Reservoir Petrophysical Characterization in High Water Cut Stage in Gudao Oilfield
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摘要: 孤岛油田馆陶组细粒砂岩储层表现为粗孔大喉高渗特点, 储层孔隙结构分6种类型.砂岩中粘土矿物以伊/蒙混层(I/S)和高岭石(K)为主, 储层存在速敏和水敏现象.油田特高含水期与开发初期、中高含水期比较, 砂岩渗透率成倍增加; 泥质含量和束缚水含量明显降低.受河流沉积相带的控制, 4种河道微相单元储层物理特征变化较大.Abstract: Reservoir sandstones have big pore space; wide throat size and high permeability in Guantao Formation, Gudao Oilfield. Reservoir pore textures can be divided into 6 types. The main clay minerals are I/S mixed and kaolinite in fine grain size sandstones. Water sensibility and flow sensibilities exist in reservoir. Comparing the very high water cut stage with early and middle stage of oilfield development, sandstone's permeability increases several times, and the contents of clay and immovable water decrease obviously. Reservoir petrophysical parameters were different in 4 micro-facies units controlled by fluvial facies in Gudao oilfield.
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Key words:
- highwater cut stage /
- reservoir physical property /
- clay mineral /
- Gudao oilfield
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图 1 馆3-5油组典型压汞曲线
Fig. 1. Typical mercury capillary pressure curves of Guan 3-5 oil set
图 2 孤岛油田中30-J18井典型砂岩图像分析孔喉比
Fig. 2. Diagram of pore and throat size ratio of representative samples in Z30-J18 well using imaging analysis
图 3 中30-J18井粘土矿物含量随深度变化
Fig. 3. Content variety of clay minerals with burial depth in Z30-J18 well
图 4 渤字号3口井(20世纪70年代)与中30-J18井(1995年)物性变化对比
Fig. 4. Comparison of physical properties in early well and new well
表 2 孤岛油田不同开发时期高渗段储层参数变化
Table 2. Reservoir parameters in different developing stage of Gudao oilfield
表 3 河流不同微相单元储层特征对比①
Table 3. Comparison of reservoir properties in different microfacies
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