Study On Fine Tectonic Interpretation And Reservoir Prediction In Tongsan Section Of Sorenol Oilfield

With the continuous progress of exploration process,the present geological reserves can no longer meet our needs.However,the subsurface structure of the tongsan section of the Sorenol field is complex and variable,and it is difficult to recognize the multi-stage overlap of sediments,and the sand bodies are mostly highly resistant,which makes it impossible to efficiently identify favorable reservoirs.Therefore,in order to further identify the subsurface structure and reserve distribution,a combined well-seismic fine tectonic interpretation is used to analyze the tectonic characteristics of the whole area,and at the same time,a seismic inversion is performed based on the reconstruction of the high-resistance characteristic curve of the tongsan section of the Surenol field,so as to make accurate prediction of favorable reservoirs.Combining the logging,recording and seismic data of the study area,the stratigraphic framework of the whole area was established with the guidance of stratigraphic stratigraphy.Based on the results of stratigraphic calibration,stratigraphic and fault interpretation was carried out,and the tectonic characteristics of the Tong San section were studied.The results showed that the study area has a tectonic pattern of "two rises sandwiched by one depression" in the north-south direction,and the stratigraphy gradually rises from west to east in the eastwest direction,with a local uplift in the middle.The lowest,the fault direction is mainly northeast and near north-south,and a series of traps of different scales are developed along the main fault zone.In the sedimentary phase mapping,it is determined that the area is a fan delta front sedimentary environment based on logs,logs,cores and seismic attributes,and the source direction is mainly northwest.On the whole,the development scale of river channels in the whole area is large,and only a few inter-channel channels are developed.The material source is mainly in the northwest direction,and small-scale channels are developed in the east and north.According to the pre-processing of logging curves in the study area,curve sensitivity analysis,inversion method preference to complete the reservoir prediction study,based on the reservoir prediction of the lithology of the target section and the oil content analysis of the logging,effective oil sandstone for sensitivity analysis,select the curve with good response characteristics for fusion reconstruction,using the reconstructed curve as a constraint to complete the study of favorable reservoir prediction,the effective sandstone as a whole only the northern Surenor The effective sandstone as a whole is only developed on a small scale in the rising disk of the northern Surenor Fracture Zone and the local uplift in the middle,and the sand body as a whole is developed in a north-south elliptical direction,and the thickness of each sandstone layer is mainly between 10m-15 m,and the maximum can reach 20 m.On the basis of comprehensive tectonic,fracture,sedimentary micro-phase and reservoir characteristics,based on the law of oil and water distribution and typical areas,the research results of regional geological conditions,tectonics,trap,oil and water distribution and reservoir development are integrated to determine five regions with three types of favorable areas:favorable areas for reservoir area encryption,favorable areas for reservoir area outreach potential,and favorable areas for blank area exploration.