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研究了中国渤海湾北部油藏区砂岩储层中粘土矿物在高温、高压流动条件下矿物组分和体系结构的变化 ,原样包含石英、长石及粘土矿物等。提供了两组岩芯流动实验的结果 ,测试了样品在 150℃、2 0 0℃、2 50℃ ,pH值为 9、11、13下的反应结果 ,并对实验前后的样品做了X射线衍射分析、电子探针分析。实验结果表明 ,粘土矿物的转化和迁移是造成储层伤害的一个重要原因 ,一些离子对矿物反应有重要的影响作用。如何在开采过程中有效防止易膨胀粘土及易迁移粘土的生成是保持储层渗透性的关键。实验结果可用于砂岩储层的注热水 /汽开采过程。
The changes of mineral composition and structure of clay minerals in sandstone reservoirs in the northern Bohai Bay reservoir area under high temperature and high pressure were studied. The original samples contained quartz, feldspar and clay minerals. The results of two sets of core flow experiments were provided. The reaction results of samples at 150 ℃, 200 ℃, 250 ℃ and pH 9, 11 and 13 were tested. The X-ray Diffraction analysis, electron probe analysis. The experimental results show that the conversion and migration of clay minerals is one of the important causes of reservoir damage. Some ions have an important effect on the mineral response. How to effectively prevent expansive clay and migration-prone clay during the mining process is the key to maintain the permeability of the reservoir. The experimental results can be used for hot water / steam production in sandstone reservoirs.