The Logging Evaluation Of C6Reservoir In YK Oil District

Ordos basin is full of oil and gas basin,in northwest of China. it is currently Chineselargest base of low permeability oil and gas resources, its reservoir with poor reservoirproperty, strong heterogeneity, complex reservoir forming factors, the characteristics ofreservoir distribution is controlled by many factors.YK oil region is located in the basin of ShanBei slope of the Middle East, the Chang6reservoir characteristics is similar with the Ordos basin’s characteristics. Now the YK oilregion is in the middle phase of development, each region is different of exploition. Chang6reservoir is major and strong reservoir heterogeneity. many problems encountered in theactual mining development process, such as local flooding、the result of mining oil testing isbad,.so the second evaluation of the reservoir become the top priority.In this paper, on the basis of predecessors’ study of ordos basin, using the collected morethan400Wells of geological data, drilling data, analysis of test data, test data, core andlogging data from the lithology and pore structure types, sedimentary microfacies, therelationship between the "four character", and heterogeneity are studied. on the basis of theabove research, porosity, permeation, expulsion pressure and median pressure, maximum,median radius of pore throat radius and average combination classification, sorting coefficientis selected as classsify parameter in gap four evaluation level of C6reservoir evaluation.Accomplishing the study of Stratigraphic correlation and classification of YK oilregion, Chang6subgroups is divided into four groups, respectively: Chang61, Chang62,Chang63, Chang64. In the study of lithology and pore structure research, this area reservoirlithology is mainly feldspar sandstone, the dissolution pores and residual intergranular pore ismain pore in the Chang6reservoir.YK oil region of sedimentary facies of delta frontmicrofacies, delta distributary channel, channel lateral margin and distributary baymicrofacies. in the study of four character of Chang6reservoir, the physical property ofreservoir evident on the well logging curve is good, porosity and permeability interpretationtemplate. on the basis of "four character" study, porosity and acoustic time return, template of porosity can be established, by cross-plot porosity and permeability, permeabilityinterpretation template, for more than400Wells for porosity and permeability interpretation.Through the classification evaluation, the study district Chang6poor reservoir belongs tomedium reservoir.