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准噶尔盆地东南部低煤阶煤层气富集条件及主控因素 被引量:46

Accumulation and Geological Controls of Low-Rank Coalbed Methane in Southeastern Junggar Basin
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摘要 准噶尔盆地煤层气资源丰富。其中,准东南地区煤层分布稳定,厚度大,埋深适中,含气性较好,是煤层气勘探有利区。然而,准东南地区近年来的煤层气勘探没有取得理想效果,对低煤阶煤层气富集主控因素认识不足是其主要原因之一。本文通过对煤层气地质特征和富集条件的分析,认为准南地区煤岩演化程度高,水文条件较好,有次生生物气及深部热解气的补充,气源充足,富集条件好;准东地区尽管煤层厚度大,但煤岩演化程度低,地下水矿化度高,不具备生物气补充条件,且缺乏区域盖层,富集条件较差,导致煤层含气量低。进一步分析认为,构造、水文和盖层是准南地区煤层气富集的主控因素,有利的构造部位控制着深部热解气源,水文地质条件控制着次生生物气的补给,盖层控制了煤层气的保存条件。 Coalbed methane (CBM) resources in the Junggar Basin, Xinjiang, China are abundant. The most favorable targets for CBM resources occur in the southern Junggar Basin, with stable and thick coal seams, shallow buried depth and higher CBM content. The lack of geological knowledge of CBM accumulation and generation is the reason why the exploration in the region had not achieved for many years. Based on the analysis of CBM accumulating conditions, it was considered that the favorable geological controls of CBM accumulation occur in southern Junggar with the higher coal rank, the better hydrological conditions and the abundant gas supply including the secondary biogenic gas and pyrolzed deep gas. CBM content is low in eastern Junggar because of the lower coal rank, higher groundwater mineralization and the poor CBM preservation. On the basis of the analysis abovementioned, it was suggested that the key geological controls of CBM accumulation in the southern Junggar are the structure, hydrology and cap-rock. Favorable structural positions could control the pyrolyed deep gas supply. The hydrogeological conditions might be favorable of secondary biogenic gas generation. The favorable cap rocks could make CBM to be preserved.
出处 《高校地质学报》 CAS CSCD 北大核心 2012年第3期460-464,共5页 Geological Journal of China Universities
基金 国家科技重大专项项目(2011ZX05033-02)
关键词 准东南地区 煤层气 富集 主控因素 southeastern Junggar Basin coalbed methane reservoiring condition geological key control
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