基于Rt-Φ的Pkt图确定油水层及有效厚度下限标准

储层合流体性质识别与有效厚度下限标准确定是测井精细解释的重要内容。采用传统的电阻率-孔隙度交会图(例如Hingle交会图)仅能判断储层合流体性质,而在实际解释工作中,常要求用交会图既能快速直观地显示地层的含油性,又能确定有效储油层的孔隙度、电阻率和含油饱和度的下限标准,以便统计油层的有效厚度。而Pickett电阻率-孔隙度交会图具有这两种功能。本文结合测井逐点分层解释得来的电阻率、孔隙度和饱和度参数,利用改进的Pickett电阻率-孔隙度交会图法及其自动处理程序,建立了工区N_2~1油藏油水层识别的电阻率-孔隙度交会图版。研究表明,此图版对工区油水层的识别具有较高的分辨率、且易于准确确定油层有效厚度的参数下限,直观快捷,值得推广应用。

Determination of Lower Limit Standard For Oil-Water Layer and Effective Thicknessbased on Kt-

Identification of reservoir fluid property and determination of the lower limit standard of effective thickness are important in fine interpreta- tion.The conventional resistivity-porosity cross-plot(e.g.Hingle cross-plot)can be only used to judge reservoir fluid property.In practical interpretation,the cross-plot is required not only to display oiliness of the formation quickly and intuitively,but also to determine the effec- tive porosity,resistivity of the oil-bearing zone and lower limit standard of oil saturation so as to calculate the effective thickness of the reservoir.Pickett resistivity-porosity cross-plot has both of the functions.The resistivity-porosity cross-plot for identification of oil and water layers in N21 reservoir of this area is established by using the improved Pickett resistivity-poresity cross-plot and automatic processing program with combination of resistivity,porosity and saturation parameters derived from point-to-point hierarchy interpretation.The re- search shows that this plate has high resolution and is easy to determine the lower limit of effective reservoir thickness.It is worth to popu- larize.