Analysis of Accumulation Process of Coal-Formed Gas in Gub Buried Hill of Jiyang Depression
Received date: 2008-05-02
Revised date: 2009-07-20
Online published: 2009-10-10
According to the compositions, carbon homolog isotope and light hydrocarbon parameters of natural gas in the Gubei buried hill of Jiyang depression, we conclude that the coal formed gases are mainly from Carboniferous Permian coal measures as the source rock, and the Mesozoic coal measures do some part of contribution. Furthermore, the coal formed gases are mainly preserved in the fourth row of buried hills, as well as the north of second and third rows of buried hills which are far away from the Gubei fault. After identification of the coal formed gases' source, homogenization temperature of the fluid inclusion, as well as hydrocarbon generation kinetics, history of hydrocarbon generation and sedimentation of the source rocks, the conclusion is that there are four periods in hydrocarbon generation of Carboniferous Permian source rocks, among which the Yanshan perio d and Xishan period are the main periods, and the late Xishan period is the main period for the Mesozoic hydrocarbon source rocks. Also, there are two types of coal-formed gas pools in this area, one is the secondary gas pool formed after the primary pool of Carboniferous Permian system, which is destroyed during the Xishan period, the other is that after the secondary hydrocarbon generation of the deep Carboniferous-Permian and Mesozoic coal measure source rocks in the later Tertiary period, among which the second type will be favorable in the natural gas exploration in this area.
ZHANG Shan-Wen, ZHANG Lin-Ye, LI Zheng . Analysis of Accumulation Process of Coal-Formed Gas in Gub Buried Hill of Jiyang Depression[J]. Natural Gas Geoscience, 2009 , 20(5) : 670 -677 . DOI: 10.11764/j.issn.1672-1926.2009.05.670
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