Study On Logging Interpretation Method Of Tight Oil In Southern Songliao Basin

R area in the southern Songliao Basin spring four section for tight oil reservoir of typical,hand adhering to the basic characteristics of the reservoirs of the Songliao Basin,which is of low porosity and low permeability,reservoir thickness is large,vertical and horizontal heterogeneity(interlayer is more,lithology changes fast)the universal characteristics,on the other hand with oil moisture difference,formation water changes fast,oil changes of resistivity,vertical low resistivity and high resistivity layers coexist and characteristics of fluid identification difficult,and the lithology of reservoir fine particles,complex pore structure,reservoir containing the CO2 led to the formation water salinity changes and other issues,to identify oil and water rate is only 63.8%,reserves parameter model accuracy is not high,bring difficulties to the oil-water layer logging interpretation and post production,need to use logging data to improve the coincidence rate of reservoir fluid identification,distribution characteristics and understanding of tight oil,improve the logging interpretation accuracy,guiding production.Log interpretation of tight oil reservoir in R area of southern Songliao Basin,first of all,starting from the characteristics of pore structure,pore types and pore throat configuration,structure analysis,regional characteristics of pore throat,the parameter calculation model to establish the pore throat radius,median grain size,according to the characteristics of the macro and micro pore throat features,to evaluate the reservoir quality grade index,classification and evaluation of reservoir;utilizing core experimental data and logging curve data,summarize the relationship between the characteristics of the logging response with four R area of tight oil reservoir lithology is different,the different salinity of formation water conditions,study the different lithology,physical property,oil-bearing property effects on log in response,defined the main oil-bearing lithology and oil-bearing petrophysical lower,on CO2,the salinity of formation water distribution and its effect on the response characteristics of logging,and the impact of tight oil reservoir conditions of mud invasion of R area is simulated by using optimization method,for tight oil reservoir fluid identification and establish fine reserve parameter model lays a basis;according to the R area of tight oil reservoir characteristics and logging response characteristics,study on the fluid identification method suitable to this block,with the region,lithology,The oil-water layer establishes different reservoir method of formation water salinity criteria,thus improved the precision of logging interpretation;according to the tight oil reservoir geological characteristics and core analysis data,using different mathematical methods to establish suitable porosity,permeability model for spring four sections of tight oil reservoir of the work area,the analysis of micro pore structure,shale content,the establishment of water saturation model and parameters suitable for tight oil reservoir in R region;application of flooding into the theory and method of reservoir,study the dense R regions the oil displacement capacity and saturation(resistivity)relationship,analyses the relationship between tight reservoirs in hydrocarbon and buoyancy forces,capillary force,and Study on the causes of tight oil reservoir water more in this area,summarizes the different reservoir fluid distribution.Formed a set of suitable methods of well logging interpretation of southern Songliao Basin R area of tight oil reservoir,thus improved the precision of logging interpretation,theory method enriches the domestic logging tight oil reservoir interpretation.