High Resolution Analysis For Log Curve And Interpretation Of Thin Bed

It has been more than 40 years since Daqing oil field Was found in 1960s,from the first oil well Was exploited to the steady production of 50 millionton yearly,and now,the oil production has been in a decreasing period.To obtaina steady and increased production of oil in new century is a great task,whichall the technicians ofDaqing oil field has to face.The Daqing oil field hasalready been in a period of high hydrous and the global water content has beengreater than 98 percent.In early years,the exploitation of Daqing 0il fieldWas mainly on thick beds.However, now the thin beds between 5 and 60 cm hasalready more and more attention,for its rich content and great production. Recently,several well logging company in the USA,has done well in thisfield,Schiumberge,Atlas,and HAL have developed a set of apparatus withhighly resolution to adapt to the thin beds.And they also analyzed the effecton thin bed from sample rate and well-log speed.Furthermore,they raised thevertical resolution of conventional well-log curve by means of mathematicalmethod,and using combined well-log curves of high resolution and moderateresolution and low resolution to evaluate thin beds. In China , Daqing field and Nanyang field has obtained high resolutionwell-log curve through well-log apparatus of high resolution combined withmathematics methods.They use high resolution well-log curves to calculate thecoefficients of this beds and using the regression technique to regress someuseful and valuable experience formula. To prospect and exploit thin-beds,above all,we should solve the thin bedsrecognition and evaluation problems.This paper used mathematical methods tOraise the vertical resolution of conventional well-log curves and developed themodel to suit for the thin beds property.Firstly,the paper has analyzed thegeology distribution,the Hthologic,physical property and oil content property ofthin beds in Daqing oil-field.Then,seven kinds of methods(resolution matchingmethod,least square convolution methods,maximum entropy deconvolution method,spectral-filter,a-factor method,the compounding high-resolution and conductancewell-log curve,a simple method to raise the vertical resolution of lateral log)havebeen studied.At last,the paper proposed a momfied idea for resolution matchingmethod.The result of the experiment indicated that the resolution matching methoddid better than other six methods.And the comparison of the data showed thehigh resolution well-log curve dealt by high resolution methods.Obtailled themicroelectrode vertical resolution,and the layering capability was greatly raised,it could lay out the thin beds of 0.3m,which is even better approach the real value.Contrast the result figure before and after resolution dealing,it was found thatthe Oil content saturation explained by high resolution curve was better approachedto the core,which indicated that the selected method was reasonable and valid.From the dualistic lithologic thin beds'explaining figure,we could found that theanalyze method of dualistic lithologic,was feasible,especially applicable to thinbeds,and the oil content saturation computed from the conductance compoundedby dualistic atholo#c analysis was approximate to that of core analysis.So, theconductance compounded by dualistic litholo#c analysis was dependable essentially.