Comprehensive Determination of Oil-Water Boundary in Eastern Transitional Zone of Daqing SN Oilfield Pk(V|U,I)Pk(V|I)Pk(U|I)
In order to determine the oil-water contact in the eastern transitional zone of the Daqing SN oilfield,based on the drilling,log-ging,and seismic data,together with the core oil occurrence analysis and the reinterpretation of oil/water layers in existing wells,a com-prehensive method for determining the oil-water boundary in the extension zone of structural reservoirs was discussed by using the tech-niques such as hydrocarbon detection through post-stack seismic attributes based on dual-phase medium theories and fluid identifica-tion based on pre-stack seismic waveform indication inversion.The oil-water interface in the study area exhibits the following character-istics:(1)oil patch or higher level occurs in cores;(2)oil layers or oil-water layers are extrapolated on the basis of logging interpretation;(3)in post-stack attributes,the energy ratio of low frequency to high frequency is greater than 0.85;and(4)the predicted water saturation from pre-stack inversion is less than 75%.Therefore,following the principle of"depth of oil-water contact determined by well data,boundaries of oil and water distribution determined by seismic data,and validation by well performance",and through comprehensive analysis from point to line,plane,and then space,the final position of the oil-water interface was determined.The research results effec-tively guide the extention deployment and evaluation in the study area,and are referential for delineating the oil-water boundaries in sim-ilar structural reservoirs.
万方数据
维普
