Comprehensive Evaluation Method for Complex Fluid in Low Porosity and Low Permeability Reservoirs
Low porosity and low permeability reservoirs are developed in the eastern third section of the target layer in the Bohai LD oilfield,with complex pore structures.The fluid pressure difference between the reservoir and the ground is small,and the dissolved gas oil ratio is high,resulting in small differences in the logging response characteristics of oil,gas,and water layers.Comparing and analyzing the logging and logging data of oil,gas,and water layers confirmed by testing,pressure measurement,and sampling,it is believed that the intersection amplitude of volume compression coefficient and Poisson's ratio,apparent formation water resistance,gas logging anomaly multiple,and pyrolysis gas chromatography are more sensitive to the response of fluid properties.Based on the four types of parameters mentioned above,a fluid discrimination model for oil,gas,and water layers is established using support vector machine algorithm,with 70 samples of oil,gas,and water layers confirmed through testing,pressure measurement,and sampling as data samples,including 51 samples as training samples and 19 samples as testing samples.This method has achieved good results in fluid identification in LD oilfield,with a compliance rate of 89.4%for fluid property identification,laying a foundation for reserve evaluation in the oilfield.This method has reference significance for fluid property identification of similar reservoirs.
low porosity and low permeabilitycomplex fluidlogging and mud loggingfluid identification parametersupport vector machine
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