Distribution Patterns and Controlling Factors of Different Phases of the Deep Coalbed Methane (CBM) within the Dacheng Uplift, Jizhong Depression

Zhu Jieqiong; Pu Longchuan; Gu Qiang; Wang Xiaoming; Xiao Yang; Dou Lianbin; Shi Guanzhong; Zhang Jichao; Wang Lei

doi:10.3799/dqkx.2025.209

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Distribution Patterns and Controlling Factors of Different Phases of the Deep Coalbed Methane (CBM) within the Dacheng Uplift, Jizhong Depression

更新时间：2026-10-15

- Distribution Patterns and Controlling Factors of Different Phases of the Deep Coalbed Methane (CBM) within the Dacheng Uplift, Jizhong Depression
- Earth Science Vol. 51, Issue 9, Pages: 3562-3577(2026)
- 作者机构：
  
  1.中国石油华北油田公司，河北任丘 062552
  2.中国石油华北油田公司勘探事业部，河北任丘 062552
  3.中国石油华北油田公司勘探开发研究院，河北任丘 062552
  4.中国地质大学（武汉）资源学院，湖北武汉 430074
  5.中国石油华北油田公司勘探事业部，河北任丘 062552
- 作者简介：
- 基金信息：
- DOI：10.3799/dqkx.2025.209
  CLC： P618.13
- Received：17 June 2025，
  
  Published：30 September 2026
- 稿件说明：
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朱洁琼，蒲龙川，古强，王小明，肖阳，窦连彬，史冠中，张霁潮，王磊，2026.冀中坳陷大城凸起深部煤层气不同相态分布规律及控制因素.地球科学，51（9）：3562-3577.

Zhu Jieqiong，Pu Longchuan，Gu Qiang，Wang Xiaoming，Xiao Yang，Dou Lianbin，Shi Guanzhong，Zhang Jichao，Wang Lei，2026.Distribution Patterns and Controlling Factors of Different Phases of the Deep Coalbed Methane （CBM） within the Dacheng Uplift， Jizhong Depression.Earth Science，51（9）：3562-3577.
朱洁琼，蒲龙川，古强，王小明，肖阳，窦连彬，史冠中，张霁潮，王磊，2026.冀中坳陷大城凸起深部煤层气不同相态分布规律及控制因素.地球科学，51（9）：3562-3577. DOI： 10.3799/dqkx.2025.209.

Zhu Jieqiong，Pu Longchuan，Gu Qiang，Wang Xiaoming，Xiao Yang，Dou Lianbin，Shi Guanzhong，Zhang Jichao，Wang Lei，2026.Distribution Patterns and Controlling Factors of Different Phases of the Deep Coalbed Methane （CBM） within the Dacheng Uplift， Jizhong Depression.Earth Science，51（9）：3562-3577. DOI： 10.3799/dqkx.2025.209.

摘要

渤海湾盆地大城凸起石炭系‒二叠系深部煤层气含气性差异及其控制因素是当前勘探开发中面临的重要难题.为此，对大城凸起已有探井开展含气量分析和模拟计算，结果显示大城凸起石炭系‒二叠系煤层含气量具有明显的“北低南高”分布格局，南部探井含气量普遍超过10 m³/t.储层温度、压力、含水饱和度、煤变质程度以及孔隙特征是影响煤层含气性的关键因素.随着煤变质程度（

）的增加，甲烷的吸附能力增强，但游离气含量呈下降趋势；孔容积与含气量呈显著正相关，而总孔隙度与

存在负相关关系，灰分含量的增加也会导致总孔隙度的降低.本研究构建了深部煤层在储层压力、温度、煤变质程度和视密度影响下的等温饱和吸附模型和游离气含量预测模型.模型验证表明，预测结果与实验数据具有较好的相关性，可用于深部煤层甲烷吸附量的预测.计算结果显示，甲烷的饱和吸附量在埋深约1 100

m处达到临界值14 m³/t，游离气含量随埋深增加呈增长趋势并趋于稳定，总含气量的临界深度位于 1 500 m左右，含气量可达16 m³/t.综合考虑煤层含气量、气体赋存状态和埋深，认为1 500 m以深总含气量介于14~ 16 m³/t，游离气占比在25%~44%之间，兼具高含气量与可动游离气优势，是大城凸起区的最优开发深度范围.大城凸起煤层气含气量高值区受煤岩热成熟度影响较大，煤层生气能力是控制大城凸起深部煤层气富集的首要因素.

Abstract

The differences in gas content and their controlling factors in the deep coalbed methane (CBM) reservoirs of the Carboniferous-Permian strata in the Dacheng Uplift of the Bohai Bay Basin remain critical challenges in exploration and development efforts. This study analyzes gas content data from existing wells in the Dacheng Uplift and conducts numerical simulations. The results demonstrate that the Dacheng Uplift exhibits a distinct “lower in the north and higher in the south” gas content distribution pattern in its Carboniferous-Permian coal seams

with gas contents in southern exploration wells generally exceeding 10 m³/t. Key controlling factors on coalbed gas content include reservoir temperature

pressure

water saturation

coal rank

and pore characteristics. As coal rank (

) increases

methane adsorption capacity strengthens while free gas content decreases. Pore volume shows a significant positive correlation with gas content

whereas total porosity negatively correlates with coal rank (

). Increased ash content also leads to reduced total porosity. This study further constructs isothermal adsorption and free gas content prediction models for deep coal seams under the influence of reservoir pressure

temperature

coal rank

and apparent density. Model validation demonstrates good correlation between predicted results and experimental data

validating their applicability for estimating methane adsorption capacity in deep coal seams. Calculations reveal that methane saturation adsorption reaches a critical value of 14 m³/t at approximately 1 100 m burial depth

while free gas content increases with depth before stabilizing. The critical burial depth for tot

al gas content is around 1 200 m

where gas content reaches 16 m³/t. Considering gas content

gas occurrence state

and burial depth comprehensively

the optimal development depth range for the Dacheng Uplift is identified as 1 500-2 600 m

where total gas content ranges between 14-16 m³/t with free gas accounting for 25%-60%. This depth interval combines high gas content with mobile free gas advantages

representing the most favorable target zone for CBM exploitation in this area. The high gas content zones in the Dacheng Uplift are significantly influenced by coal rank and thermal maturity

with the gas generation capacity of the coal seams being the primary controlling factor for the enrichment of deep coalbed methane in this area.

关键词

Keywords

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