Geochemical and mineralogical studies have shown that N is a ubiquitous component in igneous, metamorphic, and especially sedimentary rocks. N is structurally bound in the form of NH<sub>4</sub><sup>...Geochemical and mineralogical studies have shown that N is a ubiquitous component in igneous, metamorphic, and especially sedimentary rocks. N is structurally bound in the form of NH<sub>4</sub><sup>+</sup> in such minerals as buddingtonite, NH<sub>4</sub>-bearing biotite or mica. NH<sub>4</sub>-illite has been reported abroad; however, no detailed report about it has been made in Chi-展开更多
This paper considers, through a lot of measured data of coal-bed gas, that the coal-bed gas is a kind of mixed gas of complex composition with some heavy hydrocarbons. In general, it is not a dry gas. The coal-bed hyd...This paper considers, through a lot of measured data of coal-bed gas, that the coal-bed gas is a kind of mixed gas of complex composition with some heavy hydrocarbons. In general, it is not a dry gas. The coal-bed hydrocarbon gases can obviously be divided into three stages of gas-storage: "poor hydrocarbon-storing stage", "rich hydrocarbon-storing stage" and "declining hydrocarbon stage". Authors point out that the normal gas geochemical indexes can relatively well show the geochemical chatacteristics of coal-bed gas. But, "the Benzene Index (B)" is a good indicator to identify the gas original types, and "the Hexane Index(H)" can show the gas evolution law and the organic matter maturity.展开更多
文摘Geochemical and mineralogical studies have shown that N is a ubiquitous component in igneous, metamorphic, and especially sedimentary rocks. N is structurally bound in the form of NH<sub>4</sub><sup>+</sup> in such minerals as buddingtonite, NH<sub>4</sub>-bearing biotite or mica. NH<sub>4</sub>-illite has been reported abroad; however, no detailed report about it has been made in Chi-
文摘This paper considers, through a lot of measured data of coal-bed gas, that the coal-bed gas is a kind of mixed gas of complex composition with some heavy hydrocarbons. In general, it is not a dry gas. The coal-bed hydrocarbon gases can obviously be divided into three stages of gas-storage: "poor hydrocarbon-storing stage", "rich hydrocarbon-storing stage" and "declining hydrocarbon stage". Authors point out that the normal gas geochemical indexes can relatively well show the geochemical chatacteristics of coal-bed gas. But, "the Benzene Index (B)" is a good indicator to identify the gas original types, and "the Hexane Index(H)" can show the gas evolution law and the organic matter maturity.
