石油实验地质2016，Vol.38Issue(3)：395-401,7.DOI:10.11781/sysydz201603395
深埋砂岩储层长石溶孔率定量计算的新方法及应用——以鄂尔多斯盆地陇东地区长81储层为例
A new method for the calculation of secondary porosity originating from the dissolution of feldspars in deeply buried formations and its application:A case study of the Chang 81 Formation in Longdong area, Ordos Basin
摘要
Abstract
Secondary porosity is an important accumulation space in clastic reservoirs. Among secondary pores, those pores originating from the dissolution of feldspars are dominant. A new method to calculate the volumes of secondary porosity from the dissolution of feldspars in deeply buried formations based on thermodynamic principle is proposed. The calculation method is as follows. The volume of secondary porosity originating from the dissolu?tion of potassium feldspars=0.28×kaolinite content or 0.36×illite content. The volume of secondary porosity origi?nating from the dissolution of albite feldspars=0. 10 × kaolinite content or 0. 17 × illite content. The volume of secondary porosity originating from the dissolution of anorthite feldspars=0.014×kaolinite content or 0.08×illite content. After a thorough investigation of petrologic characteristics, the new calculation method was applied to the Chang 81 Formation in Longdong area, Ordos Basin. The volumes of secondary porosity originating from the disso?lution of feldspars in deeply buried formations in the Chang 81 Formation in the study area were calculated with the new method, and were compared with measured and simulated porosities. The average value of calculated secondary porosity from the dissolution of feldspars of 51 core samples from the Chang 81 Formation is 1.32%, which is close to the average measured value (1.44%) for those samples. The comparison between calculated and simulated results also confirms the reliability of this new method.关键词
长石溶蚀/次生孔隙/计算方法/模拟实验,长81储层/陇东地区/鄂尔多斯盆地Key words
feldspar dissolution/secondary porosity/calculation method/simulation experiment/Chang 81 Formation/Longdong area/Ordos Basin分类
能源科技引用本文复制引用
杨友运,刘喜强,孙睿..深埋砂岩储层长石溶孔率定量计算的新方法及应用——以鄂尔多斯盆地陇东地区长81储层为例[J].石油实验地质,2016,38(3):395-401,7.基金项目
国家油气重大专项(2011ZX05044)和国家重点基础研究发展计划(973计划)项目(2014CB239003)资助. （2011ZX05044）
