基于成因机制的鄂尔多斯盆地白266井区长2段低阻油层多参数流体识别方法OA

In the Chang 2 Member of Block Bai 266 in the Huaqing Area of Ordos Basin,the extensive development of low-resistivity oil zones has resulted in high difficulty and low accuracy in fluid identification.To address this issue,based on analytical techniques including scanning electron microscopy(SEM)and X-ray diffraction(XRD),combined with data from well testing,core analysis,and formation water analysis,this study conducts an in-depth analysis of the genetic mechanisms of low-resistivity oil zones and establishes a multi-parameter comprehensive identification methodology.First,a basic classification of reservoir fluids was performed using an acoustic time difference versus resistivity cross-plot.Next,an apparent resistivity increase ratio chart was applied to eliminate interference from lithology and salinity.Then,an invasion factor was used to quantify the radial resistivity difference between oil and water layers.Finally,the hydrocarbon-bearing potential of the reservoir was verified using the acoustic time difference and resistivity curve overlay method.Well testing validation shows that this method achieves a fluid identification accuracy of 92.9％,effectively addressing the challenge of identifying low-resistivity oil zones in the study area.It provides a reliable technical reference for reservoir fluid identification in this region and other areas with similar geological conditions.