注水引发储集层流动单元变化研究——以鄂尔多斯盆地姬塬地区为例

doi:10.7657/XJPG20250507

摘要/Abstract

摘要：

现有流动单元划分是静态条件下的，难以反映随着注水开发推进，储集层物性的动态变化。为了研究注水开发过程中储集层流动单元的动态变化特征，以实现储集层流动单元的动态检测和开发方案的优化，以鄂尔多斯盆地姬塬地区延8₁小层为研究对象，选取流动单元静态评价参数定义为流动单元指数，通过拟合流动单元指数变化量与累计注水量的关系，将注水引起的流动单元指数变化量与流动单元静态评价参数结合，形成流动单元动态评价参数。研究表明，作为划分流动单元的标准，流动单元指数与注入剖面测试结果具有良好的相关性。以流动单元指数作为流动单元静态评价参数，将流动单元划分成3个类型。通过对比各阶段的储集层特征参数可以看出，随着注水开发的持续进行，储集层物性逐渐优化，更有利于流体流动。在相同的注水速度下，Ⅲ类流动单元的流动单元指数增幅显著高于Ⅰ类和Ⅱ类流动单元，但是Ⅲ类流动单元的流动单元指数增速小于Ⅰ类和Ⅱ类流动单元。

关键词: 鄂尔多斯盆地, 姬塬地区, 侏罗系, 延安组, 注水开发, 流动单元指数

Abstract:

Existing flow unit classification is primarily conducted under static conditions, making it difficult to reflect the dynamic changes in reservoir properties during water injection. To investigate the dynamic changes in reservoir flow units during water injection for optimizing the dynamic detection and development plans, this study takes the Yan-8₁ layer in the Jiyuan area of Ordos Basin as an example. The static evaluation parameter of the flow unit is defined as the flow zone index (FZI). By fitting the relationship between the cumulative water injection volume and the change in FZI (ΔFZI), the change in FZI caused by water injection is combined with the static evaluation parameter of the flow unit to form a dynamic evaluation parameter of flow units. The results show that as a standard for flow unit classification, FZI is correlated with the results of injection profile tests. Using FZI as the static evaluation parameter, the flow units are classified into three types (i.e. Ⅰ, Ⅱ, Ⅲ). By comparing the reservoir properties at various stages, it can be seen that as water injection continues, the reservoir properties are gradually improved to facilitate fluid flow. Given the same water injection rate, the increase in FZI for Type Ⅲ flow units is significantly higher than those for Type Ⅰ and Type Ⅱ, but its increase rate is lower than those of Type Ⅰ and Type Ⅱ.

Key words: Ordos Basin, Jiyuan area, Jurassic, Yan'an formation, water injection, flow zone index

中图分类号:

TE122

霍瑞麟, 李爱荣, 侯宾东, 尹帅, 谢红兵, 刘梦, 赵凯丽. 注水引发储集层流动单元变化研究——以鄂尔多斯盆地姬塬地区为例[J]. 新疆石油地质, 2025, 46(5): 575-581.

HUO Ruilin, LI Airong, HOU Bindong, YIN Shuai, XIE Hongbing, LIU Meng, ZHAO Kaili. Changes in Flow Units Caused by Water Injection: A Case from Jiyuan Area of Ordos Basin[J]. Xinjiang Petroleum Geology, 2025, 46(5): 575-581.

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