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首页> 外文期刊>Energy & fuels >Characterization and Evolution of Nanoporosity in Superdeeply Buried Shales: A Case Study of the Longmaxi and Qiongzhusi Shales from MS Well #1, North Sichuan Basin, China
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Characterization and Evolution of Nanoporosity in Superdeeply Buried Shales: A Case Study of the Longmaxi and Qiongzhusi Shales from MS Well #1, North Sichuan Basin, China

机译：超深埋页岩中纳米孔隙的特征与演化-以四川盆地北部MS井1号龙马溪组和琼竹寺组页岩为例

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摘要

The nanopore characteristics of shale samples from the superdeeply buried Longmaxi Shale (drillcore recovered from 6604-6920 m below ground level), Wufeng Shale (6920-6926 m), and Qiongzhusi Shale (7960-8044 m) were studied from MS Well #1, Sichuan Province, China, which was completed in March 2016 and is the deepest onshore well yet drilled in Asia. To gain a better understanding, of the influence of burial depth on the pore system of shales and to aid in the study of nanopore characteristics, the samples were analyzed by FESEM and N-2 gas adsorption. Samples of Sichuan Basin shales recovered from depths ranging from 0 to 5000 m were selected as a control group. The results show similar nanopore characteristics in all 32 superdeeply buried shale samples from the three formations. The dominant pore types in the superdeeply buried shales are organic matter pores and interparticle pores, along with minor intraparticle pores. The dominant pore morphology is slit-like in shape. Low-pressure N-2 adsorption analysis shows that the isotherms of all samples are type IV with an H3 hysteresis pattern. The quenched solid density functional theory (QSDFT) pore size distribution is dominantly in the range of 4-16 nm, and the BET surface area ranges between 8.63 and 16.13 m(2)/g. In comparison with nonsuperdeeply buried shales, superdeeply buried shales in MS Well #1 have a more dispersed pore-size distribution, lower micropore volume and micropore surface area, and higher mesopore volume and mesopore surface area. Thus, the mesopore/micropore volume and mesopore/micropore surface area ratios of the superdeeply buried shales are several orders of magnitude higher than those of the nonsuperdeeply buried shales. Compaction related to burial depth may compress the pores to reduce the pore sizes and change the pore shapes from round or elliptical-shaped to slit-shaped. Given their relatively small pore sizes, micropores are most easily destroyed during the superdeep burial stage.
机译：在MS＃井中研究了超深埋龙马溪组页岩（钻头从地下6604-6920 m回收），五峰页岩（6920-6926 m）和琼竹寺页岩（7960-8044 m）的页岩样品的纳米孔特征。中国的四川省，于2016年3月完工，是亚洲迄今最深的陆上钻井。为了更好地了解埋藏深度对页岩孔隙系统的影响并帮助研究纳米孔特征，通过FESEM和N-2气体吸附对样品进行了分析。选择0〜5000m深度的四川盆地页岩样品作为对照组。结果显示，来自三个地层的所有32个超深埋页岩样品均具有相似的纳米孔特征。在超深埋的页岩中，主要的孔隙类型是有机质孔隙和颗粒间孔隙，以及次要的颗粒内孔隙。主要的孔形态为狭缝状。低压N-2吸附分析表明，所有样品的等温线均为IV型，具有H3滞后模式。淬火的固体密度泛函理论（QSDFT）孔径分布主要在4-16 nm之间，且BET表面积在8.63和16.13 m（2）/ g之间。与非超深埋页岩相比，MS井＃1中的超深埋页岩具有更分散的孔径分布，较低的微孔体积和微孔表面积以及较高的中孔体积和中孔表面积。因此，超深埋页岩的中孔/微孔体积和中孔/微孔表面积比比非深埋页岩的中孔/微孔体积比高几个数量级。与埋藏深度有关的压实可压缩孔以减小孔尺寸并将孔形状从圆形或椭圆形改变为狭缝形。鉴于其相对较小的孔径，在超深埋葬阶段最容易破坏微孔。

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  • 来源
    《Energy & fuels》 |2018年第1期|191-203|共13页
  • 作者

    Jiao Kun; Ye Yuehao; Liu Shugen; Ran Bo; Deng Bin; Li Zhiwu; Li Jinxi; Yong Ziquan; Sun Wei;

  • 作者单位

    Chengdu Univ Technol, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610059, Sichuan, Peoples R China;

    Chengdu Univ Technol, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610059, Sichuan, Peoples R China;

    Chengdu Univ Technol, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610059, Sichuan, Peoples R China;

    Chengdu Univ Technol, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610059, Sichuan, Peoples R China;

    Chengdu Univ Technol, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610059, Sichuan, Peoples R China;

    Chengdu Univ Technol, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610059, Sichuan, Peoples R China;

    Chengdu Univ Technol, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610059, Sichuan, Peoples R China;

    Chengdu Univ Technol, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610059, Sichuan, Peoples R China;

    Chengdu Univ Technol, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610059, Sichuan, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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