Research On Logging Interpretation Model And Evaluation Methods For Dongying Formation Of Bohai L Oilfield

Since the 21st century,the Bohai Oilfield has been continuously invested in the development of mid-deep formations,and a large number of different types of lowresistivity oil layers have been discovered.However,the mid-deep formations are affected by the tan-lu fault zone,and most of the anticline reservoirs have developed fault blocks,The facies system is mainly delta,and the reservoir properties are complex and changeable,and the difficulty of logging identification and evaluation is greatly increased.The L oilfield in the Liao Dong Bay depression is a typical mid-deep oilfield.The reservoir has large longitudinal lithology changes,thin layers are developed,and the transverse rock physical properties are obviously different.The well logging response relationship is complicated.It is urgent to conduct an adaptability study on the target oilfield and form a set of technical ideas suitable for the study of low-resistivity oil layersIn this paper,based on the difficulties in the evaluation of low-resistivity oil layers in the mid-deep layers,based on the logging data,oil test data,and core test data of the Dongying Formation sandstone reservoir in the L oil field,the geological and sedimentary characteristics of the reservoir are integrated.There are three types of factors that affect reservoir resistivity,including thin sand-mud interbed,layer and formation water salinity and lithology changes.From this analysis,four types of low-resistivity oil layers are summarized,and the development position of each type of low-resistivity oil layer is clarified.With well logging data,a set of effective low-resistivity oil layer identification technology has been formed.The quantitative calculation model of reservoir parameters in this area was developed and established.The model was used to evaluate the physical properties of the oil test interval,and thus the reservoir classification and productivity classification standards were obtained.These methods have good applicability in the target block,and also provide effective guidance for the evaluation of low-resistivity oil layers in the Bohai Bay.