Study Of Fineness Reservoir Discription And Prediction Of Remaining Oil Distribution In K1s1 Of Hongnan 2 Oilfield

Along with the emergence of the maturing field with high water content and the low-recovery situation, the difficulty of tapping the potential of remaining oil is increasing. The fine reservoir description has become a key technology for oilfield development, and the core is to make full use of various static and dynamic information which can study the three-dimensional distribution of interwell reservoir parameters, and combine with rule of displacement of oil by water to establish the distribution model of remaining oil, which can provide accurate geological basis for the next adjustment of tapping the potential and deep profile control and oil displacement.Cretaceous K1s1 reservoir which is in Hongnan 2 district of interest is a thick massive edge and bottom water sand reservoir. The main sediments is meandering river beach sediment sand the rock type is a brown fine sand, silt rock. The average porosity of reservoir is 28.2% and average permeability is 859.5×10^-3μm². Due to the long high-speed development, the liquid water content of oil field is rising rapidly, so the production is declining, the remaining reserves are difficult to tap. Through the application of partition, shut pressure cone, Commingled production of oil and water, separated production of oil and water, edge mining water and emission and other means, the results have little effect. what's more ,it brings great difficulties to the adjustment of development programs.According to the above production status, this paper oil with high-resolution sequence stratigraphy, reservoir sedimentology, logging hermeneutics, geological statistics, and so on as the theory basis, using the principle of metrical contrast layered, through the fine depict of reservoir skeleton, sandwich distribution reservoir skeleton net and on the basis of petrophysical parameters in the second explanation and random modeling simulation, coupled with the study formation fluid distribution and nature, combining oil-water movement rules and water flooded regularity study to predict the distribution of remaining oil. The results show that, physical properties are poor in the southern and western of K1s1 group, the majority are the silty sand and the fine sandstone, average porosity is 26.5²8% and average permeability is 660⁹50×10^-3μm², interface layers are widely distributed, water content increased rapidly and severe flooding, while physical properties and connectivity are good in the northern reservoir, the majority is fine sandstone, average porosity is 28³1% and average permeability is 900¹650×10^-3μm², sometimes there are some interface layers, which is point-like concentration distribution and well connected to each other, water content increased slowly, there is favorable block for the remaining oil.