| With the deepening of exploration and development,Beizhong,Sudeerte and other oil fields have been successfully developed in Beier Sag of Hailar Basin,which proved the oil-bearing potential of Nantun Formation in practice.However,affected by structural conditions and complex geological conditions,the degree of research on the second member of the South Section of Xi2 District is relatively low.This thesis combines the theoretical foundations of structural geology,reservoir sedimentology,and reservoir-forming dynamics,and takes the oil layer of the second member of the South Member of Xi 2 in Beier Oilfield as an example,and conducts research on reservoir characteristics and sedimentary characteristics of the oil layer of the second member of the South.On this basis,a structural model of the target zone was established,and the design of horizontal well layout schemes and optimization of fracturing parameters were carried out.Combining the relationship of the "four characteristics" of the reservoir,the interpretation model for the sandstone of the second member of the South Member was established,the logging interpretation of the sandstone and effective thickness of the second member of the South member was completed,and the reconstruction curve was established for different reservoir characteristics,and the reservoir reverse of the second member of the South It also describes the four oil layer groups and eight main units of sand body prediction and effective thickness prediction.The main oil layers in the study area are relatively well-developed sandstones,which are distributed in all oil layers.Vertically,the thickest sandstone is the N2?3 oil layer,and the thickest sandstone is 42 meters.Combining core,mud logging,single-well facies,profile facies and attributes,inversion prediction and other data,13 small-layer sedimentary microfacies of the second member of the South Member have been drawn.The research results show that the overall sedimentary environment of the second member of the South Member is a fan delta-lacustrine sedimentary system.The sedimentary period of the second member of the South Member is dominated by southeast and south sources,followed by the eastern and northern sources.Combined with the results of digital simulation,it is predicted that as of April 2018,the cumulative oil production of the whole area is 32127.48m3,the fitted cumulative oil production is 31700.18m3,the error is 1.33%,the actual water cut is 51.3%,and the fitted water cut is 52.1%.,The error is 1.56%,and the fitting accuracy of the whole area is high,which can meet the follow-up requirements.Comprehensive geological research results,completed the well location design of 2 horizontal wells.A horizontal well was designed in the N2 IV oil layer to the south near the source.The horizontal well was drilled into two sets of sandstone,and the horizontal section of the horizontal well was 683 m in length.A stepped horizontal well is designed near the provenance in the N2 III oil layer,and the length of the horizontal section of the horizontal well is about 1040 m.Based on the above geological research results,in order to better complete the fracturing process in the favorable target area,combined with the results of geological modeling and reservoir numerical simulation,through optimizing the fracturing parameters,the optimal length of the fracture,the optimal fracture spacing and the optimal fracture are determined.Excellent diversion capacity.In this study,the geology and engineering experience of horizontal wells in Daqing Oilfield and Hailar Oilfield were used for reference,and the horizontal well fracturing parameter optimization design was realized by simulating the fracturing method of horizontal wells in low porosity and ultra-low permeability reservoirs in the two oil fields. |
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