【摘要】 深部煤层气吸附气含量预测及主控因素分析是煤层气勘探开发的核心环节。在准噶尔盆地等复杂地质构造区，精准预测煤层气含量及分布规律尤为关键。本文对准噶尔盆地东缘白家海地区深部煤层吸附气特征开展系统分析，结果表明：(1)白家海凸起500～4 000 m埋深范围内，西山窑组煤层吸附气含量为2.44～10.26 m3/t，八道湾组为4.57～12.07 m3/t，后者平均值（9.75 m3/t）显著高于前者（8.72 m3/t）。(2)吸附气含量随埋深变化呈典型3阶段演化模式：浅部（小于1 000 m）受控于压力主导正效应，含量快速增加；中深部（1 000～2 000 m）压力与温度效应趋于平衡，含量增幅放缓；深部（大于2 000 m）温度负效应超越压力正效应，含量随埋深增加而递减。(3)研究区主力煤层封盖层厚度大、岩性致密（以泥岩为主），具备优越的煤层气封存条件，表明白家海凸起具良好煤层气富集潜力。本研究建立的吸附气含量预测模型及主控因素分析，为深部煤层气资源潜力评估与开发策略的制定提供了理论依据。更多还原

【Abstract】 Accurate prediction of adsorbed gas content and identification of its controlling factors in deep coalbed methane(CBM) reservoirs are critical for resource evaluation and development, particularly in geologically complex regions like the Junggar Basin. This study investigates the adsorbed gas characteristics of deep coal seams in the Baijiahai area, eastern margin of the Junggar Basin. The results demonstrate that:(1) Within the depth range of 500-4000 m in the Baijiahai Uplift, the adsorbed gas content ranges from 2.44 to 10.26 m~3/t for the Xishanyao Formation and 4.57 to 12.07 m~3/t for the Badaowan Formation, with the latter exhibiting a higher average value(9.75 m~3/t vs 8.72 m~3/t).(2) The variation of adsorbed gas content with depth follows a distinct three-stage model: a rapid increase at shallow depths(<1 000 m)dominated by the positive pressure effect; a slowed growth rate at intermediate depths(1 000～2 000 m) where pressure and temperature effects reach equilibrium; and a gradual decrease at depths >2 000 m, where the negative temperature effect supersedes the positive pressure effect.(3) The main coal seams in the study area are capped by thick, lowpermeability lithologies(predominantly mudstone), indicating favorable conditions for CBM sealing and enrichment within the Baijiahai Uplift. The prediction model and factor analysis established in this study provide a scientific foundation for evaluating deep CBM resource potential and optimizing development strategies.更多还原