Recognition Of Low-resistance Oil Layers In LL Oilfield And Research On Remaining Oil Distribution

The low resistivity reservoir(LRR)are well developed in many oil and gas field of eastern and western China,so the prospect of exploration is promising.The LRR is a kind of complex and unconventional reservoir,the resistivity characters of which have no obvious corresponding relations with conventional one.The phenomenon is caused by many factors alone or comprehensively,such as lithology,petrophysicals,properties of fluids,mud invasion,structure amplitude,wettability of rock and so on.This paper set the lower cretaceous and hutubihe group of LuLiang oil field(k1h24 reservoir)as an example.By analyzing materials of well logging,mud logging,rock core and oil test,the main distributing areas of LRR are known to us,as well as the forming reasons of this high porosity,middle and high permeability,thin oil layer,lenticula and lithological reservoir with side and bottom water.The well logging recognition and value methods of LRR were also discussed.At the same time,the remaining oil distributing law was deeply studied by means of reservoir data、large numbers of logging materials of new penetrated layer well in recent years and numerical simulation technology,through which we have got deep insight into the distribution of remaining oil.On the base of study on reasonable injection-production ratio and quantity of liquid production,three schemes of development adjustment(F1、F2、F3)have been designed.By comparison the cumulative oil production,cumulative water production,water cut,recovery efficienty among the four schemes(i.e the based scheme(FO)and the other three adjustment schemes),the F3 schemes is considered to be the best one,with the highest cumulative oil production of 53.43×104ton,and the expected oil recovery degree of 12.39 percent,which is more than 2.92 percent than scheme F0.