Comprehensive Logging Interpretation Of Complex Fluid In Putaohua Reservoir Of Daqingzijing Oilfield

Daqingzijing Oilfield is located in the central depression of the south of the Songliao Basin.The reservoir type of the Putaohua reservoir in the target stratum is complex,the hydrocarbon accumulation rules are unclear,and the accuracy of fluid logging interpretation is not high.Therefore,the deployment of the exploration system has not received enough attention.However,in recent years,the output of oil fields has been continuously reduced,and the grape oil layer has gradually received attention.Due to the complex fluid properties in the Putaohua oil layer,conventional well logging interpretation methods cannot identify and evaluate reservoir fluid properties well.Therefore,it is urgent to establish a well logging identification method suitable for the complex fluid properties in the study area.In this paper,starting from the core observation,the provenance of the Putaohua oil layer was analyzed,and determining the type of sedimentary facies in the Yao 1st section of the study area.The core phase was used to calibrate the well logging phase and the rock-electricity correspondence relationship was established.Comprehensively use coring data,test oil test data,and logging and logging data to study the “four-property” relationship of reservoirs and establish a quadrilateral reservoir map.On this basis,the physical properties of effective reservoirs were determined.At the same time,the electrical and physical properties of low-resistivity reservoirs and high-resistivity reservoirs were analyzed.Physical property and the electrical property identification standards of low-resistivity reservoirs and high-resistivity reservoirs were preliminarily established.From the formation mechanism of low-resistivity oil layers and high-resistivity water layers,the causes of low-resistivity oil layers and high water-blocking layers in the Putaohua oil layer were analyzed and summarized.Based on the cause of the main control of the low resistivity oil layer in Putaohua reservoir,the Indonesian equation was improved.By studying systematically the rock parameters,shale content,porosity and formation water resistivity in the study area,the best accuracy of logging interpretation in the study area was achieved.Through comprehensive research and analysis,the "four-character" relationship,the formation mechanisms of low-resistivity oil reservoirs and high-resistivity water layer in the Putaohua oil layer have been clarified.The logging identification methods for the causes of low-resistivity oil formations have been established.At the same time,the practicability of the method in the study area was demonstrated,and making technical reserves for thelong-term development of the oil field.