乌尔逊凹陷主要成藏期大一段盖层的毛细管封闭性

Capillary seal characteristic of k_1d_1 caprock in Wuerxun depression and its geological significance in main accumulation period

在分析乌尔逊凹陷大一段盖层发育特征的基础上,研究了其目前毛细管封闭特征,结果表明,整个凹陷具有好的毛细管封闭能力,有利于目前游离相油气的聚集和保存.在古埋深恢复的基础上,利用排替压力与埋深之间的关系,预测了乌尔逊凹陷主要成藏期(伊敏组沉积末期—青元岗沉积早期的排替压力,确认整个凹陷具有好的毛细管封闭能力,这即是南二段能获得多口工业油气井的重要原因.

Based on the study of the development characteristic of k_1d_1, in this paper the present capillary seal characteristic of k_1d_1 is discussed, and the results indicate that there exist the best capillary ability of k_1d_1 in the whole Wuerxun depression. After the recovery of the ancient depth ,the displacement pressure of k_1d_1 caprock in main accumulation period from the end of k_1y to the early of k_2q is forecast. Finally, the capillary seal ability from the end of k_1y to the early of k_2q is considered to be the best, which leads to the fact that lots of industrial oil or gas wells have been drilled in k_1n_2.