煤层厚度变化较大，总的规律是东厚西薄，局部分叉尖灭。
Generally it is thicker in the east-ern part, than in the western part and local offset and thin out.
富煤带位于大型砂体之北侧，煤层稳定性较差，且变薄、分岔、尖灭现象普遍。
The rich coal region is located in the north side of large sand body, showing poor stability, and becoming thin, splitting an…
火成岩对煤层挤压揉皱形成构造煤，同时构造尖灭端应力集中，提供了足够的瓦斯热力学能。
In the closed seam, the pyrogenic rock compressed and compacted the structure coal. There is a stress concentrated at the tip of the structure, which could provide the inner energy for the gas.
火成岩对煤层挤压揉皱形成构造煤，同时构造尖灭端应力集中，提供了足够的瓦斯热力学能。
In the closed seam, the pyrogenic rock compressed and compacted the structure coal. There is a stress concentrated at the tip of the structure, which could provide the inner energy for the gas.
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