithologic traps and sand body distribution features of the fine structure interpretation that Beisantai uplift group not only trap garden leek the morphology structure and development,is also affected by the reservoir sand body distribution,the overall structure is composed ofsand under the control of the reservoirs,on the whole channel sand bodies developed,good reservoir properties,and structure,formed the favorable oil and gas accumulation areas.The area with multi system oil drilling,in order When choosing the target,we should try to take into account other layers at the same time as the main layer,so as to reduce drilling risk.