Depression Analysis Of Reservoir Reconstruction Effect Of Fault Activity Of Block Jin 69 In Shulu Depression

The study area is located in the Xicaogu structural belt of the Shulu sag and is mainly controlled by the boundary fault J69 fault,which is a typical re-active fault(that is,a fault that is active after the accumulation period).Studies have shown that the re-activation of faults and the destruction of related seals can seriously affect the integrity of traps.The re-activation of faults can lead to the destruction of caprocks and the leakage of oil and gas.However,the strain distribution is not uniform in different parts of the fault,which This kind of non-uniformity seems to determine whether or not traps bounded by faults can retain oil and gas.In order to better understand the control factors of the strain distribution of reactivated faults,we construct a series of numerical models of mechanical deformation.Through numerical simulation,we systematically study some key control factors(reaction intensity,combination mode,occurrence status)during the process of fault reactivity)How to influence the pattern of strain distribution.Based on the study of structural evolution of Shulu Sag,this paper systematically analyzes the law of fault activity and determines the type,combination mode,occurrence and intensity of active faults.Dissecting typical oil and gas reservoirs,analyzing the relationship between primary and secondary reservoirs and re-active faults.Using sliding trend analysis to calculate the sliding trend of the Jin 69 block,the results show that the current oil and gas accumulation is in the area where the sliding trend value is less than 0.8.Through core sampling and analysis,a triaxial compression test is carried out to measure and calculate rock mechanical parameters such as Young's modulus,dilatancy angle,internal friction angle,cohesion,tensile strength and compressive strength of different lithologies,and establish corresponding geological models Carry out numerical simulation research to determine the magnitude of fracture strain that can be used as a dominant migration path for oil and gas.The results show that when the shear strain value is less than 0.07 and the volume strain value is less than 0.0015,the fracture has a major preservation effect on oil and gas.