| In recent years,a series of complex production problems have been continuously demonstrated,with the progress of exploration and development work in the study area.Among them,there are many oil-bearing strata,poor correspondence between injection and production,low water absorption capacity of the injection wells in the block,slow energy shortage in the supplementary formation,and passive production.The sustainable development of science has occupied an important position in the production of oil fields in recent years.Therefore,this paper analyzes the existing data in the study area(well position coordinate elevation data,perforation data,seismic data,electronic logging curve,logging data,production data),and uses seismic data to control the sparse area of the well pattern.Drawing geological foundation maps;borrowing some experimental techniques(SEM,mercury intrusion,particle size analysis,X-ray diffraction),reservoir characteristics(stratigraphy,sedimentary facies,structure,porosity,permeability,sensitivity,non-uniformity)Qualitative,four-sex relationship)and reservoir characteristics(temperature and pressure systems,formation water properties,crude oil properties)systematic research.On this basis,through the analysis of production dynamic data(water injection well profile data,injection well production data,oil test summary data,pressure test data,effective water injection development well network data)in the study area,the existing water injection development in the study area is given.Evaluation.Finally,based on the research results(reservoir characteristics,reservoir characteristics,water injection development effect evaluation),the existing development schemes are analyzed(the water injection schedule is delayed,the formation deficit is serious,the flat formation pressure distribution is uneven,and the production well is effective).Slowly)Identify the main causes of problems and contradictions.Propose new well network deployment and fracturing,replenishing holes and measures to complete the adjustment of reservoir development plan.Through research,the following points are recognized:1.The structure of the study area is characterized by a western slope and a single slope,forming a plurality of nose-like ridges with a gentle structure,dense lithology in the upward tilt direction,forming a good trap,and combining the production data analysis of the work area to judge the hydrocarbon migration and accumulation.The favorable area is the structural uplift area,which provides a theoretical basis for the deployment of the new well.2.The length of the study area is 4+5 and the length 6 is the delta front subfacies deposit.The reservoir rock type is mainly lithic feldspar sandstone.According to the distribution characteristics of the sedimentary facies sand body and the longitudinal distribution characteristics of the sand body,the analysis is carried out.Different enrichment rules of different 4+5 and long 6 different layers of oil and gas,as well as different sand body connectivity characteristics,provide a basis for further adjustment of perforation and fracturing horizon.3.The pore structure of the study area is complex,mainly developing intergranular dissolved pores,and the content of cement in the slightly soluble pores is more;the mineral content affects the porosity and permeability of the reservoir,resulting in poor physical properties;due to sedimentary facies and diagenesis,Reservoir heterogeneity is obvious,and the variation of internal permeability of single sand body is more complicated.It is necessary to adopt corresponding fracturing and acidizing measures in later development and adjustment.4.The reservoirs in the study area are weakly sensitive,moderately weak,sensitive,weakly alkaline,weakly salt sensitive,moderately strong acid sensitive,weakly hydrophilic and irreducible water saturation of 46.8%,and the effective permeability of the bound water and oil phase is 1.013×10.-3?m2;oil-water relative permeability is 0.116;according to the existing water injection development analysis,the compatibility of injected water and reservoir is good,which provides powerful conditions for further water injection development.5.The crude oil in the study area is better,the density and saturation pressure are lower,and the freezing point is higher.It is a well-sealed reservoir with a buried depth of1500~1700m and the original average formation temperature of 2.73°C/100 m.The low viscosity of crude oil provides conditions to ensure better fluidity of the crude oil.6.Injecting water in the local injection well group in the study area is effective and slowing down,and the effect of stable production in two-way effective oil well is obvious.Through the analysis of the effect of the injection well group,combined with the longitudinal distribution characteristics of the sedimentary sand body,the sand body connection and the pinch-out are matched with the injection-production.Sexual relationships provide a viable basis for new injection well deployment locations. |
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