渤海A油田砂体连通性研究

Study of connectivity of sand bodies in oilfield A,Bohai area.

在渤海A油田开发中,对河道砂体连通性的可靠描述关乎注采井网的合理部署及采收率的提高。为此,针对A油田储层主要为点砂坝、天然堤和决口扇,砂体数量多,厚度小的特点,采取了一系列有效技术和措施,包括测井资料信息统计、地层切片技术、多地震属性聚类分析技术等,对砂体的连通性进行了研究。研究结果表明,这些技术很好地解释了油田开发中存在的问题,即原先描述的独立砂体,在注采开发中却发现并不连通,其实是2个甚至是多个砂体叠置。根据重新描述的砂体连通性,调整了注水井,优化了注采井网。注采实例表明,上述方法可以较好地解决河流相沉积类型油田的砂体连通性描述问题,提高油田的采收率。

In the development of oilfield A,Bohai area,accurate descrip- tion of connectivity of sand bodies is closely related with the rea- sonable layout of injection-production pattern and the improvement of recovery ratio.The reservoirs in oilfield A are mainly point bar, natural barrier,and crevasse splay.In addition,there are many thin sand bodies.Aiming at this situation,we have adopted a se- ries of effective technologies to study the connectivity of sand bodies,including logging data statistics,strata slice technology, and multi-attributes cluster analysis,etc.The results show that these technologies can well interpret the problems existing in oil- field development.Some former interpreted independent sand body was found un-connected in oilfield development,which is actually overriding of two or more sand bodies.In terms of the reinterpre- ted connectivity,the injection wells were adjusted,and the injec- tion-production pattern was optimized.Injection-production sample shows that the above mentioned method can well solve the problem of describing sand body connectivity in fluvial facies oilfield so as to improve the recovery ratio.