Core Experimental Evaluation of Clastic Reservoir Saturation and Water Displacement Effect: Triassic Development Zone in the 9th Block of Tahe Oilfield as an Example
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摘要: 利用核磁共振二维谱、在线测试技术，建立了扩散-弛豫二维谱技术分析岩心含油饱和度的方法；对不同井的不同层段岩心进行了不同驱替速度水驱油的核磁共振在线测试，通过对比不同时刻测试的核磁共振T2图谱的面积值和分布特征，计算不同孔隙区间油的采出程度，分析评价不同孔隙对整体采出程度的贡献率、水驱油效果以及剩余油状况。实验结果表明，TK150井油层段实验岩心水驱大、中孔隙对采出程度的贡献较大，弱水淹段实验岩心水驱大、中、小孔隙对采出程度的贡献较大。但大孔隙所占总孔隙比例小，所以采出程度相比油层段岩心较低。TK960井油层段实验岩心水驱大、中孔隙对采出程度的贡献较大，中水淹段实验岩心水驱中、小孔隙对采出程度的贡献较大，强水淹段实验岩心水驱大、中孔隙对采出程度的贡献较大。不同井的不同层段岩心水驱油后所有尺度的孔隙中都有剩余油分布。Abstract: Using NMR 2-D spectrum and online testing technology, Core oil saturation analysis by nuclear magnetic resonance diffusion-relaxation spectrum was established.On-line NMR tests of water displacement at different velocities in cores of different intervals of different Wells were carried out. By comparing the area values and distribution characteristics of NMR T2 spectrum tested at different times, the degree of oil recovery in different pore intervals was calculated. The contribution rate of different pores to recovery degree, water displacement effect and residual oil distribution in core were analyzed and evaluated. The large and medium pores in the experimental core of TK150 well reservoir section contribute greatly to the recovery degree, The large, medium and small pores in the experimental core of weak water section contribute greatly to the recovery degree. However, large pores account for a small proportion of total pores, so the recovery degree is lower than that of reservoir cores. The large and medium pores in the experimental core of TK960 well reservoir section contribute greatly to the recovery degree, The medium and small pores in the experimental core of medium water section contribute greatly to the recovery degree, The large and medium pores in the experimental core of strong water section contribute greatly to the recovery degree Residual oil is distributed in pores at all scales after core water displacement in different intervals of different Wells.
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Keywords:
- NMR /
- clastic rock /
- saturation /
- water flooding
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