The Reservoir Geological Characteristic Of Chang 6 And Chang 7 Oil-bearing Layers And Waterflood Development Plan In Block D-G

D-G area is located in the south of Ganquan County,the geotectonic location is the eastern part of the northern shanbei slope.In recent years,the oil region has become an important block to extend the oil development,and the main oil-producing layer is low permeability reservoir,so it is very important to develop the water injection.In order to propose a reasonable and efficient waterflood development plan,The geological characteristics of oil reservoirs must be fully understood.So it is necessary to study the fine stratigraphic contrast of the study area,analyze the sedimentary facies analysis and reservoir characteristics,and then master the oil and gas distribution rules of oil reservoirs.The paper focuses on Chang6,Chang7 reservoir in area.According to a study in well logging,core data to determine the sedimentary characteristics,reservoir characteristics,fluid properties,pressure system,the types of reservoir,a comprehensive grasp of reservoir geological characteristics.Then,according to the basic theory of reservoir development,reservoir engineering method and reservoir numerical simulation technology,This paper demonstrates the key problems of oilfield development principle,development mode,development layer system,well network system,single well capacity,daily injection capacity and stratum pressure maintenance level.Finally,a reasonable deployment plan is put forward for the waterflood development in the research area.Through research and analysis,the following understanding is obtained:The Chang6,Chang7 oil layers are mainly delta front subfacies,The rock type of reservoir is mainly feldspar sandstone,which is a set of ultra-low porosity and ultra-low permeability reservoir.which are the low permeability reservoirs.Found in a test for Chang6,Chang7 reservoir medium weak-weak water sensitivity,weak velocity sensitive-no velocity sensitivity of reservoir.thus,the study area is suitable for using water injection development.Comprehensive core observation,testing and fracturing interference analysis,the district 7 reservoir fracture direction for NE80°.Through argumentation,parametric calculation and research have concluded that the diamond shape is used to adopt the rhomboid and the well spacing is 450 x 140m.In the study area,water injection pressure should not exceed 25.0MPa,the reasonable flow pressure is 2.3 MPa,and the production pressure difference is 4.5 MPa.The maximum injection intensity is 1.4m~3/d.m.