木里煤田侏罗系煤系非常规气共存规律研究
发布时间:2018-01-24 23:54
本文关键词: 煤系非常规气 木里煤田 致密砂岩 侏罗系 出处:《煤炭科学技术》2017年07期 论文类型:期刊论文
【摘要】:为探索木里煤田煤系气赋存特征,通过含气性、烃源岩有机地化以及储集层物性特征的分析测试,认为煤系气含气量变化较大,以木里组上段含气量最高;总有机碳含量和生烃潜率评价均显示此组煤系烃源岩为优质烃源岩,其中煤为Ⅲ型干酪根,而油页岩、泥岩为Ⅱ2型干酪根,Ro分布在0.74%~1.85%,处于成熟-高成熟度的有利生气阶段;煤储层孔隙度为2.7%~13.7%,渗透率为(0.03~10.6)×10-3μm~2,而页岩及致密砂岩储层孔隙度普遍不高于4.5%,渗透率普遍低于0.1×10~(-3)μm~2。结合典型钻孔分析建立了木里煤田内的3种煤系非常规气共存组合模式。在总结了木里煤田的煤系非常规气的成藏特征基础上,综合分析认为中侏罗统木里组上段以及江仓组是煤系非常规气勘探的重点层段,并进一步提出了勘探开发建议。
[Abstract]:In order to explore the gas occurrence characteristics of coal measures in Muli coalfield, through the analysis and test of gas content, organic geochemistry of hydrocarbon source rock and physical properties of reservoir, it is considered that the gas content of coal measure gas varies greatly, with the upper part of Muli formation having the highest gas content. The evaluation of total organic carbon content and hydrocarbon generation potential shows that the source rocks of this group are high quality source rocks, in which coal is type 鈪,
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