| 应用恒速压汞技术定量评价低渗—特低渗砂岩储层微观孔喉特征:以石臼坨凸起陡坡带东三段为例 |
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| 引用本文： | 万琳,王清斌,代黎明,汤国民,彭琴.应用恒速压汞技术定量评价低渗—特低渗砂岩储层微观孔喉特征:以石臼坨凸起陡坡带东三段为例[J].高校地质学报,2018,24(4):584. |
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| 作者姓名： | 万琳 王清斌 代黎明 汤国民 彭琴 |
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| 作者单位： | 中海石油(中国)有限公司天津分公司渤海石油研究院 |
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| 摘 要： | 砂砾岩储层中的低渗—特低渗砂岩对储层整体油气运聚、成藏起到了重要影响。利用恒速压汞技术探讨石臼坨凸起陡坡带东三段扇三角洲砂砾岩储层中不同渗透率级别的低渗—特低渗砂岩储层微观孔喉分布特征及不同尺度孔喉的物性贡献。研究表明:(1)低渗—特低渗砂岩和常规砂岩相比具有孔隙大小中等,喉道半径偏小,孔喉比异常大的特点。渗透率受孔喉半径变化影响更明显,大半径喉道数量和分布是影响储层渗流能力的关键因素;(2)低渗—特低渗砂岩孔隙主控进汞区是控制流体流动最有效最主要的空间,渗透率越高,孔隙主控区的喉道半径范围越大。孔喉过渡进汞区进汞贡献主要来自孔隙和喉道联合进汞,随着喉道半径减小,细喉道逐渐成为流体储集和流动的主要空间;喉道主控区渗透率贡献也很低,微细喉道及微喉道是进汞主体空间,孔隙贡献基本为0,该阶段流体流动能力受喉道半径变化影响较大。随着渗透率增加,低渗—特低渗砂岩渗流能力的决定性喉道半径值从1~2μm增大到3~4μm。基于恒速压汞技术的低渗—特低渗砂岩微观孔喉定量表征填补了渤海海域相关研究的空白,从而有助于实现该类储层全面准确的储层评价。
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| 关 键 词： | 低渗-特低渗砂岩 砂砾岩 恒速压汞 微观孔喉特征 |
Quantitative Evaluation of Micro-Pore and Throat Characteristics in Low-Ultra Low Permeability Sandstone Reservoirs by Using Constant-Rate Mercury Injection Technique: A Case Study of the Ed3 in the Steep Slope Zone (Shijiutuo Uplift) |
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| WAN Lin,WANG Qingbin,DAI Liming,TANG Guomin,PENG Qin.Quantitative Evaluation of Micro-Pore and Throat Characteristics in Low-Ultra Low Permeability Sandstone Reservoirs by Using Constant-Rate Mercury Injection Technique: A Case Study of the Ed3 in the Steep Slope Zone (Shijiutuo Uplift)[J].Geological Journal of China Universities,2018,24(4):584. |
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| Authors: | WAN Lin WANG Qingbin DAI Liming TANG Guomin PENG Qin |
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| Abstract: | The low-ultra low permeability sandstones in the glutentite reservoirs play an important role in the oil migration and
accumulation. To understand the micro-pore and throat distribution and contribution of different sizes of pores and throats to physical
property of tight sandstones with different permeability grades, a case study was conducted in the fan delta glutenite reservoirs of the
steep slope zone of the Shijiutuo uplift by using constant-rate mercury injection technique. Results show that low-ultra low permeability
sandstones are characterized by medium pore size, small throat radius and large pore throat ratio compared with conventional
sandstones. Permeability is affected by pore and throat radius obviously, and the number and distribution of the throat with large radius
are key to affect the seepage capacity of reservoir. The pore-controlled mercury entry zone is the most effective and important space for
fluid flow. The higher the permeability is, the larger the throat radius of the pore master zone is. In the pore-throat transition mercury
zone, mercury is mainly combined by pore and throat. With the decreasing of throat radius, fine throat gradually becomes the main
space for fluid storage and flow. The contribution of permeability in the main control area is also very low. The micro-and fine-throat are
throat radius. With the increasing of permeability, the critical throat radius of the permeability of the low-ultra low permeability
sandstones increases from 1-2 μm to 3-4 μm. Therefore, based on the constant-rate mercury injection technique, quantitative
characterization of micro-pore and throat of low and ultra low permeability sandstones fills the research gap in the Bohai area. This
would be helpful to the realization of comprehensive and accurate evaluation of such reservoirs. |
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| Keywords: | low-ultra low permeability sandstone glutenite constant velocity mercury injection micro pore throat characteristics |
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