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首页> 外文期刊>Frontiers of earth science >Coalbed methane enrichment model of low-rank coals in multi-coals superimposed regions: a case study in the middle section of southern Junggar Basin
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Coalbed methane enrichment model of low-rank coals in multi-coals superimposed regions: a case study in the middle section of southern Junggar Basin

机译：多煤层叠加地区煤层气富含煤层浓缩模型：南部Junggar盆地中间段案例研究

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摘要

The Middle Jurassic Xishanyao Formation in the central section of the southern Junggar Basin has substantial amounts of low-ranked coalbed methane (CBM) recourses and is typically characterized by multi superimposed coal seams. To establish the CBM enrichment model, a series of experimental and testing methods were adopted, including coal maceral observation, proximate analysis, low temperature nitrogen adsorption (LTNA), methane carbon isotope determination, porosity/permeability simulation caused by overburden, and gas content testing. The controlling effect of sedimentary environment, geological tectonic, and hydrogeological condition on gas content was analyzed in detail. The results demonstrate that the areas with higher gas content (an average of 8.57 m(3)/t) are mainly located in the Urumqi River-Santun River (eastern study area), whereas gas content (an average of 3.92 m(3)/t) in the Manasi River-Taxi River (western study area) is relatively low. Because of the combined effects of strata temperature and pressure, the gas content in coal seam first increases and then decreases with increasing buried depth, and the critical depth of the inflection point ranges from 600 m to 850 m. Affected by the changes in topography and water head height, the direction of groundwater migration is predicted from south to north and from west to east. Based on the gas content variation, the lower and middle parts of the Xishanyao Formation can be divided into three independent coal-bearing gas systems. Within a single gas-bearing system, there is a positive correlation between gas content and strata pressure, and the key mudstone layers separating each gas-bearing system are usually developed at the end of each highstand system tract. The new CBM accumulation model of the multi-coals mixed genetic gas shows that both biological and thermal origins are found in a buried depth interval between 600 m and 850 m, suggesting that the coals with those depths are the CBM enrichment horizons and favorable exploration regions in the middle section of the southern Junggar Basin. An in-depth discussion of the low-rank CBM enrichment model with multi-coal seams in the study region can provide a basis for the optimization of CBM well locations and favorable exploration horizons.
机译：侏罗纪尾涛在南部南部盆地中央部分形成大量的煤层气（CBM）勘探，通常是多叠叠煤层的特征。为了建立CBM浓缩模型，采用了一系列的实验和测试方法，包括煤炭丙酰化观察，近分析，低温氮吸附（LTNA），甲烷碳同位素测定，覆盖层引起的孔隙率/渗透性模拟，以及煤气含量检测。详细分析了沉积环境，地质构造和水文地质条件的控制效果。结果表明，乌鲁木齐河 - 圣社会河（东部研究区）的含量较高的区域（平均为8.57米（3）/ t），而煤气含量（平均为3.92米（3） / t）在马西河 - 出租车（西方学习区）相对较低。由于地层温度和压力的综合影响，煤层中的气体含量首先增加，然后随着掩埋深度的增加而降低，拐点的临界深度为600米至850米。受到地形和水头高度的变化影响，地下水迁移的方向从南北到北部，从西向东。基于气体含量变化，西琴岛地层的下部和中间部分可分为三个独立的煤气系统。在单个燃气系统内，气体含量和地层压力之间存在正相关，并且分离每个含气系统的关键泥岩层通常在每个高价系统的末端开发。多煤混合遗传气体的新CBM累积模型表明，生物和热起源均在600米和850米之间的掩埋深度间隔中发现，表明与这些深度的煤是CBM富集视野和有利的勘探区域在南部Junggar盆地的中间部分。对研究区域多煤层的低秩CBM浓缩模型的深入深入讨论可以为CBM井位置和有利的勘探视野提供依据。

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