Sedimentary Microfacies And Reservoir Modeling Study Of Fault-block A 3 In A'nan Oilfield

The research area fault-block A 3 is the main block of A'nan Oilfield.Taking A?oil group of A 4 Member and T? oil group of Lower Teng 1 Member as the target horizons,based on theories of sedimentary petrology,structural geology,logging geology,and geological statistics,this paper makes full use of core observation,logging interpretation,seismic and analysis assay data etc.to carry out research of thin layer division and correlation,fine structural interpretation,sedimentary microfacies and three-dimensional geological reservoir modeling.Through the method of well-seismic combination,the target horizon can be divided into 31 thin layers,and the plane combination of 9 main faults is verified.Middle-fan of subaqueous fan and coastal-shallow lake subfacies are the two main deposits developed in this area.Middle-fan subfacies can be further divided into channel,inter-channel,channel flank and channel edge 4 microfacies,and coastal-shallow lake subfacies includes muddy dolomite flat,sands beach and mudflat 3 microfacies.Vertical and horizontal distribution analysis of sedimentary microfacies by the unit of thin layers indicates on the whole the sea level first increased and then decreased.Based on the above research,under the guidance of "facies-controlled modeling” the geological modeling software Petrel was applied to establish the structural model,sedimentary facies model and reservoir property model of the target horizon in the research area.This can provide a reliable basis for implementing further geological study and adjusting development plan of fault-block A 3.