Rearch On Physical Properties Of Chang 6 Reservoir In Q11 Well Area Of Ordos Basin

This thesis takes chang 6 reservoir in Q11 well area of Ordos basin as the research object.In order to solve the problems such as the lack of accurate interpretation of physical properties and the lack of comprehensive understanding of physical properties in the research area,make a profound research for reservoir physical properties.Comprehensive the theoretical knowledge of sedimentary petrology,reservoir geology,petroleum geology and well logging,and make full use of the core data,well logging data,various analytical and laboratory data and production dynamic data to divide and contrast the Chang 6 formation in the research area.Meanwhile,research the structural characteristics,sedimentary characteristics and reservoir characteristics,and then research the physical characteristics,setting up physical property interpretation model based on physical property distribution characteristics of reservoir from the physical distribution characteristics of the reservoir,based on the relationship between acoustic time difference and porosity,the logging interpretation model of reservoir porosity was established by using one-dimensional regression,establishment of permeability logging interpretation model by using multi-parameter regression method,establishment of water saturation logging interpretation model with logging data,combined with the above research,the plane distribution characteristics of reservoir physical properties are discussed,and the main control factors of reservoir physical properties are researched.The Chang 6 reservoir in the research area can be divided into four layers: Chang 6~1,Chang 6~2,Chang 6~3 and Chang 6~4,the structure is a monoclinal structure with high east and low west,developed delta front subfacies with three microfacies: subaqueous distributary channel,subaqueous distributary channel flank and distributary bay;The lithology is mainly medium sandy fine-grained feldspathic sandstone,the diagenesis is mainly compaction and pressure dissolution,cementation and filling,dissolution and chlorite clay film inhibition,etc.,which is in middle diagenesis stage of A period.The pore types are mainly intergranular dissolution pore,intragranular dissolution pore and residual intergranular pore,some of which are mold pore,mainly developed class ?_b~? reservoir.The reservoir physical properties in the research area are poor as a whole.The porosity logging interpretation model and the permeability logging interpretation model can meet the requirements of interpretation accuracy.Through the established water saturation logging interpretation model,various geotechnical and electrical parameters are determined.Combined with the plane isoline map of the porosity and permeability,it can be concluded that the overall physical property deviation of Chang 6 section in the research area.There are longitudinal differences,most of which are ultra-low porosity and low permeability areas,but the physical property characteristics gradually improve from the bottom to the top.The main controlling factors of physical properties are sedimentation and diagenesis.In the process of sedimentation,rock clastic particles,maturity of rock particle structure and sedimentary facies belt mainly affect reservoir physical properties;in the process of diagenesis,mechanical compaction,carbonate cementation,dissolution and inhibition of chlorite clay film mainly affect reservoir physical properties.