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浅部流体对花岗岩储集空间改造作用实验研究
Experimental research on reformation of shallow fluid on granite reservoir space
【摘要】 以渤海中生界花岗岩为研究对象,利用高压釜设备开展大气水、有机酸(地层水)、大气水+有机酸(地层水)3种不同流体与花岗岩进行相互作用实验。实验前后样品分析表明:3种流体在不同温度下与组成花岗岩的主要矿物碱性长石、斜长石发生相互作用,碱性长石、斜长石发生不同程度的溶蚀、溶解、次生作用,并形成次生孔隙和高岭石等次生矿物,提高了样品面孔率和喉道平均值;实验样品的重量在反应前后存在差异,具有温度越高样品重量损失越多的趋势。通过实验对比分析3种流体对花岗岩样品的改造结果可知,有机酸(地层水)溶液对花岗岩样品在提高储层物性上较其他2种溶液效果明显。
【Abstract】 This study designs three dissolution experiments focusing on the interaction of three kinds of fluid with Bozhong granite in autoclave equipment. The three kinds of fluid include atmospheric water,organic acid( ground water) and organic acids in atmospheric water( ground water). The sample analysis before and after experiment shows that the fluids interact with alkali feldspars and plagioclases which are the major minerals in granite. Different degrees of corrosion,dissolution and secondary action happen to the alkali feldspars and plagioclases at different temperatures. The secondary porosity and secondary minerals such as kaolinite are also formed which increase the surface porosity and the average throat size. There are differences in the weight of samples before and after the reaction,and it is found that the higher the temperature,the smaller the residual weight. The analysis of the three interaction results indicates that the organic acid( ground water) has the most obvious impact on improving the granite reservoir properties compared with the other two kinds of solution.
- 【文献出处】 世界地质 ,Global Geology , 编辑部邮箱 ,2017年01期
- 【分类号】P618.13
- 【被引频次】3
- 【下载频次】94