Studying Of The Lithologic Trap Identification For Number 2 Of Sangonghe Formation In The East Belt Of Hinterland Of Junggar Basin

The focus of this study is small fault identification and sand body distribution characterization of Jurassic Sangonghe formation in the east belt around depression to the west of well Pen-1.On this basis,we carry out a comprehensive study of geology,understand the reservoir,find out the main control factors,implement the favorable traps and provide deployment recommendations.The study includes the following four aspects: 1.Precise calibration and interpretation,to find out the characteristics of the Sangonghe formation in the Jurassic and the distribution of the faults in vertical and horizontal direction.2.According to the regional geological knowledge,the favorable zone is preliminarily selected.3.Carrying out fine structure research and reservoir prediction of favorable area,and carry out favorable trap target.4.Taking full advantage of drilling data,integrated structure,sedimentary reservoir research,anatomy known reservoirs,find out the main controlling factors and accumulation of oil and gas,to provide well deployment recommendations.Through this research,we have achieved the following understandings: 1.There are two types of faults in this area: the reverse and normal faults.The first type is the deep reverse fault,the fault distance is large,and the seismic profile is quite clear.The other type is normal fault,which can be divided into two stages.A times fracture mainly formed in Yanshan movement period and ends in front of the Himalayan orogeny,fracture characteristics is clear,mainly to connect oil source and flanking blocking effect.Another period of fracture is mainly in the Yanshan movement period,which is the positive fault between the Sangonghe formation of the Jurassic.The seismic profile is not very obvious,which is mainly manifested in the distortion of the phase axis,the jitter or the number of the phase axis,the type of faults is distributed in the Qianshao low convex zone and Mobei.2.Fine structure implemented,the study area is divided into four bands:(1)Mobei convex nuclear portion fault zone;(2)Qianshao low convex zone;(3)Mobei convex zone from the core of a single obique band;(4)The east wing steep slope belt of Mobei convex zone.3.Based on previous studies,fine dissection of Qianshao low convex zone relationship between water and oil and gas wells focus zone reservoir;guide the Qianshao low convex zone with late trap identification and location target deployment.The study mainly carried out two kinds of traps: fault trap and fault lithologic trap,the area of trap target is 375.6km2.The first batch of four traps declared and all through the review,a total area of 130.2km2.After the completion of the deployment of four wells,and they are all demonstrated valid.