Micro-pore Structure Of The East16Blocks Of Yushulin And Remaining Oil Distribution

In this paper, With the data of well logs, core data, mercury intrusion curve, cast thinsection, scanning electron microscope and thin section,The microscopic pore structurecharacteristics, classification, logging and identification methods and their relationship withthe sedimentary microfacies, digenesis are studied combined with the reservoir characteristicsof Yushulin East Block16macro and micro characteristics. On this basis, the microscopicresidual oil types are divided according to the mode of occurrence of residual oil and thedistribution with the sheet on the fluorescence digital imaging. the study identifies therelationship of microscopic remaining oil distribution and sedimentary microfacies,diagenesis, and different washing stages. Then determine the microscopic remaining oildistribution law.Through research, the efficient space of East16is consisted by porosity and naturalmicro-cracks; clay mineral content is usually less than8%, a significant portion is caused bythe mud particles; microscopic pore structure of reservoir can be divided into generally lowpermeability reservoirs, low permeability reservoirs and low permeability reservoirs in threecategories. Class Ⅰ pore structure are mainly distributed in the core and the lower part of thethick layer of river sand, the other location the type of pore structure variation. Macroscopicresidual oil types can be divided into well network unable to control type injection andimperfect type, one-way by the acting, the type of interlayer interference, six kinds of verticalcracks in the direction of type and seepage resistance. Microscopic residual oil from theexisting state can be divided into the free state, bound states, bound states of three kinds ofmodes of occurrence of10types. The remaining oil can be divided into the mechanism of thephenomenon of rock clay, fingering phenomenon of residual oil, crude heterogeneity ofresidual oil, closure of the remaining oil compaction, particle size heterogeneity of theremaining oil. Different washing stages of the remaining oil type has a basic regularity ofdistribution characteristics, free state, the remaining oil gradually reduce with increasingwashing extent, movable, immovable bound states of the remaining oil gradually increased.Further understand is achieved according to the achievement, the results can guideimproving further the development of programs to provide a reliable technical basis for thearea increase reserves and production and rational development.