歧口凹陷刘官庄低饱和度稠油油藏储层评价关键参数研究

Key parameters for reservoir evaluation of Liuguanzhuang low saturation heavy oil reservoir in Qikou Sag

刘官庄油田馆Ⅲ油组发育大面积稠油低饱和度油藏,油水层测井曲线特征对比度低、流体识别困难,传统的区域性岩电参数定量计算含油饱和度误差大。在油藏背景条件下,从稠油低饱和度油藏储层的特点入手,通过分析储层独特的测井响应特征,提出利用实测电阻率与构建水层电阻率的比值进行流体性质识别,有效消除岩性、物性、含水饱和度对电阻率的影响,最大限度地反映储层含油性质,实现对稠油油层有效评价;同时,依托该套稠油储层上部标准水层,利用pickett图版,确定不同类型稠油低饱和度油层岩电参数,提高了含油饱和度计算的精度。现场应用证实,测井评价结果与试油结果相吻合,有力支撑了该地区的油气勘探。

GuanⅢoil formation in Liuguanzhuang oilfield develops a large area of heavy oil and low saturation reservoirs.The contrast of oil and water layer logging curve characteristics is low,and fluid identification is difficult.The traditional quantitative calculation of regional rock electrical parameters has a large error in oil saturation.Under the reservoir background,starting from the characteristics of the low saturation reservoir of heavy oil,through the analysis of the unique logging response characteristics of the reservoir,it is proposed to identify the fluid properties by using the ratio of measured resistivity to the resistivity of the constructed water layer,effectively eliminate the impact of lithology,physical properties and water saturation on the resistivity,maximize the oil properties of the reservoir,and realize the effective evaluation of the heavy oil reservoir.At the same time,depending on the standard water layer in the upper part of the heavy oil reservoir and using the Pickett chart,the rock electrical parameters of different types of low saturation heavy oil reservoirs are determined,which improves the accuracy of oil saturation calculation.Field application proves that the logging evaluation results are consistent with the oil testing results,which strongly supports the oil and gas exploration in this area.