Research On The Reservoir Geological Modeling Of Saertu And Putaohua Reservoir In Xingshugang Oilfield

At present,"three high and two low"problems in Xingshugang Oilfield of Daqing are becoming increasingly prominent,and the understanding of reservoir heterogeneity needs to be improved urgently.The original geological model of simple subfacies and microfacies has been difficult to meet the needs of development,so it is particularly crucial to establish a fine geological model based on reservoir configuration.In addition,with the deepening of oilfield development,the reservoir properties,micropore structure and heterogeneity have changed.Early development geological model can no longer meet the needs of oilfield development.It is urgent to establish reservoir dynamic models at different development stages to characterize the spatial variation characteristics of reservoir parameters in three dimensions,so as to provide reliable theoretical basis for later reservoir numerical simulation and remaining oil potential tapping.The core of reservoir configuration modeling is to characterize spatial distribution patterns of the different levels of configuration units.This study mainly chooses appropriate reservoir geological modeling methods according to the different configuration morphological parameters.In view of the characteristics of narrow and thin distributary channel in delta front,consider fully the modern sedimentary characteristics of Poyang Lake and geological knowledge base,establish the training image based on sedimentary model and use the probability volume conditional constraint based on block kriging,utilize multi-point geostatistics to quantitative characterize the spatial distribution pattern of underwater distributary channel.According to the inhomogeneity of sheet sands type in delta front and the irregular distribution pattern,make full use of core,logging and geology data to classify three types of sheet sand,use sequential indicator simulation method to characterize the spatial distribution characteristics of different types of sheet sands.The laterally accumulated layer developed in the point bar sand of meandering river in the delta plain have the characteristics of poor continuity and complex distribution,determine the meandering river depositional model in the delta plain by fine geological study in dense well network area and establish the training image based on the sedimentary model,use the rotational azimuth at different positions to control the lateral layers direction,realize the mud drape architecture modeling of the meandering river in shallow water delta plain by multi-point geostatistics methods.In order to ensure that reservoir parameters distribution can satisfy the understanding of geological law under the condition of multiple source,the physical properties are modeled by using the sequential Gauss simulation method based on azimuth trend surface under the constraint of configuration unit,controlling the reservoir attributes are reasonably distributed along different source directions.Finally,by the comparison of modeling methods and model testing,it is concluded that the established reservoir geological model has high reliability.In order to study the variation characteristics of reservoir parameters in different development stages,select the P?3₃² sedimentary units with higher development degree to study,use the ensemble kalman filter algorithm to realize the reservoir static parameters(porosity and permeability)real time updating by continuously absorbing and integrating production dynamic data and static model,thus the reservoir dynamic geological models in different development stages are established.The model results are verified by geological model and numerical simulation.The results show that the reservoir dynamic geological model based on ENKF can better reproduce the change characteristics of reservoir parameters in different periods,and as the correction condition of reservoir parameters in reservoir numerical simulation,it reduces the simulation error caused by long iteration of initial geological model,and provides reliable theoretical basis for the later development measures adjustment.