Characteristics of Carbon and Hydrogen Isotopes and Genetic Type of Hydrocarbon Gases in Qikou Sag
Received date: 2011-08-15
Revised date: 2011-10-01
Online published: 2011-12-10
Genetic types of hydrocarbon gases of Qikou sag are divided according to the relationships among carbon isotope,hydrogen isotope and dry coefficient.This study has extended gas exploration field of the study area,makes the future exploration direction clear.Hydrocarbon gases in Qikou sag are divided into three types,which are biogenic gas,mixture of biogenic and thermogenic gas,and thermogenic gas.Thermogenic gas is the main gas type in Qikou sag,with its proven natural gas reserves more than 95% of the total.Thermogenic gas can be further divided into continental oil-type gas and coal type gas.Oil-type gas,including low mature gas,mature gas and high mature gas,mainly comes from Tertiary lacustrine mudstone.Gas in buried hill of Chenghai is coal-high mature gas,which mainly comes from Permo-Carboniferous coal-measure source rocks.Further natural gas exploration in Qikou sag should mainly focus on the middle-deep layers in exploration sections and the buried hill and deep clastic reservoir in exploration fields.And besides,research on coal-formed gas resource potential should be strengthened.
Key words: Stable isotope; Nature gas; Genetic type; Qikou sag; Huanghua depression.
Guo Jian-ying,Zhong Ning-ning,Li Jian,Wang Dong-liang,Yu Xue-min,Ma Wei . Characteristics of Carbon and Hydrogen Isotopes and Genetic Type of Hydrocarbon Gases in Qikou Sag[J]. Natural Gas Geoscience, 2011 , 22(6) : 1054 -1063 . DOI: 10.11764/j.issn.1672-1926.2011.06.1054
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