| 徐永强.鄂尔多斯盆地陇东地区长7致密储层微观孔喉特征及其对物性的影响[J].地质与勘探,2019,55(3):870-881 |
| 鄂尔多斯盆地陇东地区长7致密储层微观孔喉特征及其对物性的影响 |
| Characteristics of microscopic pore throats and their influence on physical properties of the Chang7 tight reservoir in the Longdong area, Ordos Basin |
| 投稿时间：2018-09-29 修订日期：2019-02-10 |
| DOI：10.12134/j.dzykt.2019.03.019 |
| 中文关键词: 致密储层 微观孔喉特征 物性 氮气吸附 陇东地区 鄂尔多斯盆地 |
| 英文关键词: tight reservoir, characteristics of microscopic pore throat, physical property, nitrogen adsorption, Longdong area, Ordos Basin |
| 基金项目:“十三五”国家油气重大专项（编号：2016ZX05046）和国家自然科学基金重大项目（编号：41390451）联合资助 |
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| 中文摘要: |
| 鄂尔多斯盆地陇东地区长7储层富含大量致密油，为了深入了解其微观孔喉特征，并为致密储层评价开发提供依据，本文通过铸体薄片、扫描电镜、恒速压汞、高压压汞、氮气吸附实验、岩心物性分析等测试方法和手段，对长7致密储层微观孔喉结构特征进行了研究并分析其对物性的影响。结果表明，陇东地区长7储层平均孔隙度为9.33%，平均渗透率为0.25mD，平均面孔率为2.06%，岩石孔隙类型主要为粒间孔和长石溶孔，所占比例分别为42.7%、42.2%。孔隙平均半径为157.1μm，喉道平均半径为0.52μm，平均孔喉半径比为572.7；纳米级孔喉以狭缝平板状毛细孔为主，孔隙比表面积较大，平均值为2.5731m2/g；孔喉整体较为细小，分选较好，储集能力较强，但连通性较差，孔径主要分布于25~500nm范围内。孔喉大小是影响储层物性的重要因素，其中喉道大小是影响渗流能力的主要因素，大孔喉为储层提供了主要渗流通道，孔喉半径比对流体渗流也有一定的控制作用。 |
| 英文摘要: |
| The Chang7 reservoir in the Longdong area of Ordos basin hosts abundant tight oil. To further understanding characteristics of its microscopic pore throats and their influence on the physical properties, this work conducted a series tests to provide evidence for evaluation and development of tight reservoirs. The used tools include casting thin sections, scanning electron microscope, constant-rate mercury injection, high-pressure mercury injection, nitrogen adsorption and other physical property analysis. The results show that the average porosity of the Chang7 reservoir in the Longdong area is 9.33%, the average permeability is 0.25mD and the average face porosity is 2.06%. The main pore types of sandstone are intergranular and feldspar dissolved pores, with proportion 42.7% and 42.2% respectively. The average pore radius is 157.1μm, the average throat radius is 0.52μm, and the average pore-throat radius ratio is 572.7.The nanoscale pore throats are dominated by slit-shaped pores, the specific surface area of pores is large with an average value 2.5731m2/g. Overall the pore throat is relatively fine and the separation is better, but the connectivity is poor, and the pore sizes range 25nm to 500nm.The size of pore throats is an important factor affecting reservoir physical properties, in which the size of throats is the main factor affecting seepage capacity. In general, large pore throats provide the main seepage channels for the reservoir, and the pore throat radius ratio also has a certain control on fluid seepage. |
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