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随着煤成气的研究工作日趋深入,有一些急待解决的课题,如煤大量成气的时间;煤成气藏是邻近的源岩自生气,或是下伏深层源岩的外源气;煤田瓦斯、煤成气及煤系气如何区别等问题。本文针对这三个问题,提出了确定煤成气大量生气时间的裂变径迹法,即用磷灰石的裂变径迹化石参数(径迹密度,径迹长度)确定成气时间的方法;用天然气本身的成熟度与源岩成熟度的关系,确定气源层的方法;用天然气“指纹物”,识别煤田瓦斯、煤成气及煤系气的方法。这些方法简便易行、直接见效,在现有设备及技术力量的条件下都能开展这方面的研究工作。下面对这些方法作一概述,以抛砖引玉。
As the research work on coal gas becomes more and more in depth, there are some urgent issues to be solved, such as the time when a large amount of coal is formed into gas; the coal gas reservoir is the adjacent source rock self-anger or the source gas of the underlying deep source rock ; Coal gas, coal gas and how to distinguish between coal gas and other issues. In view of these three issues, this paper proposes a fission track method for determining the time when a large amount of coal-forming gas is born, that is, the fission track fossil parameter (track density and track length) of apatite is used to determine the time of the fission track. The relationship between the maturity of natural gas and the maturity of source rock, and the method of determining the gas source layer; the method of identifying natural gas, coal gas and coal gas by using “fingerprints” of natural gas. These methods are simple, straightforward and effective, and can be carried out in the light of existing equipment and technological capabilities. The following is a summary of these methods in order to start a discussion.