应用吸水剖面进行油藏纵向剩余油分布定量研究

采用注水井测试的吸水剖面对辽河前 3—沈 12块油藏纵向剩余油分布进行了定量研究 ,重点研究了注水井段长度和地层系数 (KH 值 )对油层相对吸水强度的影响及吸水油层的 K H 下限值。当注水井段长度小于2 5 0 m时 ,平均相对吸水强度随注水井段长度的增大而降低 ;当注水井段长度大于 2 5 0 m时 ,平均相对吸水强度随注水井段长度的增大变化不大 ;油层 K H 值低于本井 K H 值最大值的 1/ 10时为不吸水层。考虑注水井段在不同时期的调整变化 ,分阶段计算了注水井纵向各小层的注水量。根据各层注水量与地质储量的比值 ,评价了各层的动用状况 ,并推算出各层的产油量和剩余储量

A QUANTITATIVE STUDY ON VERTICAL DISTRIBUTION OF REMAINING OIL THROUGH INJECTION PROFILES

A quantitative study on vertical remaining oil distribution is conducted using injection profiles in injection wells in Block Qian3 Shen12 of Liaohe oilfield, with the emphases on effects of the injection interval length and formation factor (KH value) on the relative injection index as well as lower limit of KH in injected reservoir. When length of injection interval is less than 250m, the average injection index will decrease with expanding of the length. The average injection index will change slightly with expanding of injection interval length when it is more than 250m. If a reservoir has a KH value that is lower than 1/10 of the maximum KH in the same well, it will be a non absorbing bed. Considering adjustment of injecting intervals in injection wells during various periods, we calculated injected volume in each substratum for each period. Then production and remaining reserves can be deduced for each substratum through recovery evaluation from the ratio of injected volume to geological reserve.