摘要
陈堡油田C3断块K2t13厚油层内部有许多薄的泥质粉砂岩和砾岩隔层,根据对隔夹层的划分对比及分布特征研究认为:隔夹层将渗透层细分成多个流动单元使渗透层在纵向上连通性变差,造成了地下油水分布的不均匀性,无形之中增大了开采难度,油田开发过程中应按夹层分布状况,考虑分层段开采,通过研究夹层分布范围认为:在C3块K2t1特定油藏条件下,夹层延伸范围最佳为150～250 m,夹层延伸范围太小不能有效控制边底水,当夹层的渗透率小于'正常'储层的1/100,即Kh/Kv＞100时,夹层的作用接近于非渗透夹层,研究还表明该底水油藏不宜采用压裂措施.
Many thin argillaceous siltstone and conglomerate interbeds occur in the K2 t31 thick oil layers in C3 fault block, Chenbao oilfield. According to classification and correlation of the interbeds and study of their distribution features, it is believed that these interbeds subdivide the permeable layers into multiple flow units and lowers the vertical connectivity of the permeable layers, resulting in inhomogeneous distribution of oil and water. Separate zone production should be performed during oilfield development according to the distribution of interbeds. Based on study of the distribution range of interbeds, it is believed that the optimum extended range of interbeds is from 150 to 250m at the specific reservoir conditions in C3 block. Interbeds with too small extension ranges cannot effectively control edge and bottom water. When the permeability of interbeds is under 1/100 that of 'normal' reservoirs, i. e. Kb/Kv>100, the interbeds act similarly as non - permeable interbeds. The study also shows that fracturing treatment is not suitable in this bottom water reservoir.
出处
《河南石油》
2005年第4期26-29,共4页
Henan Petroleum
关键词
隔夹层
砂岩油藏
砂层组
渗流
厚油层
沉积微相
interbed, sandstone reservoir, sand layer unit, percolation, thick oil layer, sedimentary microfacies
