两种灰岩的生气特征比较研究

依据较纯灰岩和泥灰岩的加水热模拟实验结果,探讨了二者的生气特征。认为二者生气特征存在差异主要与有机质类型和岩石矿物成分有关。泥灰岩比纯灰岩所产气体中含有更多的甲烷、乙烷、异丁烷和异戊烷。在中、低温度段,泥灰岩所产气体的C1/ΣC+1、C2/C3值和所产氢气、氮气的量高于纯灰岩。氢气主要形成于较高和较低温度段,氮气主要形成于中、低温度段。二氧化碳含量与碳酸盐含量有关。在中、低温度段,纯灰岩的总气体、总烃气产率高于泥灰岩,当温度更高时,烃气产率大小则相反。

COMPARISON OF GAS-GENERATING CHARACTERISTICS OF TWO TYPES OF LIMESTONES

In this paper, the author discusses the gas-generating characteristics of the marlite and the shaly limestone by hydropyrolysis. It is directed that their gas-generating characteristics is relative to organic matter and mineral component of rocks.There is more methane,ethane, isobutane and isopentane in shaly limestone than in marlite.At middle and low temperature, there is more hydrogen, more nitrogen, higher dry coefficient and ratio of ethane content to propane's in marlite than in shaly limestone. Hydrogen gas is formed mainly at higher and lower temperature and Nitrogen at middle and lower temperature. Dioxide carbon content is under control of carbonate aboundance in rocks. At middle and low temperature, there is more yield of total gas and hydrocarbon gas in shaly limestone than in marlite,and at higher temperature,there is a higher yield of hydrocarbon gas in marlite than in shaly limestone.