长庆油田Z油区长3储层非均质性的研究

长庆油田Z油区的储层类型主要为陆相碎屑岩储层,其特点是地质情况较为复杂,储层非均质性严重制约着油田的开发效果。本文以长3为例,通过对长庆油田Z区域的数据及资料分析来研究长3储层岩性特征、孔隙结构、渗透率特征,并分析储层非均质性对注水开发的影响。研究发现,Z油区长3属于低孔低渗储层,其渗透率的变异系数(Vk)0.754、突进系数(Tk)3.298、级差(Jk)53、均质系数(Kp)0.302,储层非均质性强,从而导致该区开发效果较差。研究分析表明,该区呈现的强非均质性,主要是受了沉积环境和成岩作用的影响。

Research on the heterogeneity of Chang 3 in Z oil area of Changqing oilfield

The Z oil area of Changqing oilfield types in this area are mainly continental clastic reservoirs, which are characterized by complicated geological conditions. Reservoir heterogeneity seriously restricts the development effect of oilfield. Taking Chang 3 as an example, the author uses data analysis to study the regional characteristics of reservoir rock, pore structure and permeability characteristics of Chang 3 reservoir. The effect of reservoir heterogeneity on water injection development is also analyzed. It is found that the Z oil area of Chang 3 is a low-porosity and low-permeability reservoir. The variation coefficient(Vk)of Chang 3 permeability in the study area is 0.754, the inrush coefficient(Tk)is 3.298, the grade difference(Jk)is 53, and the homogeneity coefficient(Kp)is 0.302. The reservoir heterogeneity is strong, resulting in poor development effect in this area. The research and analysis show that the strong heterogeneity in this area is mainly affected by sedimentary environment and diagenetic process.