The Study On Logging Evaluation And Geological Modeling Of Water Flooded Layer In Bentiu Massive Bottom Water Reservoir In Fula North Oilfield

Bentiu reservoir of Fula North oil filed is lump bottom water reservoir.After more than ten years of development with the natural energy,bottom water is coning,the oil-water interface continues to uplift,and lots of wells met water rapidly in the early development stage.The recovery ratio is obviously reduced,so it is urgent to do the comprehensive evaluation of water flooded layer logging,to study the remaining oil,and provide support for the stable production.By analysis of Bentiu reservoir water flooded geological characteristics,the water flooded layer logging response characteristics was systematically summed up: natural potential amplitude increasing natural gamma reducing,acoustic time increasing,deep resistivity declining obviously,and etc,the deep resistivity and natural potential amplitude,deep resistivity and acoustic time,and two kinds of water flooded layer identification chart for qualitative were mainly established..According to core data and logging data,the work of quantitative interpretation of water flooded layer was finished.Meanwhile a clay content interpretation model based on the natural gamma ray logging data was established.A porosity interpretation model based on core analysis porosity and logging density data,a permeability interpretation model based on core analysis permeability and logging density data,the resistivity of water flooded layer with water analysis data,a water saturation interpretation model based on Indonesia formula,a water saturation of irreducible water saturation interpretation model based on core analysis permeability and irreducible water saturation,a residual oil saturation interpretation model based on core analysis permeability and residual oil saturation were studied.A flooded level division model based on production rate of water was alalyzed,verified by actual data and got a good application results.The 115 water flooding wells in the research area of natural water flooding were found,The total of 483 layers of water flooded layer interpretation were finished,established the two-dimensional residual oil saturation in water flooded zone model,study tapping of remaining oil from the macro.