Research On Well Logging Evaluation Method Of Fuyu Tight Oil Reservoir In Daqing Putaohua Oilfield

The development of tight oil reservoir in Fuyu Oil Field in the north of Songliao Basin has a wide range of distribution and large resource potential,which is an important part of the sustainable production of 40 million tons in Daqing Oilfield,so tight oil evaluation is very necessary.In this study,the Fuyu oil field of Putaohua oilfield in Daqing is a low porosity and extra low permeability reservoir with poor reservoir conditions,strong heterogeneity and complex pore structure.In view of the above situation,using the core analysis data from the study area,taking analysis of the characteristics of the block carried out tight oil reservoir lithology,physical properties,mineral composition and other parameters of block core data and logging data based on the established organic carbon content,vitrinite reflectance,porosity,permeability,water saturation,mud matter content,brittle index logging evaluation model.NMR logging data and mercury data of reservoir pore structure study using conventional physical data,and on 12 wells of 67 test reservoir are analyzed,12 wells are calculated by using the comprehensive model of tight sandstone saturation saturation,drawing the 67 test oil saturation and porosity of the oil layer crossplot chart,and the coincidence rate is 88.1%,formed the tight reservoir classification evaluation method and standard.The influence of tight reservoir fluid identification analysis of main controlling factors,established the resistivity of different salinity conditions to optimize the sensitive parameters,correction formula,preparation of fluid identification plate,improve the interpretation accuracy of oil-water layer identification chart.The oil reservoir strength as the standard,so that the tight oil reservoir classification results,the application of "seven" parameters to build macro quality RQ1,micro pore structure and RQ2 quality engineering quality CQ three quality factors,at the same time,based on the analysis of SPSS statistical software,using Fisher discriminant analysis,established three kinds of reservoir identification expressions dessert ",established a three-dimensional tight oil reservoir" dessert "classification chart,formed a comprehensive evaluation of reservoir quality is the core of the" dessert "classification method.Research results to the application,the research results have been applied to the northern region of 42 tight oil exploration wells in well logging interpretation,reservoir porosity calculation of the average absolute error of 0.98% wells,oil-water layer interpretation coincidence rate is 95.7%,achieve better effect,wells interpretation coincidence rate increased as the "geological research,preferably dessert." providing technical support,especially in tight oil and straight wells "seven" evaluation results,has become the direct perforation position selection and an important basis for determining the fracturing section design.It can provide technical support for exploration and development of tight reservoir,and has obvious economic and social benefits.