济阳坳陷天然气的判识标志

IDENTIFYING CRITERIA OF NATURAL GASES IN THE JIYANG DEPRESSION

作者综合利用碳、氢同位素,C_1—C_2轻烃组成及其它有机地球化学分析资科,对济阳坳陷天然气的成因和成熟度等进行研究,提出了判识济阳坳陷天然气各种成因类型和成熟度的判识标志。细菌降解油型气是济阳坳陷特殊类型的天然气,应用这些判识标志可以成功地把细菌降解次生型天然气和各种原生气分开,同时利用岩石脱气直接对比法并结合演化方程间接对比法,基本确定了济阳坳陷浅层、中层、深层天然气的源岩问题。

Based on the conprehensive utilization of the data of carbon and hydrogen isotopes, the compositions of light hydrocarbons (C1-C7) , and the other organic geochemical analyses, the author studied the genesis and maturity of natural gas in the Jiyang Depression. In order to determine different types of gensis and the levels of maturation in the depression, some identifying criteria of the natural gases have been proposed in this paper. Only the gas from biodegration is a specific type of the natural gas in the Jiyang Depression, and the secondary gases derived from bio-degradation can be distinguished from various primary gases with these criteria. Meanwhile, the gas source rocks of shallow, middle and deep strata in the depression can be basically determined on the basis of direct correlation on degasing analysis and indirect correlation on hydrocarbon evolutionary equations.