Abstract Nano-scale pores play an important role in determining the adsorption capacity of shale gas. To quantitatively evaluate the pore size distributions contributed by organic matter (OM), clay and other minerals in an over-mature shale reservoir, the Lower Silurian Longmaxi shale from Southeast Chongqing was selected as a case study and was analyzed by the pore size distributions contributed by OM, clay and other minerals (PSDCOCO) method. Based on the results of total organic carbon (TOC), carbon element content in OM, X-ray diffraction (XRD) and low temperature nitrogen adsorption/desorption (LTNA) experiments, the pore size distributions contributed by a unit mass of OM, clay and other minerals were calculated and the differences between the results of the LTNA and PSDCOCO methods were determined for the four verified samples. The average value of the difference between the experimental and calculated pore volumes is 0.154 × 10−3 cm3/g. For the Longmaxi shale from the Py1 well, the contributions of OM and other minerals to the pore volume (pore width

中文翻译：

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过成熟海相页岩中有机质、黏土等矿物贡献的孔径分布——以重庆东南龙马溪页岩为例

摘要 纳米级孔隙在决定页岩气的吸附能力方面起着重要作用。为定量评价过成熟页岩储层中有机质、黏土和其他矿物贡献的孔径分布，以重庆东南部下志留统龙马溪页岩为例，对其贡献的孔径分布进行了分析。通过OM、粘土和其他矿物（PSDCOCO）方法。基于总有机碳 (TOC)、OM 中碳元素含量、X 射线衍射 (XRD) 和低温氮吸附/解吸 (LTNA) 实验的结果，单位质量的 OM、粘土贡献的孔径分布计算了 LTNA 和 PSDCOCO 方法的结果之间的差异，并对四个验证样品进行了计算。实验孔体积与计算孔体积之差的平均值为 0.154 × 10-3 cm3/g。对于 Py1 井龙马溪页岩，OM 和其他矿物对孔隙体积（孔隙宽度）的贡献