伊通地堑莫里青盆地双阳组储层敏感性研究

Reservoir Sensibility Research on Shuangyang Formation in Moliqing Basin of Yitong Graben

莫里青盆地双阳组储层中岩石不稳定组分多 ,胶结物以敏感性强的粘土矿物和碳酸盐为主 ,孔隙结构为中孔细喉 ,储层物性差 ,原油石蜡沥青组分多 ,地层水矿化度低 ,存在潜在的敏感性。分析表明 ,储层填隙物中的粘土矿物、碳酸盐矿物是导致该区储层敏感性的主要因素。结合敏感性实验证实 ,本区储层的敏感性主要为中 -强水敏、盐敏和中等碱敏 ,酸敏性在盆地控盆断裂带不明显 ,但在缓坡带较强。建议在钻井、酸化等作业时注意防膨和控制注入流体的pH值及盐度 ,以有效地保护储层 ,提高油气勘探开发的经济效益。

The reservoir of Shuangyang formation in Moliqing basin has potential reservoir sensibility, because the unstable compositions in rock are high, the main cements are clay minerals and carbonate with stronger sensibility ,because of most pore textures with mid-pore and fine-throat, because of high amounts of paraffinand asphalt, and because of low mineral degree of formation water. Shown by analysis, the main factors causing the reservoir sensibility in this area are clay minerals and carbonate. Associated with sensibility experiments, it is proved that the main reservoir sensibility in this area are mid-high water-sensibility, salt sensibility and mid-alkali sensibility. The acid-sensibility is not clear in the slope belt of the depression basin, but is stronger in the belt of control fault. In order to protect reservoir efficientlyand improve the benefit of oil-gas exploration and development in Moliqing basin, the author suggests that people should pay attention to prevent expand of clay minerals and to controlthe pH value and salinityof the inflow fluid during the works such as drilling,acidification,and so on.