济阳坳陷页岩油储层矿物组分最优化反演方法

针对页岩油储层矿物组分复杂多样、矿物体积含量模型不统一、矿物组分准确定量评价困难等问题,以济阳坳陷陆相页岩油储层的岩心X衍射全岩矿物岩心分析和薄片鉴定等实验资料为基础,引入有机骨架,构建页岩油储层“双骨架”矿物组分岩石物理体积模型,在经过储层三孔隙度校正之后,采用最小二乘法-奇异值分解最优化反演方法计算页岩油储层有机骨架和无机骨架矿物组分体积含量。研究表明,采用最优化反演方法计算得到的矿物体积含量与X衍射测量结果相关性达到0.60以上,并在实际井中得到验证应用。研究成果可为页岩油储层精细评价提供有力支撑。

Optimal Retrieval Method for Mineral Constituents of Shale Oil Reservoirs in Jiyang Sag

To address the problems of complex and diverse mineral constituents in shale oil reservoirs, inconsistent mineral volume and content models, and difficulties in accurate quantitative evaluation of mineral constituents, the organic framework was introduced to build a petrophysical volume model of "dual-framework" mineral constituents in shale oil reservoirs based on the experimental data of core analysis by X-ray diffraction on all minerals in the rock and thin slice identification of continental shale oil reservoirs in Jiyang Sag, and the optimal retrieval method with least-squares and singular value decomposition was used to calculate the volume and content of mineral constituents of organic and inorganic framework in shale oil reservoirs after the correction of reservoir triple porosity. The research shows that the correlation between the mineral volume content calculated by the optimal inversion method and the X-ray diffraction measurement results is more than 0.60, which has been verified and applied in actual wells. The study results provide strong support for the accurate evaluation of shale oil reservoirs.