现代地质Issue(6)：1297-1306,10.
南堡凹陷2号构造带天然气成因分析
Genetic Analysis of Natural Gas in No.2 Structural Belt of Nanpu Depression
摘要
Abstract
The origin of natural gas in No.2 structural belt of Nanpu depression is still unclear.Geological and geochemical approaches are utilized to reveal the characteristics and genetic mechanisms of deep and shallow natural gas.The results show that the components of natural gas in No.2 structural belt are dominated by hydro-carbon gas with non-hydrocarbon mainly composed of CO2 ,N2 and H2 S,which are mainly found in buried hill reservoirs.The dry coefficient of natural gas varies from 0.68 to 0.94,indicating mainly a wet gas.Carbon iso-topes of natural gas are relatively heavy,showing a tendency of normal order,but some samples display a par-tially reversed isotopic order with δ13 C3 >δ13 C4 .There are three types of natural gas in No.2 structural belt with the analysis of organic matter type and maturity:the mixture gas generated during early phase of mature stage (gas within Ed1 and Ng),the mixture gas generated during late phase of mature stage (gas within LPN1 fault block)and coal-based pyrolysis gas generated during high mature stage (gas within NP280 fault block).The comprehensive analysis indicates that the natural gas within Ed1 and Ng formations of Tertiary is mainly genera-ted from Ed3 and Es1 source rocks,while natural gas within buried hill is mainly derived from humic type organ-ic matter in Es3 Member.Faults and unconformities are the main paths for hydrocarbon migration.This research should be helpful to further exploration of deep and shallow natural gas in Nanpu depression.关键词
南堡凹陷/2 号构造带/天然气成因/碳同位素Key words
Nanpu depression/No.2 structural belt/natural gas origin/carbon isotope分类
能源科技引用本文复制引用
陈湘飞,李素梅,王政军,徐满,孟祥兵..南堡凹陷2号构造带天然气成因分析[J].现代地质,2014,(6):1297-1306,10.基金项目
国家重大科技专项（2011ZX05006-006-02-006）。 （）
