Genesis and Accumulation Period of the CO<span><sub>2 </sub>in Changling Fault Depression of Songliao Basin, Northeastern China</span>

MI  Jing-Kui, ZHANG  Shui-Chang, DAO  Shi-Zhen, LIU  Ting, LUO  Xia

doi:10.11764/j.issn.1672-1926.2008.04.452

Natural Gas Geoscience >

2008 , Vol. 19 >Issue 4: 452 - 456

DOI: https://doi.org/10.11764/j.issn.1672-1926.2008.04.452

Genesis and Accumulation Period of the CO₂in Changling Fault Depression of Songliao Basin, Northeastern China

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（1. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China;2. Langfang Branch, Research Institute of Petroleum Exploration and Development, PetroChina, Langfang 065007, China）

Online published: 2008-04-20

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Abstract

Changling fault depression is one of the gas rich areas in the Songliao basin, north\|eastern China. The probable reserve of natural gas is up to 2×108 m3. Geochemical analyses of the gas compositions in the inclusions and the carbon isotope and the study on regional geology and structural history reveal that the CO2 in this area is mantle derived origin and could not be from the degassification of volcanic rocks in Yingcheng formation.The accumulation period of CO2 is in later Cenozoic. There is no CO2 inclusions grown in reservoir rocks for two reasons. Firstly, the inclusions could not be enclosed by authigenic mineral for fast jnjection of CO2 which related with volcanic event. Secondly, the CO2 inclusion could not be formed without water in the pore space of reservoir, for the space had been full of hydrocarbon gases when CO2 injected.

Key words： Songliao basin; Changling fault depression; CO2 genesis; Period of gas pool formation; Isotope of inclusion gases.

Cite this article

MI Jing-Kui, ZHANG Shui-Chang, DAO Shi-Zhen, LIU Ting, LUO Xia . Genesis and Accumulation Period of the CO₂in Changling Fault Depression of Songliao Basin, Northeastern China[J]. Natural Gas Geoscience, 2008 , 19(4) : 452 -456 . DOI: 10.11764/j.issn.1672-1926.2008.04.452

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