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首页> 外文期刊>Interpretation >Pore structure characteristics and its effect on adsorption capacity of Niutitang marine shale in Sangzhi block, southern China
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Pore structure characteristics and its effect on adsorption capacity of Niutitang marine shale in Sangzhi block, southern China

机译：孔隙结构特征及其对南方桑智街尼蒂伊塘海洋页岩吸附能力的影响

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摘要

Charin teristies of shale pore structures may play an important role in natural gas accumulation and consequently estimating the original gas in place. To determine the pore structure characteristics of Niutitang marine shale in the Sangzhi block, we carried out N-2 adsorption-desorption (LP-N(2)GA), CO2 adsorption (LP-N(2)GA), and methane isothermal adsorption on shale samples to reveal the pore size distribution (PSD) and its impact on the adsorption capacity. Results indicate that the Niutitang Shale is in stages of maturity and overmaturity with good organic matter, and they also indicate well-developed interparticle, intraparticle, and organic pores. Quartz and clay are found to be the main minerals, and the high illite content means that the Niutitang Shale is experiencing the later stage of clay mineral transformation. Various-sized shale pores are well-developed, and most of them are narrow and slit-like. For pores with diameters of 2-300 nm measured with LP-N(2)GA, mesopores (2-50 nm) contribute most of the total specific surface area (SSA) and total pore volume (TPV) in comparison to macropores (50-300 nm). For micropores (<2 nm) tested by LP-N(2)GA, the PSD appears to be multimodal; shale pores of 0.50-0.90 nm diameter contribute most of the SSA and TPV. CO2-SSA and N-2-SSA indicate positive correlations with their corresponding TPV. The total organic matter (TOC) has good correlation with the SSA and TPV of micropores. The Langmuir volume positively correlates with the total SSA. Additionally, the TOC content has a good correlation with the Langmuir volume, which is consistent with the observation of well-developed fossils of diatoms and organic pores. As an important source of organic more diatoms mean more organic matter, larger TOC values and quartz content, larger SSA and TPV of micropores, and, of course, stronger shale adsorption capacity. The results provide important guidance for the exploration and development of shale gas existing in the Sangzhi block.
机译：Shale孔隙结构的夏洛丛书可能在天然气积累中发挥重要作用，从而估计原始气体到位。为了确定Sangzhi嵌段中尼氏阳船页岩的孔结构特征，我们进行了N-2吸附 - 解吸（LP-N（2）Ga），CO 2吸附（LP-N（2）Ga）和甲烷等温吸附在页岩样品上透露孔径分布（PSD）及其对吸附能力的影响。结果表明，NiutiItang页岩与良好的有机物有成熟度和过度饱和度，并且它们还表明良好开发的颗粒，骨质和有机孔隙。发现石英和粘土是主要的矿物质，高伊利石内容意味着Niutitang Shale正在经历粘土矿物转化的后期阶段。各种尺寸的页岩孔隙是发达的，大多数是狭窄的狭缝般的。对于用LP-N（2）Ga测量的直径为2-300nm的孔，与大孔（50个-300 nm）。对于通过LP-N（2）Ga测试的微孔（<2nm），PSD似乎是多式联的; 0.50-0.90 nm直径的页岩毛孔有贡献大部分SSA和TPV。 CO2-SSA和N-2-SSA表示与相应TPV的正相关。总有机物质（TOC）与微孔的SSA和TPV具有良好的相关性。 Langmuir体积与总SSA呈正相关。另外，TOC含量与Langmuir体积具有良好的相关性，这与观察硅藻和有机孔的良好发育化石的观察一致。作为有机物的重要来源，硅藻意味着更多的有机质，较大的TOC值和石英含量，较大的SSA和微孔的TPV，以及较强的页岩吸附能力。结果为桑珠块现有的页岩气勘探和开发提供了重要指导。

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  • 来源
    《Interpretation》 |2019年第4期|共14页
  • 作者

    Wang Xinghua; Taleghani Arash Dahi; Ding Wenlong;

  • 作者单位

    China Univ Geosci Beijing Sch Energy Resources Beijing 100083 Peoples R China;

    Penn State Univ John &

    Willie Leone Family Dept Energy &

    Mineral State Coll PA 16802 USA;

    China Univ Geosci Beijing Sch Energy Resources Beijing 100083 Peoples R China;

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  • 正文语种 eng
  • 中图分类 地球物理学;
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