Yanma minefield, a block with large gas content, coal thickness variation in structure, is controlled by Fenghuangling Fault and Yuhe Fault.
演马井田是受凤凰岭断层和峪河断层控制的断块，瓦斯含量较高，构造煤厚变化大。
Yanma minefield, a block with large gas content, coal thickness variation in structure, is controlled by Fenghuangling Fault and Yuhe Fault.
演马井田是受凤凰岭断层和峪河断层控制的断块，瓦斯含量较高，构造煤厚变化大。
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