| 湖相混积岩储层孔喉组合特征多尺度表征及评价 |
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| 引用本文： | 万琳,代黎明,汤国民,郝轶伟,高曦龙.湖相混积岩储层孔喉组合特征多尺度表征及评价[J].地球科学,2020,45(10):3841-3852. |
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| 作者姓名： | 万琳 代黎明 汤国民 郝轶伟 高曦龙 |
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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, 天津 300459 |
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| 基金项目： | 国家科技重大专项2016ZX05024-003 |
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| 摘 要： | 以渤海海域石臼坨凸起陡坡带沙河街组混积岩储层为研究对象，利用高压压汞、二维大面积背散射扫描电镜成像技术（Maps）、矿物成分定量分析技术（QEMSCAN）及微米CT等实验手段，对研究区沙河街组湖相混积岩储集空间的宏观特征到微观特征、二维平面特征到三维空间特征、微米级到亚微米级的孔喉分布特征进行多尺度的定量表征.结合孔喉分形特征，对研究区沙河街组湖相混积岩储层孔喉结构进行了分类评价.研究结果表明:研究区湖相混积岩储层岩石类型多样，非均性质强，孔喉结构复杂.毫米-微米级孔喉网络主要发育在高孔、中-高渗的亮晶生屑云岩中，溶蚀孔、生物体腔孔是其重要的储集空间类型，孔喉分形维数最低；亚微米-微米级、微米级孔喉主要发育在中-高孔、中-低渗的云质生屑砂岩、陆屑白云岩等岩性中，主要储集空间类型为粒间溶孔、铸模孔、晶间孔等，孔喉分形维数中等；纳米-亚微米级孔喉主要分布在泥晶砂屑云岩、钙质粉砂岩中，晶间孔是其主要的储集空间类型，孔喉分形维数最高.湖相混积岩储层孔喉组合特征多尺度表征及评价为渤海海域混积岩储层流体识别和有效开发提供了依据.
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| 关 键 词： | 湖相混积岩 孔喉组合 分形评价 沙河街组 渤海海域 沉积 |
| 收稿时间： | 2020-03-06 |
Multi-Scale Characterization and Evaluation of Pore-Throat Combination Characteristics of Lacustrine Mixed Rock Reservoir |
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| Abstract: | In this study, it investigates the mixed rock reservoir of the Shahejie Formation in the steep slope of the Shijiutuo uplift in the Bohai Sea area. Through high-pressure mercury injection, two-dimensional large area back scattering scanning electron microscope imaging technology (Maps), mineral composition quantitative analysis technology (QEMSCAN) and micron CT and other experimental methods, the macro-to-micro, two-dimensional plane characteristics to three dimensional spatial characteristics and pore-throat distribution characteristics from micron to submicron in lacustrine mixed rock reservoir space of Shahejie Formation in the study area are quantitatively characterized by multi-scale analyses. According to the fractal characteristics of the pore-throat, the evaluation of the pore-throat structure of the mixed rock in the Shahejie Formation in the study area is established. The results reveal various rock types, strong heterogeneous properties and complex pore-throat structure in the lacustrine mixed rock reservoir in the study area. The millimeter-micron pore-throat network is mainly developed in high porosity, medium to high permeability bright crystalline dandruff dolomite. Dissolution pores and biological cavity holes contribute greatly to the expansion of reservoir space, the fractal dimension of pore-throat is the lowest. Submicron-micron and micron pore-throat is mainly developed in medium-high porosity, medium-low permeability dolomitic lithogenic sandstone and continental dolomite. The main storage space types are inter-granular dissolved pore, mold hole, inter-crystalline pore and so on. The pore-throat fractal dimension is medium. The pore-throat of nanometer-submicron is mainly distributed in mud crystal sand dolomite and calcareous siltstone. Inter-granular pores and micro-cracks are the main types of reservoir space. The fractal dimension of the pore throat is the highest. Multi-scale characterization and evaluation of pore-throat combination characteristics of lacustrine mixed rock reservoir provide basis for fluid identification and effective development of mixed rock reservoirs in Bohai Sea area. |
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