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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。
Tectonic stress is to promote coalification, which is also the main factor affecting the formation of coalbed methane. In order to explore the influence mechanism of different types of tectonic stress on the formation of coalbed methane and the significance of reservoir control under shallow brittleness conditions, the typical stress partitioning characteristics of the gravity-sliding structure in the western Henan coalfield are used to study the effects of three structural deformations on extrusion, tension and shearing Units were collected from the main mining two coal samples and determination of NMR absorption intensity. The test results show that the carbon percentage of the coal samples in the three structural units of extrusion, stretching and shearing decrease in turn, with the values of 0.773, 0.730 and 0.702 respectively, while the percentages of carbon and carbon increase successively, with the values of 0.138 and 0.167, respectively. 0.182, the relative content of functional groups also showed corresponding changes with different stress zones. In addition, the carboxyl carbon content of 0.061,0.042,0.082, carbonyl carbon content in turn were 0.053,0.030,0.016. The above mentioned NMR structural parameters support the fact that tectonic stress is still an important coalification factor under low temperature conditions. However, the tectonic stresses of different nature have different degrees of control. The action mechanism of anisotropic compressive stress is relatively strong and has a significant promoting effect on the process of coal-bed gas accumulation. The coal tarification of tensile stress is second only to compressive stress, and the shear stress caused by shallow sliding action exerts a significant influence on the coal seam The promotion of gas production is relatively minimal. The research results have certain theoretical significance for coal mine safety production and comprehensive exploitation of coalbed methane.