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阿尔及利亚X区块三叠系的主要目的层段是TAGI组,它属于典型的低幅圈闭油气藏,其储层类型为河流相的砂岩储层。在新完钻的两口井中均钻遇了低阻油层,其成因十分复杂,油水识别比较困难。本文基于低阻油层的测井曲线响应特征,深入分析了该区低阻油层的成因,主要为高地层水矿化度、双重孔隙系统并存、泥质含量重及砂泥岩薄互层的影响。在此基础之上,建立了基于岩心分析、成像测井和电缆测压资料的低阻油层饱和度的计算模型,能准确计算研究靶区低阻油层的饱和度,为海外油气储量的准确评估奠定了坚实的基础。
The main target zone of the Triassic in the X block of Algeria is the TAGI Formation, which belongs to the typical low-amplitude trap oil and gas reservoirs. Its reservoir type is fluvial sandstone reservoirs. Low-resistivity reservoirs have been encountered in both newly drilled wells, and their causes are complex and oil-water identification is more difficult. Based on the logging response characteristics of low resistivity reservoirs, this paper analyzes the genesis of the low resistivity reservoirs in this area, mainly including the influence of the high formation water salinity, the coexistence of dual porosity systems, the heavy mud content and the thin interbed of sand and shale. On this basis, the calculation model of low resistivity reservoir saturation based on core analysis, imaging logging and cable manometry data is established, which can accurately calculate the saturation of low resistivity reservoir in the target area and accurately estimate the overseas oil and gas reserves Laid a solid foundation.