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川东地区中石炭统为一套厚仅数米一数十米的角砾云岩、蓝藻白云岩夹粒屑云(灰)岩。主要分布于华莹山以东,重庆-丰都以北,通江-开县以南,云阳-石柱以西的范围内。除边缘地区有零星露头外,均深埋地腹,故长期被人们所忽视。自1977年10月在川东相国寺构造中石炭统钻获工业性气流后,又相继在福成寨、雷音铺等构造中获高产气流,从而引起了对川东中石炭统的重视。
The Carboniferous in eastern Sichuan is a set of brecciated dolomites and blue-green algae dolomite-grained cloud (ash) rocks that are only a few meters and tens of meters thick. Mainly distributed in the east of Huayingshan, Chongqing - Fengdu north, Tongjiang - south of Kaixian, Yunyang - Shizhu west of the range. In addition to sporadic outcrops, are deeply buried, so long ignored by people. Since the industrialized gas flow was obtained from the Carboniferous system in the Xiangguosi area in eastern Sichuan in October 1977, high-yield gas streams have been successively obtained from structures such as Fuchengzhai and Leiyinpu, thus giving rise to the emphasis on the Carboniferous in eastern Sichuan.