Study On Geological Engineering Integration Of Reservoir Reconstruction In Jinlong 2 Well Area

The tight oil in Jinlong 2 reservoir is rich in oil and gas resources,but the reservoir has a large burial depth,poor physical properties,strong heterogeneity,rapid sand body changes,complex oil-water relations,and difficult reservoir transformation.Conventional reservoir development schemes are very common.It is difficult to make a breakthrough.In view of the above problems,geological modeling based on the geological characteristics of Jinlong 2 and rock mechanics modeling,volumetric fracture simulation and optimization of construction parameters were carried out,and a unique transformation technology for the integration of geological engineering in Jinlong 2 well area was formed:(1)Combining the geological characteristics of the Jinlong 2 reservoir with singlewell drilling and logging interpretation data,and using sequential indication simulation and other means,through the quality control of the lithofacies model,the distribution characteristics of the oil layer are established to conform to the sedimentary facies and conglomerate lithofacies Controlled pore saturation model.(2)Combined with rock mechanics experiments,conduct triaxial strength experiments and uniaxial strength experiments of cores with different lithologies to obtain rock mechanical parameters such as core Young's modulus,Poisson's ratio,and parameters such as in-situ stress.Through the calculation of imaging interpretation results,drilling information,core experiment results,and dipole acoustic waves,the core experiment results are comprehensively scaled to establish a static onedimensional rock profile.Combined with the geological model,one-dimensional rock mechanics analysis,core experiment and other data,iteratively established the rock mechanics model by finite element method.(3)Determine the direction of in-situ stress through induced fractures and wellbore collapse;correct stress calculation parameters through core experiment results;calculate overlying surrounding rock pressure,pore pressure,and maximum horizontal principal stress;combined with deep diagenesis theory,use finite element method and Equivalent medium theory to establish in-situ stress model.(4)Based on the understanding of the Jinlong 2 tight reservoir strata,the natural fracture model and the conglomerate model are directly introduced;closely integrated with the engineering parameters,the true three-dimensional fracture model is established by the discrete element calculation method,and the displacement,liquid volume and sand are comprehensively simulated Compare the engineering parameters to obtain the optimal fracturing construction parameters for the artificial seam.The Jinlong 2 well area geological engineering integrated reservoir reconstruction technology breaks through the conventional reservoir reconstruction method based on the homogeneity model explained by the single well logging curve and the technical limitations of bilateral symmetric fractures,using from geological recognition to reservoir analysis to The integrated platform of hydraulic fracturing simulation,through the three-dimensional visualization of the three-dimensional geomechanical model,to communicate more natural fractures in the reservoir,form a complex and effective fracture network,and increase the circumferential area of the borehole and the seepage area of the distal end of the artificial fracture,Improve single well productivity,optimize the fracturing construction parameters of Jinlong 2 well area,and provide technical support for the development of Jinlong 2 well area.