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首页> 外文期刊>Fuel >Characterizations of pore, mineral and petrographic properties of marine shale using multiple techniques and their implications on gas storage capability for Sichuan Longmaxi gas shale field in China
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Characterizations of pore, mineral and petrographic properties of marine shale using multiple techniques and their implications on gas storage capability for Sichuan Longmaxi gas shale field in China

机译：利用多种技术表征海相页岩的孔隙，矿物和岩石学特征及其对中国四川龙马溪气页岩气田储气能力的影响

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摘要

Pore, mineral and petrographic properties of shale conjunctionally determine the gas storage and transport properties of gas shale reservoirs. To investigate how these characteristics and pore structure influence the methane adsorption capability of shale formation, a total of forty-nine over-matured shale outcrop samples, thirty samples from Upper Longmaxi Formation and nineteen samples from Lower Longmaxi Formation from southern Sichuan Basin in China, were collected. Multiple techniques, including geochemical and mineralogical measurements, field emission-scanning electron microscopy (FE-SEM), mercury intrusion porosimetry (MIP), low-pressure CO2 and N-2 adsorption and high-pressure methane adsorption, were employed to characterize the geo-properties, pore structure and their impacts on methane adsorption capacity under different temperatures. Geochemical and mineralogical results show that both Upper and Lower Longmaxi shales are over-matured which have oil-prone type I kerogen. Based on the FE-SEM observation, most of the organic matter (OM) pores in the tested Longmaxi shales are spongy OM pores due to the over-maturity stage with R-o between 2.36% and 3.15%. In general, Lower Longmaxi shales are rich in micropores with larger pore volume and specific surface area (SSA) compared to those of the Upper ones. A combination of CO2/N-2 adsorption and MIP analyses on the pore structure show a whole-aperture pore size distribution (PSD) ranging from 0.4 nm to 10 mu m. The methane adsorption capacity increases with increasing TOC for Lower and Upper Longmaxi shales, respectively, while increases with increasing SSA for combined Lower and Upper ones. It is noted that, the numerous OM pores in Lower Longmaxi shale are the primary contribution to a better pore network and greater methane adsorption capacities compared to that of the Upper Longmaxi shale, but it all depends on the surface area. Shale samples with higher surface area have higher methane adsorption capacity no matter which Longmaxi shale Formations. In addition, temperature has an apparently negative effect on methane adsorption capacity for both Upper and Lower Longmaxi shales, where temperature is more sensitive to the shale sample with higher TOC content.
机译：页岩的孔隙，矿物和岩石学性质共同决定了页岩气藏的储气与输运性质。为了研究这些特征和孔隙结构如何影响页岩形成对甲烷的吸附能力，共计49个来自中国四川盆地南部的超成熟页岩露头样品，30个上龙马溪组样品和19个下龙马溪组样品，被收集。地球化学和矿物学测量，场发射扫描电子显微镜（FE-SEM），压汞法（MIP），低压CO2和N-2吸附以及高压甲烷吸附等多种技术用于表征地质性质，孔隙结构及其对不同温度下甲烷吸附能力的影响。地球化学和矿物学研究结果表明，上，下朗马西页岩均过熟，具有易发油的I型干酪根。根据FE-SEM观察，由于过熟阶段，R-o在2.36％至3.15％之间，测试过的Longmaxi页岩中的大多数有机质（OM）孔都是海绵状OM孔。通常，与上层的相比，下龙马溪组页岩富含微孔，具有较大的孔体积和比表面积（SSA）。 CO2 / N-2吸附和MIP分析相结合的孔隙结构显示全孔径孔径分布（PSD）为0.4 nm至10μm。下部和上部Longmaxi页岩的甲烷吸附能力分别随着TOC的增加而增加，而下部和上部组合页岩的甲烷吸附能力则随着SSA的增加而增加。值得注意的是，与上龙马溪组页岩相比，下龙马溪组页岩中大量的OM孔是对更好的孔隙网络和更大的甲烷吸附能力的主要贡献，但这全都取决于表面积。无论哪种龙马溪组页岩层，具有较高表面积的页岩样品均具有较高的甲烷吸附能力。另外，温度对Longmaxi上部和下部页岩的甲烷吸附能力有明显的负面影响，在这种情况下，温度对TOC含量较高的页岩样品更敏感。

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  • 来源
    《Fuel》 |2019年第1期|360-371|共12页
  • 作者

    Xu Hao; Zhou Wen; Zhang Rui; Liu Shimin; Zhou Qiumei;

  • 作者单位

    Chengdu Univ Technol State Key Lab Oil & Gas Reservoir Geol & Exploita Chengdu 610059 Sichuan Peoples R China|Penn State Univ Dept Energy & Mineral Engn G3 Ctr University Pk PA 16802 USA|Penn State Univ Energy Inst University Pk PA 16802 USA;

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

    Penn State Univ Dept Energy & Mineral Engn G3 Ctr University Pk PA 16802 USA|Penn State Univ Energy Inst University Pk PA 16802 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Marine shale; Pore structure; Mineral content; Gas storage capacity; Upper and Lower Longmaxi formations; Temperature effect;

    机译：海洋页岩孔结构;矿物质含量;储气量;上部和下部Longmaxi地层;温度效应;

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