Abstract：High?quality reservoirs prediction of fan delta in the Triassic Baikouquan Formation in west slope of Mahu sag,Junggar Basin. Because of the physical properties of fan delta sandstone of Baikouquan Formation in Fengnan area of west slope of Mahu sag vary greatly in space,it is difficult to predict high?quality reservoirs. In this study,under the guidance of sedimentary petrology,seismic inversion and interpretation theory,high?resolution sequence stratigraphy,sedimentary microfacies description and high?quality reservoir seismic inversion are carried out by comprehensive utilization of well logging,core and 3D seismic data. The fourth?order sequence stratigraphic framework of Fengnan area was established,and the filling process of multi?stage transgression and regression in fan delta was identified. The result indicates that the SSQ3 and SSQ5 are the favorable sequences for high?quality reservoirs development. Sedimentary microfacies including distributary channel and inter?channel bay in fan delta plain,subaqueous distributary channel,mouth bar and sheet sand in fan delta front were identified. It was pointed out that fan delta plain is an optimum reservoir facies belt.The reservoir facies?controlled impedance inversion of separated layers in PSTM was carried out by applying the constraints of vertical boundary of high?resolution sequence stratigraphy and lateral boundary of sedimentary facies to improve reservoir prediction accuracy. Five high?quality reservoir development areas are predicted in the sequence of SSQ3 and SSQ5,and three wells were proposed for drill,which was later proven to have industrial oil flow during drilling.
Sang Lin?Xiang,Liu Jun,Wang Gui?Wen et al. High￣quality reservoirs prediction of fan delta in the Triassic Baikouquan Formation in west slope of Mahu sag,Junggar Basin[J]. JOPC, 2020, 22(6): 1053-1064.
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