高精度碳氧比测井在泌阳凹陷的应用

Application of High Precision Carbon-oxygen Spectral Logging in Biyang Sag

为满足河南油田泌阳凹陷老区特高含水期非均质油层剩余油挖潜的需要,采用国产高精度碳氧比测井仪,其双源距设计减小了井眼和水泥环等因素的影响。通过对其响应特征分析,开展了影响因素校正,应用其测井参数建立了地层参数解释模型。该仪器采集的全硅计数率能较好地反映地层岩性,可用于地层对比和泥质含量计算;俘获与非弹计数比反映地层孔隙性,可用于孔隙度计算;采用碳氧比与孔隙度交会法、碳氧比和硅钙比幅度差与含油饱和度交会法、可计算储层含油饱和度。根据17口井的投产结果,建立了区域储层评价的定量标准,满足了储层饱和度评价的需要。

In order to meet the residual oil development needs of high water-cut stage and non- homogeneous reservoir in Biyang sag of Henan oilfield, we apply domestic high precision carbon- oxygen spectral logging tool which dual spacing designs reduces the influence of wellbore and cement ring and other factors. Through the analysis of response characteristics, we carry out the correction of the influence factors and establish interpretation model by logging parameters. All silicon count rate can finely reflect the formation lithology to contrast layer and calculate its clay content; Capture and inelastic count rate can reflect the formation porosity to calculate its porosity; We calculate reservoir oil saturation by C/O and porosity crossplot, the difference of C/O and Si/Ca and oil saturation crossplot. According 17 wells production result, we established the quantitative standard of regional reservoir evaluation to meet the requirement of reservoir saturation evaluation.