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
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.
SONG Ming-shui, ZHANG Xue-cai . DISCUSSION ON DEEP GAS GEOCHEMICAL CHARACTERISTICS AND GENESIS OFBONAN SAG, JIYANG DEPRESSION[J]. Natural Gas Geoscience, 2004 , 15(6) : 646 -649 . DOI: 10.11764/j.issn.1672-1926.2004.06.646
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