济阳坳陷孤北潜山带天然气成因类型及分布规律

doi:10.11743/ogg20070318

摘要/Abstract

摘要：

对孤北潜山带天然气组分、碳同位素及轻烃地球化学特征的研究表明,孤北潜山带天然气主要有3种成因类型,即油型气,煤型气和混合气。其中,义155、孤北古1井天然气为煤型气,渤601、渤深6井天然气为油型气,孤北古2、渤古4、义132等井天然气为油型气与煤型气的混合气。结合该区地质特征研究认为,孤北潜山带天然气碳同位素和轻烃呈规律性变化,自西向东从第一排山至第四排山碳同位素逐渐变重,甲基环己烷指数和苯指数逐渐增大,天然气成因类型从油型气过渡到煤型气。结果显示,该区天然气的分布明显受气源岩和断层的控制,其中油型气主要分布在第一排山,油型气与煤型气的混合气分布在第二、第三排山南部靠近孤北断层地区,煤型气主要分布于第二、第三排山北部远离孤北断层地区及第四排山。

关键词: 油型气, 煤型气, 分布规律, 天然气成因类型, 孤北潜山带, 济阳坳陷

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

中图分类号:

TE112.1

林武,李政,李钜源,等. 济阳坳陷孤北潜山带天然气成因类型及分布规律[J]. 石油与天然气地质, 2007, 28(3): 419-426,418. doi: 10.11743/ogg20070318 Lin Wu,Li Zheng,Li Juyuan,et al. Genetic types and distribution pattern of natural gases in Gubei buried-hills,Jiyang depression[J]. Oil & Gas Geology, 2007, 28(3): 419-426,418. doi: 10.11743/ogg20070318

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