彭小东,张 辉,汪新光,等. 乌石A砂砾岩油藏储层特征及综合评价[J]. 海洋地质前沿,2020,36(8):50-56. DOI: 10.16028/j.1009-2722.2019.152
    引用本文: 彭小东,张 辉,汪新光,等. 乌石A砂砾岩油藏储层特征及综合评价[J]. 海洋地质前沿,2020,36(8):50-56. DOI: 10.16028/j.1009-2722.2019.152
    PENG Xiaodong, ZHNAG Hui, WANG Xinguang, CHU Shasha, HUAN Jinlai, ZHAO Nan. CHARACTERISTICS OF WS-A GLUTENITE RESERVOIR AND ITS INTEGRATED EVALUATION[J]. Marine Geology Frontiers, 2020, 36(8): 50-56. DOI: 10.16028/j.1009-2722.2019.152
    Citation: PENG Xiaodong, ZHNAG Hui, WANG Xinguang, CHU Shasha, HUAN Jinlai, ZHAO Nan. CHARACTERISTICS OF WS-A GLUTENITE RESERVOIR AND ITS INTEGRATED EVALUATION[J]. Marine Geology Frontiers, 2020, 36(8): 50-56. DOI: 10.16028/j.1009-2722.2019.152

    乌石A砂砾岩油藏储层特征及综合评价

    CHARACTERISTICS OF WS-A GLUTENITE RESERVOIR AND ITS INTEGRATED EVALUATION

    • 摘要: 南海西部海域低渗原油地质储量大,有效动用率低,其中乌石A油田主要是砂砾岩储层,目前针对此类油藏的储层特征及综合评价研究较少,需要对乌石A油田的储层微观孔隙结构特征进行研究,明确其开发难易程度和开发潜力。选取乌石A油田具有代表性的岩样,开展了包括恒速压汞、核磁共振、非线性测试、黏土矿物分析、润湿性等多种物理模拟实验,系统地研究了乌石A油田的微观孔喉结构特征,建立了六元参数储层评价方法,对该油藏进行了综合评价。研究表明:乌石A低渗砂砾岩油田渗透率<1×10−3 μm2的储层综合分类系数<5,属于三类储层,开发难度大;渗透在(1~30)×10−3 μm2的储层综合分类系数<8,属于二类储层,开发难度较大;渗透率>30×10−3 μm2的储层综合分类系数>8,属于一类储层,开发难度小。

       

      Abstract: The low-permeability reservoirs are large in reserve in the western South China Sea, but the utilization rate is quite low up to date. The major payzone of WS-A oilfield is of glutenite type. So far, few studies have been contributed to the characteristics of glutenite reservoir and its integrated evaluation. It is necessary to carry out the study of the microscopic pore structures so as to determine the potential and the difficulties which may be encountered in oil and gas production and development. In this paper, we selected some representative rock samples from the WS-A oilfield, and had various physical simulation experiments, such as constant velocity mercury intrusion, nuclear magnetic resonance, nonlinear test, clay mineral analysis and wettability measurement. Based on the characteristics of the microscopic pore-throat structure of the reservoir, a integrated reservoir evaluation method on six-element parameters was established for reservoir evaluation. It is found that in the WS-A low permeability glutenite oilfield, if the integrated classification coefficient of reservoirs is less than 5 or the permeability is less than 1×10−3 μm2, it belongs to the third type of reservoir and is very difficult to develop indeed; if the integrated classification coefficient of reservoirs is between 5-8 or the permeability vary between 1-30×10−3 μm2, it belongs to the second type of reservoirs, which is difficult to develop; if the integrated classification coefficient of reservoirs is greater than 8 or the permeability greater than 30×10−3 μm2, it belongs to the first type of reservoirs, which is easy to develop.

       

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