蒙古林砾岩油藏储集层非均质性研究

二连盆地蒙古林油藏的储集层为块状砂砾岩，发育于辫状河三角洲推进式的沉积环境，总体为正复合韵律，非均质性严重。统计该油藏3个小层的沉积特征和储集层参数，砂砾岩体的分布和渗透性受沉积微相和泥质含量控制，辫状河道微相最好的有效储集层居多，水下河道微相以较好的储集层为主，水下河道侧翼微相以较差的储集层为主，水下漫堤微相为非储集层。致密砂砾岩夹层和泥岩隔夹层的发育程度和稳定程度从西北向东南逐渐增强，辫状河道微相和水下河道微相夹层少，稳定程度和连通程度低；水下漫堤微相夹层厚度较大，稳定程度较高；河道间微相和水下河道侧翼微相夹层发育程度和稳定程度居中。表3参7

Heterogeneity of conglomerate reservoir in the Menggulin Oilfield, Erlian Basin

The reservoirs in the Menggulin Oilfield are developed in a progressive developing braided channel and in a normal composite rhythm, with strong heterogeneity. The distribution of permeability and reservoirs are controlled by the sedimentary microfacies and the mud content, the best reservoirs mainly distributed in the braided channel micorfacies, better reservoirs are in the subaqueous channel, the worse reservoirs, in the subaqueous channel flank and the non-reservoirs in the subaqueous breach. The development and stability of tight sand or conglomerate interbed and the shale band are all gradually changing better from the northwest to southeast. There are the low quantity of interbed, the low stability and connectivity in the braided channel micorfacies, there are the higher quantity interbed, the higher stability and connectivity in the subaqueous breach, the interbasin and underwater channel flank microfacies.