Kongxi buried hill shows following features in the seismic profiles : the structures are asymmetric . there is flexural syncline on the east side and a monocline on the west side . asymmetric repetition of stratigraphic units is present in the drill wells and the dips of beds and faults are gentle . the permo - carboniferous system of both sides almost lie in the same slope and the events of cambrian or upper proterozoic are continuous from east to west . the phenomenas suggest that kongxi buried hill could be a thrust belt been traced which consists of reverse faults . the imbricate faults mainly effect pre - jurassic strata . there are obvious angular unconformity between jurassic - cretaceous system and paleozoic involved deformation of thrust . the thrust front in some place has cut off the beds of jurassic - cretaceous system . the structural style of the thrust structure changes along the strike of the kongxi buried hill 地震和鉆井資料揭露的孔西構(gòu)造帶前第三系潛山的地質(zhì)特征可以歸納為:構(gòu)造帶總體上不對稱構(gòu)造帶內(nèi)部有地層重復現(xiàn)象石炭二疊系地層的位置明顯高于兩側(cè)的同一地層的高度。用由34條向東傾斜的逆沖斷層組成的疊瓦扇構(gòu)造模式能夠比較合理地解釋上述地質(zhì)特征。該帶向東傾斜的逆沖疊瓦狀斷層組主要影響前侏羅系地層,侏羅白堊系與卷入逆沖構(gòu)造變形的古生界地層之間有明顯的角度不整合。