AN APPROACH ON GASES DERIVED FROM COAL MEASURES IN JIZHONG DEPRESSION——A Discussion with Mr.Wang Xueping et al
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摘要: 本文主要针对王雪平等[1]提出的“冀中坳陷天然气源主要为油型气”进行讨论.作者通过有关资料的对比和研究,认为冀中坳陷的天然气既有油型气又有煤成气,且以石炭-二叠系为主要源岩.从目前探明的天热气储量来看也是如此,99.3%的天然气集中分布于有二叠系分布的奥陶系和石炭-二叠系潜山中,源于第三系的天然气仅占探明储量的0.7%.Abstract: According to the σ13C values of methane,the gases in Jizhong Depression can be divided into three groups as follows.-55‰ for shallow biogenetic gas,-53.5‰— -40.4‰ for the gas derived from oil,and -39.6‰— -33.9‰ for the gas derived from coal measures.The 40Ar/36Ar values of coal measure gas are similar to those of oil-derived gas and they may be formed in the late stage of gas generation.The coal measure gas in the depression mainly formed by secondary gas generation as the depression resubsided in Tertiary time.It is evident that 99,3 percent of the presently proved gas reserves is discovered at Permo-Carboniferous buried hills,and Ordovician buried hills with Permo-Carboniferous cover while only 0.7 percent of the proved gas reserves is discovered in Tertiary systems.
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[1] 王雪平等,1986,冀中坳陷天然气源几个问题的浅析,石油实验地质,第8卷第3期. [2] 徐永昌等,1985,中原、华北油气区“煤型气”地化特征初探,沉积学报,第3卷第2期. [3] 唐秉琦,1986,天然气勘探,石油工业出版社,109-116页. [4] 刘德汉等,1985,苏桥地区残殖煤的发现——兼论煤成气、煤成油的判别和我国煤成油的前景,地球化学,第4期. [5] 戴金星等,1986,煤成气的鉴别标志,煤成气地质研究,石油工业出版社. [6] Schoell,M.,1983,Generic characterization of natural Bases,AAPG.V.67,N.12.
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