Research on identification technology of Water flooded zone based on drilling mud optimization design
For the deep strata of Nanpu Sag,the lithology is complex,the physical properties and oilness changes greatly and the logging characteristics of oil and gas reservoir are very complex,it's difficult to identify.the development of fresh water injection aggravates the complexity of reservoir water property,the electrical characteristics are more complex,qualitative identification technology of water flooded layer in conventional logging which based on resistivity and porosity has great limitations.Positive amplitude difference of spontaneous potential logging can indicate the change of reservoir water property effectively,by controlling the salinity of mud,make the spontaneous potential showed a small or micro positive difference at oil layer and a large positive difference at water flooded layer,to indicate the change of reservoir water property,outburst water flooded layer and identify subtle reservoirs.Field application shows that through reasonable drilling mud design,using positive amplitude difference of spontaneous potential to indicate reservoir water property change,can identify water flooded layer and subtle reservoirs,and good results have been achieved.
water flooded layerspontaneous potentialdrilling mud designNanpu Sag
NETL
NSTL
万方数据
