Seismic Prediction Of The Characteristics And Distribution Of Oil And Gas Transport Layers In The Permian Fengcheng Formation In The Wuxia Area Of The Junggar Basin

Permian Fengcheng Formation in WuXia area at Junggar Basin is the typical deep hydrocarbon reservoirs with autogeny and self-accumulation,which is a hot fields in the deep petroleum exploration.The hydrocarbon migration and accumulation is in connection with fault and reservoir carrier bed.The characteristic of it is very important for the analysis of migration path of petroleum,and then the formation conditions and control factors for petroleum reservoir are identified.Finally the advantageous regions in the area are pointed out.This thesis is based on 3D seismic data of WuXia area.And it has done fine structure interpretation for Permian Fengcheng Formation.The structural shape and fracture characteristics have been realized.The fault is classified according to its development period and characteristics.On this basis,the transporting ability of fault is analysed.Based on the characteristics of well reservoir,the reservoir types and characteristics are analysed.And the seismic reflection feature of the reservoir in Fengcheng Formation has been defined by seismic forward modeling.The feature identification templates of main reservoir are also established.And then the lateral and vertical distribution of the reservoir are set up by the seismic attribute and seismic inversion.Thickness characteristics of reservoirs and distribution feature of property are established on the basis of seismic inversion.The transporting ability of reservoir is evaluted using the method of poroperm factor.Vertical hydrocarbon migration,its distribution area and lateral migration of hydrocarbon is analysed according to the fault and reservoir carrier bed,and then complex migration system is established.At last the favorable areas for exploration of Fengcheng Formation are clear out.The results show:Fengcheng Formation in WuXia area is lower in the south and higher in the north,and there are many fault fold belts from west to east;The fault is divided into firstdegree deep and large faults and secondary-degree faults,which controll the formation of faultfold belts.The first-degree faults are main beds for vertical hydrocarbon migration during the period of fault activities.Meanwhile,the first-degree deep faults take an important part in the lateral plugging of hydrocarbon during the quiet period of fault activities.And the first-degree deep faults can form fault block trap and fault nose trap with the secondary-degree faults,which is conducive to petroleum accumulation.Multiple sets of fault systems have obvious control effects on the reservoir by the the fracture systems.and then the transporting ability is enhanced;On the whole the transporting ability of Fengcheng Formation in WuXia area is better in the west than in the east.And the transporting ability of member-2 of Fengcheng formation is the best,the member-1 is the second,the member-3 is the worst.The best transporting area of member-3 of Fengcheng Formation showed block distribution.The best transporting area of member-2 and member-1 of Fengcheng Formation show area distribution;The prediction complex migration of Fengcheng Formation is as follows:The migration of member-3 of Fengcheng Formation is source rocks to F26-FN3-AIK1 well area and FN1-FN4 well area with reservoir development to F26-FC1-F10-F501 well area with fault development.The migration of member-2 of Fengcheng Formation is source rocks to FC011-F10-FN1-FN4 well area with reservoir development to F26-FC1-F10-F501 well area with fault development.The migration of member-1 of Fengcheng Formation is source rocks to FC011-WU35-F8-AIK1 well area with reservoir development to F26-FC1-F10-F501 well area with fault development.Another path is source rocks to X88-X76 well area with reservoir development to X72-X40-X71-X88-X76 well area with fault development.The best exploration block of member-3 of Fengcheng Formation is located along the F26-FN3-FN1-FN4 well,and along the FC1-WU35-F21-FN4 well in member-2 of Fengcheng Formation,and along the F26-FC1-F19-F501 well in member1 of Fengcheng Formation.The all weaker area is located along X72-X202-X88-X76 well.And the all weakest region is located at BQ1 well area.