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鄂尔多斯盆地苏里格庙气田盒 8气层处于晚成岩B期 ,普遍存在凝灰质等不稳定碎屑和填隙物 ,广泛发育各种类型的次生孔隙。为了探讨次生孔隙的成因 ,开展了地层条件及不同介质条件下的溶蚀模拟实验 ,运用环境扫描电镜同位扫描和能谱分析 ,对比溶蚀前后样品的成分 ,根据等离子发射光谱测定溶蚀后的水样成分。实验表明 ,含凝灰质砂岩的溶蚀量是石英砂岩溶蚀量的 7～ 11倍 ,且溶蚀量随乙酸酸度增加而加大 ;长石溶蚀滞后于凝灰质溶蚀 ,长石含量对溶出量没有特别明显的影响。研究结论 ,盒 8气层次生孔隙成因主要是蚀变凝灰质的溶蚀 ,并提出了含凝灰质砂岩的孔隙演化模式。图 4表 2参 5 (刘锐娥摘 )
The Box 8 gas layer of the Suligemia gas field in the Ordos Basin is in late-diagenetic stage B, where unstable detritus and interstitial materials such as tuff are widespread and various types of secondary pores are extensively developed. In order to investigate the origin of secondary pores, we carried out the simulation of dissolution under different formation conditions and different media conditions. By using the scanning electron microscopy (SEM) and energy spectrum analysis, we compared the composition of samples before and after dissolution and determined the water samples ingredient. Experiments show that the dissolution rate of tuffaceous sandstone is 7 ~ 11 times that of quartz sandstone, and the dissolution amount increases with the increase of acetic acid acidity; the dissolution of feldspar lags behind that of tuffaceous dissolution, and the content of feldspar is not obvious Impact. The conclusion is that the formation of secondary pores in Q8 is mainly caused by the dissolution of altered tuffs and the pore evolution model with tuffaceous sandstone is proposed. Figure 4 Table 2 Reference 5 (Liu Rui E pick)