中文摘要：

通过页岩流体敏感性损害试验和液氮吸附试验研究龙马溪组黑色页岩在流体矿化度和pH值变化时岩石渗透率和纳米孔隙结构的变化.结果表明：龙马溪组页岩经流体损害后,速敏、盐敏和碱敏损害程度表现为中等偏强到强;页岩微孔和中孔分布并不均匀连续,孔径为1 ～ 30 nm,以0.3和3.8nm分别为峰值的双峰分布;盐敏损害对岩石纳米孔的影响较小,碱敏损害使页岩孔喉直径减少13.20％,比表面积增加32.85％,同时产生大量1 nm孔隙,孔径分布由损害前的双峰状改变为三峰状分布;流体对岩石的溶蚀作用及新矿相的生成是页岩产生盲端微孔和连通微孔阻塞的原因.

英文摘要：

The shale permeability and nano-pore structure variation of the black shale in Longmaxi group were studied subjec-ting different fluid salinities and pH via a fluid sensitivity damage method and nitrogen adsorption experiment. The resultsshow that the degrees of the sensitivities of the shale rock sample to flow, salt and alkali damages can be ranked as mediumto strong. The distributions of micropores and medium pores in shale are not uniformity. The pore diameter varies from 1 to30 nm, with a bimodal distribution peaks at 0. 3 nm and 3. 8 nm. Salt sensitivity damage has little impact on the nano-pores,while alkali sensitivity damage can make shale pore diameter reduce by 13.20%, and the specific surface areas increase by 32.85%. Alkali sensitivity damage can generate a large number of micropores around 1 nm in diameter, which makes the o-riginal bimodal distribution of pore sizes into tri-modal peaks. The fluid dissolution and new ore generated are the reasons thatmight produce many blind-end micropores and may also block some connected micropores.