Logging Comprehensive Evaluation Of Carbonate Reservoirs In Xinken4 Wellblock Of Halahatang Oilfield

The carbonate reservoirs of the Ordovician Yijianfang Formation in the Halahatang Oil Field have the characteristics of low porosity,low permeability and high heterogeneity,making it difficult to distinguish between effective reservoir identification and fluid property relationships.The evaluation is of great significance to the exploration and development of fracture-cavity carbonate rocks.In this paper,the carbonate reservoir of the Xinken 4 well block in Halahatang Oilfield is taken as an example,comprehensive analysis of the core,thin section and other analytical data combined with well log data and trial oil test data were used for recognition and evaluation of reservoir effectiveness and fluid properties.Firstly,the pore types of the target strata are recognized through cores,thin section,and analytical and analytical data systems.According to different combinations of reservoir space,the reservoirs are divided into fracture type,pore type,fracture-hole type,and cave-type reservoirs,and are routinely measured.On the basis of conventional wells,combined with image logs to further divide,sum up the log response characteristics of various types of reservoirs;then,reservoir porosity,permeability and saturation parameters are calculated based on reservoir types,and fracture development is evaluated in combination with image logs.The porosity spectrum of reservoirs is calculated to further identify effective fractures and effective pores.Finally,the physical properties of effective reservoirs are determined using cross-plot and analogy methods.Finally,the conventional reservoirs are used in combination with trial oil test data to divide reservoirs.The porosity-resistivity intersection plate for various types of reservoirs is built,and semi-quantitatively identifies reservoir oil-water relationships,calculates micro-resistivity imaging logging water resistivity spectrum,qualitatively identifies oil and water layers,and further calculates mean and variance of apparent water resistivity,and produces cross-cuts.The map quantitatively identifies the oil and water layers;establishes electrical standards in conjunction with the physical properties of effective reservoirs and completes the synthesis of carbonate reservoirs evaluation.