UDEC simulation results show that the porosity of overburden rock fissure field in goaf and its curve is saddle-shaped.
UDEC模拟结果表明，采空区覆岩裂隙区域孔隙率曲线呈鞍状分布。
It is important to master movement rules of overburden rock layers to control roof rationally in special production and geological conditions.
在工作面特定的生产技术和地质条件下，掌握工作面上覆岩层的运动规律，对合理控制顶板非常重要。
The essential elements are source rock, reservoir rock, seal rock and overburden rock, and the processes include trap formation and the generation-migration-accumulation of petroleum.
基本要素包括一套烃源岩、储集层、盖层和上覆岩层，作用是圈闭的形成和油气的生成—运移—聚集。
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