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The measurement of the noble gas isotopes in hydrocarbon natural gases is relatively difficult because their content is very low.In order to reach the accurate values of noble gas isotopes,it is necessary to pay attention to eliminating a lot of interferences.According to work experiences and theoretical analysis,the author suggests that the main factors,interfering the accurate measure ments of the noble gas isotopes for specimens of hydrocarbon natural gases,include that:additional ion fragments,very large...

The measurement of the noble gas isotopes in hydrocarbon natural gases is relatively difficult because their content is very low.In order to reach the accurate values of noble gas isotopes,it is necessary to pay attention to eliminating a lot of interferences.According to work experiences and theoretical analysis,the author suggests that the main factors,interfering the accurate measure ments of the noble gas isotopes for specimens of hydrocarbon natural gases,include that:additional ion fragments,very large contents differences,wide isotope differences of noble gases in different samples.In addition,disturbances of the background of instrument system,leaks and the gas release from materials,etc.Should be also considered for isotopic analysis of noble gases.Furthermore,a series of useful methods are presented to eliminate the interferences and to control the disturbance.

在烃类天然气中 ,由于稀有气体的含量很微 ,所以其同位素组成的检测相对较困难。要实现稀有气体同位素的准确测量 ,还必需排除诸多的干扰因素。本文作者根据多年的实践经验和理论分析 ,认为影响烃类天然气中稀有气体同位素准确测量的干扰主要有 :离子碎片迭加、不同样品中稀有气体组分含量及其同位素组成的巨大差异、仪器系统的本底、漏率和吸附分馏等因素。本文还针对性地提出了相应的控制措施。

Through the synthetically study on the homogenization temperature and occurrence in the authigenic minerals of fluid inclusions in the terrane between or above the coal beds in the Carboniferous-Permain in the Qinshui basin, Shanxi, three stages of expulsion of hydrocarbon from the coal beds were known. Combining with the conclusion of basin evolution, it is deduced that the filling of hydrocarbon happened during J_(2), the early of K_(1) and K_(2)~E_(1). In the early stage, coal beds produced coal-generating...

Through the synthetically study on the homogenization temperature and occurrence in the authigenic minerals of fluid inclusions in the terrane between or above the coal beds in the Carboniferous-Permain in the Qinshui basin, Shanxi, three stages of expulsion of hydrocarbon from the coal beds were known. Combining with the conclusion of basin evolution, it is deduced that the filling of hydrocarbon happened during J_(2), the early of K_(1) and K_(2)~E_(1). In the early stage, coal beds produced coal-generating oil. The stages of expulsion of nature gas are corresponding with the phase of thermocatalysis and thermal cracking, respectively. So the coal-bed gas in the Qinshui basin is mostly composed of gas of thermocatalysis and thermal cracking. The extracted hydrocarbon residues of the coal and the sandstones are appreciably different, because of difference of fractional distillation and the filling of different degrees of hydrocarbon in the coal beds and the sandstones.

通过对沁水盆地石炭—二叠系煤层夹矸及煤层顶板砂岩石样品中的包裹体类型、与矿物的共生关系以及包裹体均一化温度研究,结合山西南部上古生界煤层埋藏史及热史演化分析,讨论了太原组和山西组煤层的排烃历史。结果表明,太原组和山西组煤层排烃主要发生在晚三叠世末期煤层抬升释压以来,大体可以分为中侏罗世、早白垩世早期和晚白垩世一直到古新世三期。早期有过煤成油的阶段,并且有一定规模的排油过程;主要的排气阶段正好与热催化生油气阶段和热裂解生凝析气阶段相对应,那么可以认为热解气和热裂解气是煤层气的主要组成部分。煤储层中液态烃与煤层夹矸及顶板岩石中液态烃组成特征存在着明显差别,可能是由排烃过程吸附分馏作用和不同成熟度液态烃的混合作用不同所致。甾烷和藿烷总体组成特征相似,说明煤层、煤层夹矸及顶板砂岩中油气来源于煤层。

 
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