Early Silurian Formation Sedimentary Sequence Development And Favorable Zones Prediction Of The Northern Tarim Uplift

The North Tarim uplift is an important oil and gas-bearing district of tarim basin. With the guidance of the theory of High Resolution Sequence Stratigraphy, Sedimentology, Petroleum Geology, Structural Geology, Seismic Sedimentology witch based on 2D and 3D seismic reflection data,well loggings and cores, Early Silurian is divided into 3 third-order sequences witch includes SQ_Skp1,SQ_Skp2, SQ_Stt, which are bonded by unconformities characterized by truncation or onlap contacts and its relevant conformity surfaces.In establishment of chronostratigraphic correlation framework,Combined with logging,core-restricted seismic sedimentology and sedimentary facies, The research indicates that the Estuary-Tidal flat system distributes mainly in the TST of SQ_Stt and SQ_Skp2, Incised valley deposits mainly distributes in the TST of SQ_Skp2, the Castal beach system and delta system mainly distributes in the HST of SQ_Stt and SQ_Skp2 and Shallow shelf depositional system mainly distributes in SQ_Skpl.Depositing system of timespace collocation regulation were mainly controlled by palaeogeomorphic evolvement. palaeogeomorphic evolvement provide an important reference for the comprehensive research deposition system timespace collocation regulation of north tarim uplift Silurian. Delta system mainly distributes in the Slope of Palaeogeomorphology in the Hade area, Caohu depression margin and Yingmai sedimentary slope.The Castal beach system mainly distributes in the Halahatang Flat region, Incised channel mainly distributes in the Halahatang Valley region.Delta front bar and the foreshore, shoreface sands in SQ_Stt and SQ_Skp2 have good reservoir conditions, combined with comprehensive analysis of oil and gas accumulation that Tabei uplift facies belts are:The cut erosion unconformity belt of SQ_Skp2 and SQ_Stt:Tg3 cut erosion unconformity trap belt mainly distributes in the eastern region of Hade, Tg2 cut erosion unconformity trap belt mainly distributes in the Yingmai area; the super-unconformity trap band of SQ_Skp2 around Hade region; SQ_Skp2 coastal sandstone lithologic traps are mainly distributed in Halahatang area;The Lithological trap belt in the LST of SQ_Skp2 whose reservoir are Incised river sandstone mainly distributes in halahatang and Hade area.