The Calcisphere in carboniferousseries in middle part of HerdongCoal Basin is classified into seven types in the paper.
文中将河东煤田中部石炭系灰岩中的钙球划分为七种类型。
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Permo Carboniferous coal series have relative good coal gas potential, dark mudstones in lower Jurassic, lower part of Middle Jurassic and lower Cretaceous are the best source rocks.
Its wall rocks consist of the regional metamorphic rock, series of Mayuan formation and middle-lower Carboniferousseries as well as lower Jurassic Lishan formation.