收稿日期: 2004-10-08
修回日期: 2004-10-08
网络出版日期: 2004-12-20
DISCUSSION ON DEEP GAS GEOCHEMICAL CHARACTERISTICS AND GENESIS OFBONAN SAG, JIYANG DEPRESSION
Received date: 2004-10-08
Revised date: 2004-10-08
Online published: 2004-12-20
宋明水, 张学才 . 济阳坳陷渤南洼陷深层天然气的地球化学特征及成因探讨[J]. 天然气地球科学, 2004 , 15(6) : 646 -649 . DOI: 10.11764/j.issn.1672-1926.2004.06.646
According to the chemical composition, carbon isotope, hydrogen isotope and noble gas isotope researches, the deep gas of Bonan sag displayed the characteristics of normal accompanying gas with crude oil, with high contents of heavy hydrocarbons. The genesis of the deep gas may not be high mature to over mature source rocks. The characteristics of carbon and hydrogen isotope composition show that the deep gas of Bonan sag mixed by biogenic gas, thermgenic gas and coal-formed gas. The noble gas (He) isotope of the deep gas from Bonan sag indicated that the accompanying gas with crude oil in the sag is typical crust type gas, without clear mantle type gas. Based on the low frequency of deep fault activity, Bonan sag provided a advantaged geologic area for deep oil and gas accumulation.
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