木里煤田侏罗系煤系非常规气共存规律研究  

Study on unconventional gas coexisted law of Jurassic coal measures in Muri Coalfield

作　　者：李靖[1,2] 姚征[1,3] 陈利敏[1,4] 蒋艾林 杨承伟[1] 曹代勇[1] 

机构地区：[1]中国矿业大学(北京)煤炭资源与安全开采国家重点实验室,北京100083 [2]山西能源学院,山西晋中030600 [3]陕西省地质调查中心,陕西西安710068 [4]北京城建勘测设计研究院有限责任公司,北京100101

出　　处：《煤炭科学技术》2017年第7期132-138,共7页Coal Science and Technology

基　　金：国家自然科学基金资助项目(41572141);高等学校博士学科点专项科研基金资助项目(20110023110003);中央高校基本科研业务费专项资金资助项目(2010YD11)

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。In order to explore the coal measures gas deposition features of Muri Coalfield,with the analysis and test on the gas content,organic geochemistry of the hydrocarbon source rock and the reservoir physical properties,the paper held that there was a big variation in the gas content of the coal measures gas and the gas content at the top section in Muri Formation was highest. The total organic carbon content and hydrocarbon potential evaluation showed that the hydrocarbon source rock of the coal measures in the block was excellent quality hydrocarbon source rock. Among them,the coal would be a Ⅲ type kerogen and the oil shale and mudstone would be Ⅱ2type keroge. The Rodistribution would be 0.74% ~ 1.85% and would be in a maturing to high mature favorable gas production stage. The porosity of the coal reservoir was ranged from 2.7% ~ 13.7%,the permeability was ranged between（ 0.03 ~ 10.6） × 10-3μm2,the porosity of the shale and tight sandstone reservoir would not be over 4.5% generally and the permeability would be lower than 0.1×10-3μm2generally. In combination with the analysis on the typical boreholes,there were three coal measures unconventional gas coexisted combined models established within the block. Based on the summarization on the formation features of the coal measures unconventional gas in Muli Coalfield,the comprehensive analysis showed that the upper section of Muli Formation,Middle Jurassic and Jiangcang Formation would be the key floor section of the unconventional gas exploration. A proposal on the further exploration and development of the gas was provided.

关 键 词：煤系非常规气 木里煤田 致密砂岩 侏罗系 

分 类 号：P618[天文地球—矿床学]