Research On The Low-permeability Reservior Geological Characteristic And Remaining Oil Distribution In The Member Of Es3 In Yi118, Bonan Oilfield

The reservoir production of the member of ES3 in Yi118, Bonan Oilfield, which now have been at the stage of high water-cut, is declining heavily which was caused by the issues of rapid rising rate of water-cut, serious flooding, lower producing energy, scattered distribution of remaining oil. To achieve the effect of keep declining oil and control rising water-cut, it is necessity to carry out research on the the reservior geological characteristic and remaining oil.Block Yi118 low-permeability oil reservoir in Bonan Oilfield was studied as the research target. By the comprehensive co-utilization of different kinds of information such as geology, logging,producing test, history production performance.Yi118 block was mainly studied from the aspects of reservoir characteristics,include structural feature,stratum conditions,microtectonics characteristics,interbedded stratum,formation fluid,and reserves was recounted,and it gives an important basis to distribution and adjustment of the remaining oil. Applied reservoir engineering methods, aimed at the low levels of water flooding control, more wells stopped injection and production, imperfect well network and other probleums at the development, points in development unit and develop sub-strata of sand on the meaning of the member of Es3 block Yi118 of the flow characteristics of reservoir, water utilization, forecast recoverable reserves, and development effects for a systematic research and evaluation. Explained the low permeability reservoir water flooding characteristics and factors of production.Comprehensively analyzing reservoir sedimentary microfacies, structure, interlayer distribution, dynamic production situation, the remaining oil have been evaluated quantitatively. Obtained Yi118 remaining oil mainly controlled by sedimentary facies, mainly distributed in the facies transition area, the vertical distribution in the main facies of the upper part. With the foundation of the distribution of remaining oil, it points out the existing problem in the production, draw up the relevant countermeasure, schemes, development programs. The study raises the recovery ratio, also can provide a reference for the same type of oilfield. propose Yi118 remaining oil in low-permeability reservoirs in the direction and measures, Research on the Yi118 Bonan oilfield is of great significance to enhance oil recovery.