Oil & Gas Geology ›› 2007, Vol. 28 ›› Issue (3): 419-426,418.doi: 10.11743/ogg20070318

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Genetic types and distribution pattern of natural gases in Gubei buried-hills,Jiyang depression

Lin Wu, Li Zheng, Li Juyuan, Xu Xingyou   

  1. Geological Scientific Research Institute of Shengli Oilfield Company, SINOPEC, Dongying, Shandong 257015
  • Received:2007-01-16 Online:2007-06-25 Published:2012-01-16

Abstract:

Research on the compositions,carbon isotope,and geochemical properties of light hydrocarbons of natural gases in Gubei buried-hills of Jiyang depression suggests that gases there are of three genetic types: oil-related gas,coal-related gas,and mixed gas.Natural gases in Well Bo-601 and Boshen-6 belong to oil-related gas,that in Well Yi-155 and Gubeigu-1 are coal-related gas,and that from Well Gubeigu-2,Bogu-4,and Yi-32 belong to mixed type.Study in combination with the geologic characteristics reveal that the carbon isotope and light hydrocarbon show certain regularities in the study area.From the first row to the fourth row of buried-hills(from west to east),the carbon isotope become progressively heavier,the values of indexes of methylcyclohexane and benzene gradually increase,and the genetic types of natural gases shift from oil-related gas to coal formed gas.It is suggested that the distribution of natural gases in the area are obviously controlled by the gas source rocks and faults in the study area.Oil-related gas is mainly concentrated in the first row of buried-hills,mixed gas is predominantly distributed in the region near the Gubei fault in southern part of the second and the third row of buried-hills,while coal-related gas is preserved in the northern part(regions far away from the Gubei fault)of the second and the third rows of buried-hills,and the fourth row of buried hills.

Key words: oil-related gas, coal-related gas, distribution pattern, genetic type of nautral gas, Gubei buried-hill belt, Jiyang depression

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