致密砂岩石油充注孔喉下限探讨——以鄂尔多斯盆地延安地区长6砂岩为例

Discussion on lower limit of oil charging throat of tight sandstone——An example from Chang 6 Member in Yan'an area of Ordos Basin

致密砂岩石油充注孔喉下限值的确定对于完善致密油成藏机理及增加后备地质储量具有重要意义。以往对这个问题研究存在很大争议。本次基于延安地区长6致密砂岩微观孔喉特征,优选含油产状和最小有效孔喉2种方法,综合确定长6砂岩石油充注孔喉直径下限值为150nm。

Determination of lower limit of pore throat for tight sandstone oil charging is important for improving tight oil accumulation mechanism and increasing reserve geological reserves.There has been a great deal of controversy about this problem.Based on the micro pore throat characteristics of Chang6tight sandstone in Yan’an area,Two methods of optimizing oil production attitude and minimum effective pore throat are comprehensively determined.The lower limit value of pore throat diameter of tight sandstone oil charging is150nm.