Nanopore Structure and Origin of Lower Permian Transitional Shale, Eastern Ordos Basin, China.
Nanopore Structure and Origin of Lower Permian Transitional Shale, Eastern Ordos Basin, China.
复制标题
DOI：
10.1021/acsomega.1c06568
复制
发表时间：
2022-03-01
期刊：
影响因子：
4.1
通讯作者：
Wei G
中科院分区：
文献类型：
--
作者：
Song D;Qiao Y;Liu W;Zhang X;Yu Z;Wei G
页岩纳米孔隙在甲烷吸附中发挥着至关重要的作用，其结构特征和起源对于揭示甲烷吸附、解吸和扩散机制具有重要意义。本文通过低温灰化和低压气体吸附实验，定量表征了原始页岩和灰化页岩的纳米孔隙结构，并对鄂尔多斯盆地东部下二叠统过渡页岩纳米孔隙成因进行了分析。结果表明，过渡型页岩储层纳米孔的孔体积（PV）和比表面积（SSA）分别为0.0217~0.0449 cm3/g和13.91~51.20 m2/g。微孔（<2 nm）、中孔（2~50 nm）、大孔（50~100 nm）对PV的平均贡献率分别为18.78、72.26和8.96%，对SSA的平均贡献率分别为66.19、33.10和0.71%。此外，还发现无机矿物和有机质对微孔SSA的平均贡献率分别为55.9%和44.1%，对介孔SSA的平均贡献率分别为92.3%和7.7%。结合页岩中主要粘土矿物和干酪根的吸附特性，认为过渡型页岩中有机质孔隙对甲烷的吸附具有绝对优势。阐明多尺度孔隙的成因对于理解页岩中甲烷的赋存、解吸和扩散机制具有重要意义。
Nanopores in the shale play a vital role in methane adsorption, and their structural characteristics and origins are of great significance for revealing the mechanism of methane adsorption, desorption, and diffusion. In this paper, through low-temperature ashing and low-pressure gas adsorption experiments, the nanopore structure of original shales and ashed shales was quantitatively characterized, and the nanopore origins in the transitional shale of lower Permian in eastern Ordos Basin were analyzed. The results show that the pore volume (PV) and specific surface area (SSA) of nanopores in transitional shale reservoirs are 0.0217–0.0449 cm3/g and 13.91–51.20 m2/g, respectively. The average contribution rates of micropores (<2 nm), mesopores (2–50 nm), and macropores (50–100 nm) to PV are 18.78, 72.26, and 8.96%, respectively, and the average contribution rates to SSA are 66.19, 33.10, and 0.71%, respectively. In addition, it is found that the average contribution rates of inorganic minerals and organic matter to the SSA of micropores are 55.9 and 44.1%, respectively, and the average contribution rates to the SSA of mesopores are 92.3 and 7.7%, respectively. Combining the adsorption properties of the main clay minerals and kerogen in shale, it is concluded that organic pores control the adsorption of methane with an absolute advantage in transitional shales. It is of great significance to understand the mechanism of methane occurrence, desorption, and diffusion in shales by clarifying the origins of multiscale pores.
登录
查看更多内容
有机质对成熟湖相富有机质页岩孔隙结构的影响——以鄂尔多斯盆地三叠系延长页岩为例
影响因子：
7.4
作者：
Li, Jing;Zhou, Shixin;Li, Chengcheng
通讯作者：
Li, Chengcheng
影响因子：
3.5
作者：
Bowker, Kent A.
通讯作者：
Bowker, Kent A.
影响因子：
5.6
作者：
Li, Jing;Zhou, Shixin;Zhang, Yuhong
通讯作者：
Zhang, Yuhong
影响因子：
--
作者：
Deng Hucheng;Fu Meiyan;Wang Dailun
通讯作者：
Wang Dailun
影响因子：
7.4
作者：
Clarkson, C. R.;Solano, N.;Blach, T. P.
通讯作者：
Blach, T. P.