The Reservoir Modeling In Shahejie Fm Es₃¹ In The Second Region Of Shanghe Oil Field

Shanghe oil field is located on the east of the Linyi Fault in Huimin sag tectonically,is complicated by faults inside and formed a series of multiple fault blocks;The second region of Shanghe oil field is the second fault block from north and the oil and water distribution is sophisticated.With more than 40 years of exploration as well as its complexity of sedimentary structure and the stage of recognition,the horizontal injection-production well network is not perfect in this study area at present and the interlayer contradiction is prominent.According to the theories of reservoir geology,sequence stratigraphy,underground geology of oil and gas field and theory of fine reservoir description,with the methods of fine division and contrast of small layers,sedimentary microfacies and reservoir characteristics of reservoir,structural study and 3D reservoir modeling and so on,3D reservoir model was set up in the study region.Lacking core well in the studying formation,the core well data and logging data of adjacent zones and formations are invited into this study,using equal elevation sedimentation time unit method and sedimentary cycle lithology thickness method,5 sand formations and 22 single sand layers are divided,setting up a fine stratigraphic framework in the starting area.By using of seismic data,according to the technology of coherence technique and seismic section interpretation technique,fault and layer tracing are engaged,distinguishing 12 main faults and 6 levels.Using core data from adjacent areas and previous research results as well as logging curves and seismic attributes,it is inferred that the area developed delta front subfacies to turbidite fan facies mainly,such as underwater-distributary channel,underwater natural embankment,estuarine dam,front edge mat,braided channel and so on and the relationship between the microphase and the electrical response of the microphase is established.A total of 7 logging interpretation models for reservoir parameters,such as porosity,permeability and mud content,are established by logging data and all of the wells in the area are explained by the interpretation models.Via the analysis and observation by thin section and scanning electron microscope,combined with result of log interpretation models,analysis of reservoir characteristics from two scales of macro and micro are engaged.It is considered that the mesopore in the reservoir is permeable and the heterogeneity is strong to medium,dominately is medium inhomogeneity.On the basis of good geological preparation,combined with a number of research results,a method of combining deterministic modeling with random modeling is adopted.Using sequential Gauss simulation algorithm under the depositional agreement bundle,with choosing the appropriate variation function,3D reservoir model is established by Petrel;the model is tested by the method of reserve calculation.The precision of the series of models are highly satisfied according to the test.The model can provide effective basis for oil field following development as well as making adjustment of well-network,which can strive to change passive and unfavorable situation of development.