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 Department of Resources and Earth Sciences，China University of Mining and Technology(Beijing)，Beijing 100083 2 Qinghai Administration of Coal Geology，Xining 810000，Qinghai
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.
Xu Xiaoyan,Shao Longyi,Zhang Fade et al. Sequence stratigraphy and coal accumulation of the Jurassic in Wailihada mining area of Muli Coalfield in Qinghai Province[J]. JOPC, 2011, 13(3): 317-324.
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