海陆过渡相煤系页岩气储层压汞孔隙特征

发布时间：2018-09-14 16:57

【摘要】：煤系"三气"受到广泛关注,开展煤系页岩气储层孔隙特征研究具有基础意义。运用压汞法测定淮南煤田海陆过渡相煤系地层页岩气储层孔隙特征,研究结果表明,研究区煤系泥岩矿物含量以黏土矿物和石英为主,压汞曲线反映出3类孔隙形貌,总体连通性较好。页岩压汞孔隙体积在0.003 7~0.020 1 cm~3/g之间,平均为0.010 07 cm~3/g。总孔比表面积为0.425~7.074 m~2/g之间,平均为3.752 m~2/g。与中国南方龙马溪组、牛蹄塘组相比,孔容贡献均来自微孔和过渡孔,具有一致性,孔比表面积介于龙马溪组测试数据高、低值之间,孔容稍低于牛蹄塘组,但高于龙马溪组测试低值。基于Menger海绵模型计算得到的分形维数与平均孔径、比表面积与孔隙度具有一定统计学关系,将其视为表征储层物性的一个有效指标,具有一定实际意义。
[Abstract]:The study of pore characteristics of coal shale gas reservoir is of fundamental significance. The pore characteristics of shale gas reservoirs in transitional coal series strata of sea and land facies in Huainan coalfield were determined by mercury injection method. The results show that the mineral content of mudstone in coal measures in the study area is mainly clay and quartz, and the mercury injection curve reflects three kinds of pore morphology. Overall connectivity is good. The pore volume of shale mercury pressure is between 0. 0.003 and 0. 0201 cm~3/g, with an average of 0.010 07 cm~3/g.. The specific surface area of the total pore is between 0.425 and 7.074 mg, with an average of 3.752 mm2 / g. Compared with the Longmaxi formation and Niulitang formation in southern China, the contribution of pore volume came from micropore and transition pore, and the pore specific surface area was between high and low values of Longmaxi formation, and the pore volume was slightly lower than that of Niulitang formation. But it was higher than the low value of Longmaxi group. The fractal dimension and average pore size, specific surface area and porosity calculated by Menger sponge model are statistically related to each other, which is regarded as an effective index to characterize reservoir physical properties and has certain practical significance.
【作者单位】：安徽理工大学地球与环境学院;安徽省煤田地质局;
【基金】：国家自然科学基金(41402140,41330638,41302129) 安徽省页岩气资源调查评价项目(2012-g-17)资助
【分类号】：TE311

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