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首页> 外文期刊>Fuel >Evaluation of gas contents for a multi-seam deep coalbed methane reservoir and their geological controls: In situ direct method versus indirect method
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Evaluation of gas contents for a multi-seam deep coalbed methane reservoir and their geological controls: In situ direct method versus indirect method

机译：多煤层深层煤层气储层含气量评价及其地质控制：原位直接法与间接法

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摘要

Gas content is one of the most important parameters determining the potential resources and recovery of coalbed methane (CBM). Extensive field work has been conducted for a perspective CBM field in Qinshui Basin with multi-targeted producing coal seams. The gas content was estimated by both direct and indirect methods based on the canister desorption results and methane sorption isotherms. Within the studied CBM field, coal seams are well developed at greater burial depth (>1000 m). The #2, #3, #8, #12, and #15 coal seams in Shanxi and Taiyuan formations are the primary and targeted CBM producing formations. By applying the USBM direct method, the in situ gas contents of the main coal seams are then estimated from the analysis of desorption data. It was found that the indirect method depending on sorption isotherm overestimate the gas content in the studied field because it assumes the gas saturated CBM formation. We found that the coal seams are primarily undersaturated and located under CBM weathered and oxidized zone (CH4 > 90%) with good preservation conditions. The in situ gas contents of the #2, #3, #8, #12, and #15 coals range from 5.62 to 19.36 cm3/g, 11.84 to 31.24 cm(3)/g, 2.96 to 29.28 cm(3)/g, 10.96 to 31.19 cm(3)/g, and 7.91 to 27.32 cm(3)/g, respectively, with increase trends from the marginal to central areas for all tested seams. Coalification directly determines gas adsorption capacity and it significantly influences the in situ gas content. Coupled contributions of higher gas adsorption capacity and reservoirs pressure lead to higher gas content occur at depth between 1300 and 1550 m. Moreover, high in situ gas content is always associated with roof lithologies with stronger sealing capacity. However, normal faults and groundwater recharge area could promote gas release from the coals. Thus, the internal area of Block II with poor faults development and weak groundwater runoff is a target area for deep CBM preservation.
机译：气体含量是确定潜在资源和煤层气（CBM）采收率的最重要参数之一。沁水盆地一个多目标采煤层的煤层气透视田进行了广泛的田间工作。基于罐的解吸结果和甲烷吸附等温线，可通过直接和间接方法估算气体含量。在所研究的煤层气田中，煤层在更大的埋深（> 1000 m）内发育良好。山西和太原地层中的＃2，＃3，＃8，＃12和＃15煤层是主要和目标煤层气生产地层。通过应用USBM直接方法，然后根据解吸数据分析估算主要煤层的原位气体含量。已经发现，依赖吸附等温线的间接方法高估了所研究领域中的气体含量，因为它假定了气体饱和煤层气的形成。我们发现煤层主要是不饱和的，并且位于具有良好保存条件的煤层气风化和氧化带（CH4> 90％）下。 ＃2，＃3，＃8，＃12和＃15煤的原位气体含量范围为5.62至19.36 cm3 / g，11.84至31.24 cm（3）/g、2.96至29.28 cm（3）/ g，10.96至31.19 cm（3）/ g和7.91至27.32 cm（3）/ g，对于所有测试接缝，从边缘到中心区域都有增加的趋势。煤化作用直接决定了气体的吸附能力，它会显着影响原位气体含量。较高的气体吸附能力和储层压力的共同作用导致深度在1300至1550 m之间发生较高的含气量。此外，高原位气体含量总是与具有更强密封能力的屋顶岩性有关。但是，正常的断层和地下水补给区可能会促进煤中瓦斯的释放。因此，断层发育不良，地下水径流较弱的Ⅱ区内部区域是深层煤层气保存的目标区域。

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  • 来源
    《Fuel》 |2020年第1期|116917.1-116917.17|共17页
  • 作者

  • 作者单位

    China Univ Min & Technol Coalbed Methane Resources & Reservoir Format Proc Minist Educ Xuzhou 221008 Jiangsu Peoples R China|China Univ Min & Technol Sch Resources & Geosci Xuzhou 221116 Jiangsu Peoples R China|Penn State Univ G3 Ctr Dept Energy & Mineral Engn University Pk PA 16802 USA|Penn State Univ Energy Inst University Pk PA 16802 USA;

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

    China Univ Min & Technol Coalbed Methane Resources & Reservoir Format Proc Minist Educ Xuzhou 221008 Jiangsu Peoples R China|China Univ Min & Technol Sch Resources & Geosci Xuzhou 221116 Jiangsu Peoples R China;

  • 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

    Deep CBM; Direct and indirect methods; Gas content; Geological controls;

    机译：深层煤层气;直接和间接方法;气体含量;地质控制;

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