PORE STRUCTURE AND EVALUATION OF UPPER PALEOZOIC RESERVOIRS AT YIMENG UPLIFT, ORDOS BASIN
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摘要:
储层是油气赋存的载体，其孔渗性能决定着后期油气开采难度以及可采数量。在众多影响储层孔渗性能的因素当中，储集层的孔隙结构发挥了关键的作用。通过对鄂尔多斯盆地伊盟隆起上古生界储层岩性以及孔渗参数进行分析，结果表明：石盒子组孔喉连通性及渗流性能最好，其次是山西组，太原组最差；依据压汞资料和毛细管压力曲线形态，孔隙结构类型可以划分为4类；通过孔渗资料统计分析，上古生界砂岩划分4类，并以Ⅱ类和Ⅲ类储层为主；砂体主要为冲积扇辫状水道砂体，曲流河、辫状河河道砂坝砂体以及三角洲平原分流河道砂体。研究结果可以为伊盟隆起区上古生界的油气开发提供依据。
Abstract:As the carrier of oil and gas, the porosity and permeability of a reservoir play a critical role in oil and gas exploitation and determine the recoverable amount of oil and gas, particularly in the later stage. Among many of the factors that affect reservoir physical properties, the pore structure is the key. In this paper, we studied the lithology and pore permeability parameters of the Upper Paleozoic reservoir at the Yimeng Uplift of Ordos basin. Results show that the Shihezi Formation is the best followed by the Shanxi Formation, and the Taiyuan Formation is the worst in terms of pore connectivity and flowing property. Pore structures there can be divided into four categories according to mercury injection data and capillary pressure curve. The upper Paleozoic sandstone is then divided into four classes dominated by class Ⅱ and Ⅲ reservoirs based on the statistical data of porosity and permeability. The reservoirs are mainly sand bodies formed in braided channels of alluvial fans, channel-mouth bars of meandering and braided rivers as well as the distributary channels of deltaic plains. The study results may help oil and gas development in the Upper Paleozoic of the Yimeng Uplift.
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Key words:
- Ordos Basin /
- Yimeng Uplift /
- Upper Palaeozoic /
- reservoir /
- pore structure
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表 1 太原组孔隙结构参数(样品数9个)
Table 1. Pore structural parameters of Taiyuan Formation
参数 排驱压力/MPa 中值压力/MPa 中值半径/μm 分选系数 变异系数 均值 最大汞饱和度/% 退汞效率/% 最大 1.63 8.86 3.38 2.69 3.17 12.6 95.3 42.2 最小 0.019 0.22 0.008 3 1.5 0.12 0.85 8.57 0 平均 0.70 3.16 1 2.07 0.53 9.37 76.46 31.3 
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表 2 山西组孔隙结构参数(样品数57个)
Table 2. Pore structure parameters of Shanxi Formation
参数 排驱压力/MPa 中值压力/MPa 中值半径/μm 分选系数 变异系数 均值 最大汞饱和度/% 退汞效率/% 最大 2.73 123.53 12.77 5.25 1.216 13.58 92.2 60.9 最小 0.014 0 0 1.1 0.08 3.7 0.41 8.5 平均 0.926 11.74 0.77 2.12 0.22 11.33 66.28 40.64
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表 3 石盒子组组孔隙结构参数(样品数88个)
Table 3. Pore structure parameters of Shihezi Formation
参数 排驱压力/MPa 中值压力/MPa 中值半径/μm 分选系数 变异系数 均值 最大汞饱和度/% 退汞效率/% 最大 6.57 86.79 1.7 4.16 0.415 14 94.8 72.4 最小 0.027 0 0 0.7 0.05 9.3 3.9 3.5 平均 1.21 15.3 0.114 1.8 0.15 12.3 72.19 40.2
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表 4 上古生界砂岩储层分类标准
Table 4. Classification standard of Upper Paleozoic Sandstone Reservoir
分类特征 Ⅰ类 Ⅱ类 Ⅲ类 Ⅳ类 好 中等 差 极差 物性 孔隙度/% ≥12 8~12 4~8 ≤4 渗透率/(×10-3μm 2) ≥1.0 1.0~0.5 0.5~0.1 ≤0.1
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