深水浊积水道型储层砂体连通性定量表征探索

Quantitative Characterization of Sand Body Connectivity in Deepwater Turbidite Channel Reservoir

在深水浊积水道型油田开发实践中发现,因砂地比较高、储层品质较好,作为开发单元的复合水道砂体表现为整体泛连通,但是在不同位置连通情况存在差异。为准确、精细地刻画水道砂体内部不同位置的连通程度,提升注采受效和开发效果,采用构型表征的方法,将储层砂体细分为构型单元和构型边界,结合西秦岭地区重力流沉积露头展现出的精细特征分别定量刻画其对连通性的影响,并通过地质模型应用于开发生产。研究发现,对高砂地比的浊积水道型储层而言,水道构型单元和水道构型界面同时影响连通性,且一般构型界面占主导,可以采用构型单元-界面二元表征的方法将砂体间特征对连通性的影响加以刻画;通过“连通系数”定量刻画和衡量砂体间的连通情况,并通过“等效替代”的方法计算连通系数。

In the development practice of deep-water oilfield,it is found that the composite channel sand body as a development unit bears overall pan-connectivity because of its high sand-ground ratio and good reservoir quality,but there are differences in connectivity in different positions.In order to accurately and finely depict the connectivity of different positions in the channel sand body,and improve the injection-production efficiency and development effect,the reservoir sandbodies are subdivided into configuration units and configuration interfaces by using the method of configuration.The impact of the fine characteristics of gravity flow sedimentary outcrop in the west Qinling Area on connectivity is quantitatively described,and geological model is used to applied it to the development and production.It is found that for turbidite channel reservoirs with high NTG,both channel configuration unit and channel configuration interface affect connectivity at the same time,and generally configuration interface is dominant,the influence of sand body characteristics on connectivity can be described by"configuration unit-interface binary modeling method",the connectivity between sand bodies can be quantitatively described and measured by"connectivity coefficient".The"equivalent substitution"method can be used to calculate the connectivity coefficient.