Reservoir Geological Study Of Middle Es3 In H146 Fault Block In Xianhezhuang Area

The turbidite fan reservoir of middle Es3 in H146 fault block in Xianhezhuang area is characterized as medium porosity,low permeability,strong heterogeneity and complexity distribution of remaining oil.With the development of oil fields,the development contradictions began to highlight.The lack of a clear understanding of the geological characteristics restricts the development and adjustment of late development period in the oilfield.It is badly in need of carrying out fine Geological research.The results can provide guidance and reference for later development and adjustment.First of all,on the basis of the regional sedimentary background,guided by the sequence stratigraphy,establish the stratigraphic framework in the study area.Then,Based on core,well logging,seismic and development performance data,considering a variety of factors such as structure,sedimentary characteristics and oil-water relationship,under the control of the maker bed,adopting the method of “cyclic correlation and graduation control”,the formation of Sha-3 middle submember is divided into 5 sand bed sets and 64 small layers and then the isochronous stratigraphic framework is established.Finally,based on the previous microfacies research,reservoir architecture characteristics and development feature of turbidite fan sandbody are analyzed,especially focused on the configuration and development feature of turbidite channel reservoir.Finally,two typical area are selected to research the architecture's effect on remaining oil.According to the research,the target formation can be divided into lacustrine lowstand system tract,lacustrine transgressive system tract and highstand system tract.The sedimentary facies are mainly turbidite fans of supply channel type and turbidite fans without root.Sand group 4 is mainly channel,and sand group 1-3 are fluxoturbidite whose sandbody is characterized as large quantities,small scale on the plane and multistage superposition on the vertical direction.The distribution of turbidite sandbody is mainly controlled by paleo-topography,fault,lacutrine level and sediments supplies.Two seemingly interconnected sandbodies based on well logging are not actually connected in the field development.Therefore,geology and development data should be combined to research the architecture characteristics.According to the connection circumstances and development feature of turbidite sandbody,the connection relationship of turbitide channel are classified into three types: main body connection of turbidite channel(incised superposition type),branch disconnection of turbidite channel,main body-edge connection of turbidite channel(slight incised superposition-contact type).The match relation between single channel architecture characteristics and well pattern is the main influence factor of remaining oil.During the late period,complete injection-production well pattern,make oil wells and water wells located in the direction of channel stretch,meanwhile considering the interconnection relation between sandbodies.And in this way the recovery ratio can be enhanced.