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低渗透油气藏对地层有效应力很敏感，用常规压汞技术测得的三维应力释放后的岩样孔喉分布实际是视孔喉分布，与地下状态会有很大出入。用焉耆盆地宝浪油田２０块低孔低渗天然柱状岩心，分成２０对平行样，分别采用有效应力下单向水平流动压汞技术和常规压汞技术测定它们的压汞曲线，进行２种实验技术的对比实验研究。与常规压汞技术测定结果相比，在有效应力作用下的单向水平流动压汞技术测得的岩样毛细管排驱压力、中值压力大幅度增加（分别增加７７．８９％和５８．１６％），孔喉的最大半径和中值半径大幅度降低（分别降低７５．４％和６１．１７％），喉道分选性变好，空气渗透率降低幅度大（７１．６２％），孔隙度降低幅度较小（１３．０８％）。单相水平流动压汞与常规压汞所得的低渗透油藏的孔喉分布特征参数差别大，但二者相关性良好，在对低渗透油藏岩样进行大量常规压汞测试的同时，进行少量的单向水平流动压汞与常规压汞对比实验，就可由大量常规压汞资料准确获得地层有效应力作用下低渗透油藏储集层的孔隙结构特征参数。图４表１参３（郭海莉摘）
Low-permeability reservoirs are sensitive to the effective stress of the formation. The pore-throat distribution of rock samples after three-dimensional stress release measured by the conventional mercury intrusion technique actually depends on the distribution of pore throats and greatly varies with the underground state. 20 low-porosity and low-permeability natural cores in the Baolang Oilfield, Yanqi Basin, were divided into 20 pairs of parallel samples. Their mercury intrusion curves were measured by one-way horizontal flow mercury injection under effective stress and mercury intrusion respectively. Two kinds of experiments Comparative experimental study of technology. Compared with the results of conventional mercury intrusion technique, the capillary pressure and medium pressure of rock sample measured by unidirectional horizontal flow mercury injection under effective stress increased significantly (by 77.89% and 58.16 respectively %), The maximum radius and median radius of pore throat decreased significantly (75.4% and 61.17% respectively), the throat separation became better and the air permeability decreased greatly (71.62%), Porosity decreased less (13.08%). The characteristics of pore-throat distribution parameters of single-phase horizontal-flow mercury injection are different from those of conventional mercury injection. However, the correlation between the two parameters is good. While conducting a large number of routine mercury intrusion tests on low-permeability oil samples, A small amount of one-way horizontally flowing mercury injection compared with conventional mercury injection can accurately obtain the pore structure parameters of low permeability reservoirs under the effective formation pressure by a large number of conventional mercury intrusion data. Figure 4 Table 1 Reference 3 (Guo Haili Abstract)