泌阳凹陷泌浅10区剩余油分布特征与开发技术对策

Distribution Characteristics and Development Measures of the Residual oil of Block Biqian 10 of Biyang depression

应用岩心、钻井、测井等资料对核三段Ⅳ油组砂体成因类型进行了分析。研究层段的沉积环境为三角洲前缘和前三角洲亚相,沉积微相包括水下分流河道、河道侧翼、分流间湾和远砂坝4类。水下分流河道砂体含油性好,河道侧翼较差,分流间湾为干层,研究区富油能力受构造和岩性的共同控制。研究认为,剩余油的形成与分布受多种因素控制,主控因素是沉积微相,同时还受储层非均质、微构造、夹层分布和射开程度所控制。针对研究区剩余油的分布特征,提出了提高波及系数的调堵措施、加大对薄油层的开采、提高含油"死角"动用程度的定向钻井或侧钻水平井等开发技术对策,并取得了较好的应用效果。

The paper analyzes the sand body origin types of Member Ⅳ of He 3 Formation by using the data of core,drilling,logging,etc.In the studied layers,sedimentary environment is delta front and delta subfacies;sedimentary micro-facies include 4 types,namely,underwater distributary channels,channel flank,interdistributary bay and distal bar.Oil saturation in underwater distributary channels is good,in channel flank poor and in interdistributary bay dry.The oil abundance in the studied region is controlled by both structure and lithology.The study shows that residual oil distribution is controlled by many factors,such as sedimentary micro-facies,reservoir heterogeneity,micro-structure,interbed distribution and perforation percentage,in which sedimentary micro-facies is the key factor.In view of the characteristics of residual oil distribution,it is raised that profile control and water shut-off simulation to increase sweeping efficiency should be adopted,more efforts of production should be made in thin layers and directional wells and sidetrack wells which can increase the recovery percentage for hard-to-touch oil reserve should be adopted.The technologies used are effective.