RELATIONSHIP BETWEEN MAGMA ACTIVITY AND CO<sub>2</sub> GAS ACCUMULATION IN FUSHAN DEPRESSION, BEIBUWAN BASIN

LI Mei-jun; LU Hong; WANG Tie-guan;WU Wei-qiang; LIU Ju;GAO Li-hui

doi:10.11764/j.issn.1672-1926.2006.01.55

Natural Gas Geoscience >

2006 , Vol. 17 >Issue 1: 55 - 59

DOI: https://doi.org/10.11764/j.issn.1672-1926.2006.01.55

RELATIONSHIP BETWEEN MAGMA ACTIVITY AND CO₂ GAS ACCUMULATION IN FUSHAN DEPRESSION, BEIBUWAN BASIN

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1.Key Laboratory for Hydrocarbon Accumulation Mechanism of Education Ministry, China University of Petroleum,Beijing 102249, China; 2.Guangzhou Organic Geochemical Research Institute of CAS, Guangzhou 510640, China;3.South Oil Exploration and Development Company of PetroChina, Guangzhou 510640, China

Received date: 2005-08-01

Revised date: 2005-11-13

Online published: 2006-02-20

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Abstract

Natural gas pools with high content of CO₂ were discovered during the hydrocarbon exploration in Fushan depression,Beibuwan basin.The carbon isotopic composition of CO₂,Helium and Argon isotopic composition of noble gas indicate that the CO₂ is curst-mantal source.Magma activities frequently occurred since Cenozoic.In this area.The first epoch associated by Zhuqiong Motion,occurred in 45 Ma with basalt eruption and part of diabase formed by shallow intrusion.The next three epochs occurred in 30,10~5 and 1Ma associated by Nanhai and Dongsh a Motions respectively. The basalt and diabase of Liushagang formed in Eocene ma inly occur in Huachang, F8 and F10 blocks, which just coincide with the occurren ce of natural pools with high contents of CO₂. This indicates that the magma activity occurred in Eocene is the mainly controlling factors that caused the ge neration and accumulation of CO₂ gas. The difference between the third member and the first member of Liushagang Formation in CO₂ accumulation indicate tha t the distribution and activity of fault systems is another important factors th at controls the accumulation of CO₂. 

Key words： CO₂pool; Magma activity; Faults; Fushan depression; Beibuwan basin.

Cite this article

LI Mei-jun; LU Hong; WANG Tie-guan;WU Wei-qiang; LIU Ju;GAO Li-hui . RELATIONSHIP BETWEEN MAGMA ACTIVITY AND CO₂ GAS ACCUMULATION IN FUSHAN DEPRESSION, BEIBUWAN BASIN[J]. Natural Gas Geoscience, 2006 , 17(1) : 55 -59 . DOI: 10.11764/j.issn.1672-1926.2006.01.55

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