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致密砂岩气层的研究是目前的研究前沿之一.利用铸体薄片、物性、高压压汞、micro-CT、岩电实验等分析化验资料,探讨了鄂尔多斯盆地定北地区二叠系太原组致密砂岩不同成岩相类型对岩电特征的控制作用.研究表明:研究区可以划分为4种成岩相类型,包括硅质胶结成岩相、高岭石部分充填成岩相、不稳定组分溶蚀成岩相,压实致密成岩相.4种成岩相类型地层因素和孔隙度在同一趋势线上,可以采用统一的a,m值.4种成岩相类型的n值有明显差异,取值依次为2.30、1.51、2.03和4.04.含气饱和度解释实例显示,对不同成岩相取不同n值与试气结果吻合较好,优于n值取理论值2的结果.
The study of tight sandstone gas reservoirs is one of the frontiers of research.During the Permian Taiyuan Formation in Dingbei area, Ordos Basin, the authors used the analysis of laboratory samples, such as thin castings, physical properties, high pressure mercury intrusion, micro-CT, The results show that the study area can be divided into four types of diagenetic facies, including siliceous diagenetic facies, kaolinite partially filled diagenetic facies, unstable component diagenetic diagenetic facies, Compaction compact diagenetic facies.The four types of diagenetic facies and porosity in the same trend line, you can use a unified value of the m.The four types of diagenetic facies n values were significantly different, the values were 2.30,1.51 , 2.03 and 4.04, respectively. The gas saturation interpretation examples show that the different n values obtained from different diagenetic phases are in good agreement with the test gas results, which is better than the result obtained from the theoretical value 2 of n values.