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沁水盆地晚古生代含煤沉积体系及其控气作用-地球科学与环境学报
29 4 No .4 Vol .2 9
2 0 0 7 12 Journal of Earth Sciences and Environment Dec.2 0 0 7
贾建 称
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:P618.11 :A :1672-6 61(2007)04-0374-09
Coal Depositional System and Its Controlling Role of
CoalbedMethanein LatePaleozonic of Qinshui Basin
JIA Jian-cheng
(X i an Branch of Ch ina Coa l R esear ch I nst i tut e, X i an 7100 4, S haan x i, Ch ina)
Abstract:The main coal-bearing strata in the Qinshui Basin are late Carboniferous Epoch Taiyuan Formation and
Early Permin Epoch Shanxi Formation.The No.1 coalbed of Taiyuan Formation and No.3 coalbed in Shanxi
Formation, belonging to premium anthracite, are w orkable seams.Multidisciplinary analysis on genetic facies and
their assemblage show s that Taiyuan Formation is made up of epeiric sea barrier island depositional system-
carbonate plateau system, No.1 coalbed w as formed in tidal delta environment which sustaining a long time of
marine regression, and the thickness of No.1 coalbed is thicker in bog of delta plain, thinner in stagnant
barchans and stable in barrier bar.Shanxi Formation constitutes of fluvial-dominated delta depositional system,
and No.3 coalbed formed is thicker and simple in structure because isostatic compensational deposit lasted for a
long time.But the coalbed formed in delta front bar is thinner and is unstable in distributary channel.Indicated
by exploratory of coalbed methane in the Qinshui Basin, No.3 coalbed is thicker, the source ability is st ronger,
preservative condition of coalbed methane is more ascendant, and volume concentration, saturation, resourc
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