摘要
我国现有的煤层气选区评价方法主要是基于中高阶煤层气的特点而制定,并没有将低煤阶煤层气的特殊性放入整体内进行考虑,对低煤阶煤层气勘查开发有利区块优选指导意义不强。以寻求低煤阶煤层气高含气量区块并获得高产气量为主要目标,提出了含气量、储层压力(压力梯度)、渗透率、煤层气资源丰度、水文地质条件、煤层单层厚度、煤层埋深、成因类型、顶底板岩性组合和煤层稳定性共10个评价参数,对各参数进行排序并分配相应权重,建立了一种低煤阶煤层气有利区多参数定量评价方法。以准南西山窑组煤层气为例,进行了有利区的优选与评价,结果表明,头屯河乌鲁木齐河与玛纳斯河清水河区块的煤层气勘探条件最好,可作为未来的重点目标区。
The existing evaluation methods for coalbed methane(CBM)selection area in China are mainly based on the characteristics of medium-high rank CBM,and do not take into account the particularity of low rank CBM as a whole.Therefore,the guidance significance for selecting favorable blocks for exploration and development of low rank CBM is not strong.With the main goal of seeking high gas content blocks of low rank CBM and obtaining high gas production,10 evaluation parameters were proposed,including gas content,reservoir pressure(pressure gradient),permeability,CBM resource abundance,hydrogeological conditions,coal seam single-layer thickness,coal seam burial depth,genesis type,roof and floor lithology combination,and coal seam stability.The parameters were sorted and assigned corresponding weights,and a multi parameter quantitative evaluation method for favorable areas of low rank CBM was established.Taking the CBM of the Zhunnan Xishanyao Formation as an example,the optimization and evaluation of favorable blocks were carried out,and the results showed that the Toutunhe-Urumqi River block and Manashe-Qingshuihe block had the best CBM exploration conditions and could be used as key target areas in the future.
作者
袁远
邵长东
唐跃
仝立华
毕彩芹
YUAN Yuan;SHAO Changdong;TANG Yue;TONG Lihua;BI Caiqin(Oil and Gas Resources Survey Center,China Geological Survey,Haidian,Beijing 100083,China;State Key Laboratory of Continental Shale Oil,Haidian,Beijing 100083,China;China Coal Geology Group Co.,Ltd.,Shijingshan,Beijing 100040,China)
出处
《中国煤炭》
北大核心
2025年第1期73-81,共9页
China Coal
基金
中国地质调查局地质调查项目“全国煤层(系)气地质调查与评价”(DD20240051)
中国地质调查局地质调查项目“全国重点地区煤层(系)气资源潜力评价”(DD20242050)。
关键词
准噶尔盆地南缘
西山窑组
低煤阶煤层气
有利区评价
煤层气勘探
southern margin of the Junggar Basin
Xishanyao Formation
low rank CBM
evaluation of favorable blocks
CBM exploration
