Study On The Tectonic Evolution Characteristics Of Hanliu Fault Zone

This thesis is comprehensively utilizing geology,seimic data and well-logging data and so on,applying methods of equilibrium profile,thickness analysis,numerical simulation by means of ANSYS,investigating a great quantity of literature.Finally we made structural evolution profiles,analyzed the activity of faults,defined the development of lower-order faults and we analyzed how faults,tectonic stress field and fractures controls on hydrocarbon reservoir.According to the results of seismic data interpretation,planar and profile fault geometric characteristics,fault cutting horizons and fault occurrence changes on the Hanliu Fault's downthrown side were analyzed.On the plane,these faults combination styles mainly have parallel style,oblique crossing style and pinnate style.On the profile,the faults combination styles mainly have ladder-like style,“Y”-like style and horst-like style.By analyzing the intensity of fault activity intensity and main faults' forming time,we can conclude that in Paleogene faults acted mainly in Dainan-Sanduo period generally in Hanliu Fault Zone.In Dai-2,Duo-1 and Duo-2 periods,the fault activity intensity has the characteristic of strong-acting east and weak-acting west.Sanduo period is faults' activity is the strongest period.From Fu-1 period to Fu-3 period,Da-1 fault formed,active faults were few,which are controlled by zhen(1)fault.Hanliu fault and Wei-5 fault formed in Fu-4period.In Dainan period,many active faults formed and they acted intensively.During Dai-2period,smaller faults and compression anticline formed,the anticline was complicated.During Sanduo period,rollover anticline formed and was complicated by smaller faults,the compression anticline and faults developed continuously.Through analyzing fault extension amount,the study area stretched weakly in Funing period and,it stretched strongly in Dannan-Sanduo period.In Funing period and in Sanduo period,the minimum principal stress in Hanliu Fault Zone was always tensile stress.In Funing period,the south part of wei-5 fault was the negative-value region of shear stress where NEE faults developed,the north part of wei-5fault was the positive-value region of shear stress where nearly EW faults developed.InSanduo period,in the south part of hanliu fault,the shear stress were positive and NW?nearly EW faults developed,the north part of hanliu fault was the negative-value region of shear stress where nearly NE faults developed.The research suggested that in paleogene,Hanliu fault system evolved from simple to complex.The structural evolution were classified into four stages: zhen(1)fault controlling stage from Fu-1 period to Fu 3 period;formation and development of Hanliu fault and the formation of compression anticline from Fu-4 period to Dai-2 period;double fault controlling depression and the formation of rollover anticline development stage from Duo-1 period to Duo-2 period;stable subsidence stage since Yancheng period.Fault activity intensity influenced formation thickness.Comparing distribution graph of fault slope breaks and distribution graph of sandbodies we can conclude the former influenced the latter.Comparing tectonic stress field simulation results,fracture permeability parameter simulation results and distribution of hydrocarbon reservoirs can prove the former influenced petroleum migration and accumulation.