Study On Quasi-phase-penetration Calculation And Influence Mechanism Of Typical Fracture-cavity Mode

Carbonate fracture cave reservoir is widely distributed and rich in resources,which is an important reserve of oil and gas resources in the world.However,due to the strong heterogeneity of fracture hole reservoir,the development of fracture hole reservoir is quite different from that of ordinary sandstone reservoir.At present,most of the research on the development and optimization of fracture-hole reservoir is based on fracture-hole unit,but the reservoir spatial structure in fracture-hole unit is complex and changeable,the flow characteristics are complex,the law is difficult to find,and the overall analysis is very difficult.One of the existing numerical simulation methods for fracture and cave elements considers that the heterogeneous model of fracture and cave is simplified to some extent as a homogeneous model similar to that of sandstone,and the model designed by this method is essentially different from the actual fracture and cave element.The purpose of the other method is to realize the maximum quasi-truth,so that the amount of computation is huge,and the existing hardware can not simulate the reservoir at the actual field scale.In view of the existing problems,the further extraction of seam and hole pattern from seam and hole unit is considered,and the practical problems are solved on the basis of traditional methods.Based on the S48 unit of Tahe Oilfield,according to the existing typical fracture and cave unit model,combined with geological data and development dynamic data,this paper summarizes and divides the typical fracture and cave model.According to the N ? S equation,the numerical experiment of water flooding process in fracture and hole mode is carried out,and the equivalent model is established by commercial numerical simulation software to fit the experimental results,so that the quasi-phase infiltration can be obtained quickly and accurately.The influence mechanism of fracture and hole parameters on its production dynamic characteristics and quasi-phase infiltration characteristics is further discussed.After verifying the feasibility of this method,the research idea is extended to the actual reservoir,and the production dynamic fitting of several obvious fracture and cave unit structures in S48 unit of Tahe Oilfield is carried out,and the parameter optimization scheme is given.Through the research,the calculation method of quasi-phase infiltration of typical fracture-hole mode is put forward,the variation law of quasi-phase infiltration of different fracture-hole modes with the parameters of fracture-hole is studied,and the partition assignment fitting method of fracture-hole unit is put forward.The well groups with poor reservoir fitting are fitted by partition assignment,and the preliminary parameter optimization tests are carried out.