The Application Of Pre-stack Inversion Technique In Lithologic Reservoir Prediction In The LD Area

Lithologic reservoir exploration and development is a hot spot in the current exploration.In recent years it has been found in oil and gas reservoirs,lithologic growing proportion.With the conventional stereotype reservoirs compared to lithologic reservoir has high hidden,more complex forming rules and exploration difficult and other features.Lithologic reservoir characteristics,generally have low porosity and permeability,strong horizontal and vertical heterogeneity superimposed on the sand and other features.In this paper,the geological characteristics of lithologic reservoirs,combined with LD regional seismic,logging and rock physics and the actual geological data,the establishment of lithologic reservoir geological model and numerical simulation of wave field.Analysis of seismic inversion method lithology and physical property parameter prediction model to analyze the feasibility of pre-stack inversion method,and then verify whether the guidance of practical application.In practical applications,the work area lithologic reservoir prediction.The main contents are as follows:(1)Combined with work area lithologic reservoirs geological characteristics and well data,lithologic reservoir geological model is established.(2)Lithologic reservoir geological model for wave field numerical simulation.and processed to obtain superimposed high-profile and high-resolution,high signal noise ratio preserved amplitude pre-stack gathers data.(3)By lithologic reservoir model to simulate seismic and well data were interpreted horizons,to carry out post-stack inversion and pre-stack inversion work,to be divided lithology,porosity and fluid identification forecast,combined with well data contrast analysis,verify get a better fit.Lithologic reservoir geological model through forward modeling and inversion,to establish an effective working methods.to guide the application of the actual data.(4)Based on lithologic reservoir geological model inversion method is feasible,the actual three-dimensional seismic data using post-stack seismic inversion and pre-stack multiparameter inversion method,lithology discrimination through inversion results,reservoir thickness prediction,porosity prediction,combined with well data contrast analysis and comparison of the reliability of the results,get a better application in the actual data.