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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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基于13cnmr谱的煤层气应力成藏作用机理及控气意义
Keywords: 构造应力,控藏意义,核磁共振,煤层气成藏进程
Abstract:
？构造应力是促进煤化作用，从而也是影响煤层气生成的主要因素。为了探索浅层脆性条件下，不同类型构造应力对煤层气形成的影响机理和控藏意义，利用豫西煤田重力滑动构造典型的应力分区特性，在挤压、拉伸和剪切3个构造变形单元内，分别采集主采二1煤样并测定核磁共振吸收强度。测试结果表明，挤压、拉伸和剪切3个构造单元内煤样的芳碳率依次减小，数值分别是0.773、0.730、0.702,而脂碳率依次增加,数值分别是0.138、0.167、0.182，各官能团的相对含量亦随应力分区的不同呈现相应的变化。此外，羧基碳含量依次是0.061、0.042、0.082，羰基碳含量依次是0.053、0.030、0.016。上述nmr结构参数佐证，低温条件下构造应力仍然是重要的煤化作用因素，但不同性质的构造应力，其控制作用程度则有所不同。各向异性挤压应力的作用机制相对强烈，对煤层气成藏进程具有较大的促进作用|拉伸应力的煤化作用仅次于挤压应力；由浅层滑动作用引起的剪切应力对煤层气产生的促进作用相对最小。研究成果对煤矿安全生产和煤层气的综合开采利用具有一定理论意义。
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