Characteristics of Natural Gas in P2ch—T1f Layers in Jiannan Gas Field and Gas Source Correlation
Received date: 2010-03-03
Revised date: 2010-05-06
Online published: 2010-12-10
Jiannan gas field is located in the carbonate open platform between troughs of Kaijiang-Liangping and Chengkou-Exi.P2ch gas reservoir with bio-reef secondary dolomite is distributed in the northern structural height.Lithology of T1f gas reservoir in the southern structural height is oncoids limestone,oolitic limestone,dolomite and aplitic limestone.Both of them have fractured-porous reservoir type.So,Jiannan gas field is subjected to oolitic shoal in inner carbonate platform.The interpretation of gas geochemistry and gas source correlation in Jiannan gas field is required for understanding the oolitic and reef reservoir in inner carbonate platform.According to chemical and carbon isotopic composition of natural gas as well as H2S content and dolomite distribution,we considered that natural gas was of mixing of coal-type and oil-type,and no inorganic gas interfusion existed.The mixed gas would be altered by thermochemical sulfate reduction (TSR).According to pattern of methane carbon isotope values and gas maturity,it is referred that natural gas would be sourced from sapropelic and humic organic matters in Permian,and little contribution of Silurian sapropelic source rocks existed.
ZHANG Jian-Yong, LIU Wen-Hui, TENG Ge-Er, WANG Xiao-Fang, ZHANG Jing-Yi . Characteristics of Natural Gas in P2ch—T1f Layers in Jiannan Gas Field and Gas Source Correlation[J]. Natural Gas Geoscience, 2010 , 21(6) : 1004 -1013 . DOI: 10.11764/j.issn.1672-1926.2010.06.1004
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