JOURNAL OF PALAEOGEOGRAPHY ›› 2011, Vol. 13 ›› Issue (3): 317-324. doi: 10.7605/gdlxb.2011.03.008

• PALAEOGEOGRAPHY AND MINERAL RESOURCES • Previous Articles     Next Articles

Sequence stratigraphy and coal accumulation of the Jurassic in Wailihada mining area of Muli Coalfield in Qinghai Province

Xu Xiaoyan1, Shao Longyi1, Zhang Fade2, Huang Man1, Ju Qi2, Wen Huaijun2, Wang Wenlong1, Lu Jing1   

  1. 1 Department of Resources and Earth Sciences，China University of Mining and Technology(Beijing)，Beijing 100083
    2 Qinghai Administration of Coal Geology，Xining 810000，Qinghai
  • Received:2010-10-20 Revised:2011-02-20 Online:2011-06-01 Published:2011-06-01
  • About author:Xu Xiaoyan，born in 1984，is a postgradute candidate of China University of Mining and Technology(Beijing).She is mainly engaged in sedimentology and sequence stratigraphy.E-mail:373136975@qq.com.
    About the corresponding author Shao Longyi is a professor of Department of Resources and Earth Sciences, China University of Mining and Technology(Beijing).

青海木里煤田外力哈达矿区侏罗系层序地层与聚煤作用

徐晓燕1 邵龙义1 张发德2 黄曼1 鞠琪2 文怀军2 王文龙1 鲁静1   

  1. 1 中国矿业大学(北京)资源与地球科学系，北京 100083
    2 青海煤炭地质局，青海西宁 810000
  • 通讯作者: 通讯作者简介 邵龙义，男，现为中国矿业大学（北京）资源与地球科学系教授 E-mail:373136975@qq.com
  • 作者简介:徐晓燕，女，1984年生，现为中国矿业大学（北京）硕士研究生。研究方向为沉积学和层序地层学。E-mail:373136975@qq.com。
    通讯作者简介 邵龙义，男，现为中国矿业大学（北京）资源与地球科学系教授。

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Abstract: Sequence stratigraphy and coal accumulation of the Jurassic lacustrine clastic coal measures in the Wailihada mining area of northeastern Qinghai were studied using borehole data.A total of 5 third-order sequences and corresponding systems tracts were subdivided.Within each sequence，the lowstand systems tract(LST)is composed of grayish white coarse-grained sandstones of fluvial or distributary channel facies，the transgressive systems tract(TST)consists of sandy mudstones of flood basin and interdistributary bay facies，and the highstand systems tract(HST)is dominated by the mudstone and carbonaceous mudstones of the lacustrine and interdistributary bay facies.Thick coal was formed in the middle stage of the TST of sequence S1，and no major coals were formed in the LST and HST.This is mainly due to a balanced development of accommodation space rates and peat accumulation rates during middle stage of the TST，when the interdistributary environments favored the accumulation of thick coals.

Key words: Muli Coalfield, sequence stratigraphy, coal accumulation, Jurassic

摘要： 利用钻孔岩心数据，对青海北部木里煤田外力哈达矿区侏罗纪湖盆相陆源碎屑含煤岩系进行了层序地层学和聚煤作用的研究。研究区侏罗系共划分出5个三级层序及相应的体系域。在每个层序中，低位体系域由河道相或分流河道相灰白色粗砂岩、细砂岩组成，湖侵体系域由泛滥盆地相或分流间湾相砂质泥岩组成，高位体系域由湖泊相或分流间湾沼泽相泥岩和碳质泥岩组成。厚煤层主要形成于层序S1的湖侵体系域中期，高位体系域和低位体系域基本没有煤层发育。这主要是在湖侵体系域中期，由于可容空间增加速率与泥炭堆积速率相平衡，因此，在三角洲平原分流间湾环境易形成较厚的煤层。

关键词: 木里煤田, 层序地层, 聚煤作用, 侏罗系

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