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主办单位:煤炭科学研究总院有限公司、中国煤炭学会学术期刊工作委员会
鄂尔多斯盆地东缘临兴−神府区块深部煤层气富集规律与勘探对策
  • Title

    Enrichment patterns and exploration countermeasures of deep coalbed methane in the Linxing-Shenfu block on the eastern margin of the Ordos Basin

  • 作者

    徐长贵季洪泉王存武朱学申

  • Author

    XU Changgui;JI Hongquan;WANG Cunwu;ZHU Xueshen

  • 单位

    中国海洋石油集团有限公司中联煤层气公司有限责任公司中海油研究总院有限责任公司

  • Organization
    China National Offshore Oil Corporation
    China United Coalbed Methane Corporation Ltd.
    CNOOC Research Institute Ltd.
  • 摘要
    目的

    鄂尔多斯盆东缘以大宁−吉县区块为代表的高煤阶深部煤层气富集成藏规律已取得一定认识,但位于东缘北段的临兴−神府区块中煤阶深部煤层气勘探刚刚起步,富集成藏规律认识还不够准确清晰,需要总结其富集成藏规律有效指导深部煤层气开放。

    方法

    以临兴−神府区块太原组8+9号煤为研究对象,依据煤的烃源岩−储集层双重属性,开展了源储、生烃、赋存和富集控制因素及其耦合关系研究。

    结果和结论

    结果表明:(1)研究区具有东西分带性,分为东部断阶带和西部平缓带,主体埋深超过1 500 m。太原组8+9号煤层厚度大,微孔和宏孔发育,热演化程度中等、含气量整体较高,深部煤层气成藏条件优越,具备较大的资源勘探潜力。(2)研究区泥坪与分流间湾沉积微相煤层厚度大、镜质组含量高、煤层结构简单,随着热演化程度的增高,煤层含气量变大、气体中甲烷含量的占比显著增加,8+9号煤层温−压条件耦合控制的临界吸附带在1 750 m左右,泥岩良好的封盖性、稳定的构造环境和封闭的水动力条件是煤层气富集的重要保障。(3)针对研究区地质条件的差异性,平缓带的煤层气富集区应加快勘探节奏,围绕探明储量区扩大勘探,同时加强该区深部煤层可压性研究,推动规模建产;断阶带的煤层气富集区应开展试采评价,加强离石走滑断裂带的压扭、张扭过渡区研究,以期获得储量发现。研究成果系统总结了临兴−神府区块中煤阶深部煤层气富集成藏规律,指导了富集区的优选,对推动该区效益勘探与规模开发具有积极意义。

  • Abstract
    Objective

    Some insights have been gained into the enrichment and accumulation patterns of deep coalbed methane (CBM) in high-rank coal seams on the eastern margin of the Ordos Basin, represented by the Daning-Jixian block. However, the exploration of deep CBM in medium-rank coal seams in the Linxing-Shenfu block, located in the northern segment of the basin's eastern margin remains in its initial stage, leading to an inaccurate and unclear understanding of the enrichment and accumulation patterns. This necessitates summarizing these patterns to effectively guide deep CBM production.

    Method

    Focusing on the Nos.8 and 9 coal seams of the Taiyuan Formation in the Linxing-Shenfu block, this study investigated the factors controlling source rock - reservoir configuration, along with hydrocarbon generation, occurrence, and accumulation, and the coupling relationships between these factors based on the dual attributes of coals as both source rocks and reservoirs.

    Results and Conclusions

    Key findings are as follows: (1) The study area exhibits an east-west zoning, consisting of the eastern fault terrace zone and the western gentle zone, with the main body manifesting burial depths exceeding 1500 m. The Nos.8 and 9 coal seams of the Taiyuan Formation are considerably thick, contain micropores and macropores, and feature moderate maturity and a high gas content in general, suggesting superior accumulation conditions for deep CBM and great potential for resource exploration; (2) The coal seams formed under sedimentary microfacies of mudflats and interdistributary bays display substantial thicknesses, high vitrinite content, and simple structures. With an increase in maturity, these coal seams exhibit increasing gas content, specifically the methane content. The critical adsorption zone of the Nos.8 and 9 coal seams, under the coupled control of temperature-pressure conditions, shows a burial depth of around 1750 m. CBM enrichment is ensured by the high sealing performance of mudstones, stable tectonic environments, and closed hydrodynamic conditions; (3) Given the differences in geologic conditions of the study area, specific recommendations are proposed in this study. For the western gentle zone, it is necessary to accelerate the exploration of the CBM enrichment zone, expand the exploration around the area with proven reserves, and strengthen research on the compressibility of deep coal seams in the zone, with the purpose of driving large-scale production capacity construction. For the eastern fault terrace zone, it is advisable to conduct a pilot production assessment in the CBM enrichment zone and enhance the research on the transpressive-transtensional transition zone of the Lishi strike-slip fault zone, aiming to reveal new reserves. This study, systematically summarizing the enrichment and accumulation patterns of deep CBM in medium-rank coal seams of the Linxing-Shenfu block, has guided the selection of the optimal CBM accumulation zone, holding positive significance for the efficient exploration and large-scale exploitation of this block.

  • 关键词

    深部煤层气富集规律勘探对策临兴−神府区块

  • KeyWords

    deep coalbed methane;enrichment pattern;exploration strategy;Linxing-Shenfu block

  • 基金项目(Foundation)
    中海油十四五重大专项(KJGG2022-1001)
  • DOI
  • 引用格式
    徐长贵,季洪泉,王存武,等. 鄂尔多斯盆地东缘临兴−神府区块深部煤层气富集规律与勘探对策[J]. 煤田地质与勘探,2024,52(8):1−12. DOI: 10.12363/issn.1001-1986.24.01.0026
  • Citation
    XU Changgui,JI Hongquan,WANG Cunwu,et al. Enrichment patterns and exploration countermeasures of deep coalbed methane in the Linxing-Shenfu block on the eastern margin of the Ordos Basin[J]. Coal Geology & Exploration,2024,52(8):1−12. DOI: 10.12363/issn.1001-1986.24.01.0026
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  • 图表
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    • 临兴−神府区块位置与地层综合柱状

    图(13) / 表(2)

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