Abstract: Huashaoshan oilfield of Junggar basin is produced from a Permian naturally-fractured sandstone reservoir.30 imbibition expetiments with 24 rock samples indicated that on imbibition, a stronger relationship exists between imbibition time and efficiency, and imbibition capacity of rock matrix is relatively low, with ultimate absorption ratio of only 10.16%, moreover, the relationship between oil recovery factor and imbibition capacity of rock matrix is discussed.

Key words: Huoshacshan oilfield, Rock matrix, lmbibition experiment, Imbibition efficiency, Oil recovery factor