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为了认识塔河油田奥陶系缝洞型碳酸盐岩油藏的渗流特征,笔者针对塔河油田4区奥陶系缝洞型碳酸盐岩油藏开展渗流机理模拟试验研究。试验样品来源于塔河油田岩心,具有弱微亲油性,实物岩心的储集体主要为小型的溶蚀孔洞和裂缝。采用照相和光刻技术制作微观模型。采用塔河实际的油样和与其相近的水样进行水驱油机理模拟试验。试验结果表明:碳酸盐岩油藏中裂缝(或大的溶洞)是主要渗流通道,对于注入水的流动特点和油水饱和度的分布具有控制作用。剩余油均分布在基质的微细裂缝中,提高驱替速度后,部分残余在微细裂缝中的油可以被驱替出来。
In order to understand the seepage characteristics of Ordovician fractured-hole carbonate reservoirs in Tahe Oilfield, the author conducted a simulation study on seepage mechanism of Ordovician fractured-hole carbonate reservoirs in Block 4 of Tahe Oilfield. The test samples are derived from the core of Tahe Oilfield and have a weak lipophilicity. The reservoirs of physical cores are mainly small dissolved pores and fractures. Using photographic and photolithographic techniques to make microscopic models. Tahe actual oil samples and water samples similar to the water flooding mechanism simulation test. The experimental results show that the fractures (or large caves) in carbonate reservoirs are the main seepage channels, which have a controlling effect on the flow characteristics of injected water and the distribution of oil-water saturation. The remaining oil are distributed in the matrix fine cracks, improve the displacement rate, the part of the oil remaining in the fine cracks can be flooded out.