火驱过程中储集层变化

Reservoir Changes in the Process of In-situ Combustion

针对火驱过程中储集层如何变化及其对火驱开发效果影响的问题,通过一维火驱物理模拟实验研究了砂岩、砂砾岩、泥岩在不同燃烧温度、不同燃烧时间条件下的孔隙度、渗透率变化情况,以及黏土矿物、矿物元素、流体元素等变化规律。结果表明,随着燃烧温度的增加和时间的延长,砂岩、砂砾岩孔隙度和渗透率都有增加的趋势;盖层在火驱过程中封闭性未受影响;火驱过程中黏土矿物会发生物化变化、相互转化,而饱和烃和芳香烃是主要被驱替的物质,胶质和沥青质主要为火驱提供燃料。

onto find out the reservoir changes in the process of in-situ combustion and their effects on fire flooding result,a 1D fire flooding physical experiment was carried out to study the porosity and permeability changes of sandstone,glutenite and mudstone under various combustion temperatures and time,as well as the variation patterns of clay minerals,mineral elements and fluid elements. The results show that as combustion temperature rises and time extends,the porosity and permeability of sandstone and glutenite tend to increase; the sealing capability of the cap rock is not affected during fire flooding; the clay minerals exhibit some changes in physical /chemical properties and conversion,while saturated HC and aromatics are the major substances to be swept,and resin and asphaltene mainly provide fuels for combustion.