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25th International Meeting on Organic Geochemistry IMOG 2011

25th International Meeting on Organic Geochemistry IMOG 2011

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P-351<br />

The releasing of covalently-bound biomarkers via<br />

hydropyrolysis for the bitumen-source correlati<strong>on</strong> of Majiang<br />

paleo-reservoir<br />

Fang Yunxin, Geng Ans<strong>on</strong>g, Liao Yuh<strong>on</strong>g, Wu Liangliang<br />

Guangzhou Institute of <strong>Geochemistry</strong>,Chinese Academy of Sciences, Guangzhou, China (corresp<strong>on</strong>ding<br />

author:asgeng@gzb.ac.cn)<br />

There are different viewpoints <strong>on</strong> the bitumensource<br />

correlati<strong>on</strong> of Majiang paleo-reservoir in the<br />

Southern Guizhou Depressi<strong>on</strong> of China. Three<br />

potential source rocks in this depressi<strong>on</strong> could be<br />

inferred: the Lower-Cambrian marine mudst<strong>on</strong>e,<br />

Lower-Silurian shale and Lower-Permian mudst<strong>on</strong>e.<br />

Most of the potential source rocks and solid bitumens<br />

are of high maturity. The low yields of extracts from<br />

bitumens and source rocks in Majiang area can not<br />

satisfy the detecti<strong>on</strong> limit of analytical instruments,<br />

such as GC-MS and GC-IRMS. And the severe<br />

thermal alterati<strong>on</strong>s obscure oil-source correlati<strong>on</strong>s by<br />

routine biomarkers of extracts. Routine biomarkers in<br />

EOM of source rocks and solid bitumen, such as<br />

C27~C29-regular steranes and C31~C35 homohopanes,<br />

may be altered during maturati<strong>on</strong>. Due to all these<br />

factors, it is difficult to use routine biomarkers of<br />

extracts for the bitumen-souce correlati<strong>on</strong>.<br />

Catalytic hydropyrolsis refers to pyrolysis assisted<br />

by high hydrogen pressure (15 MPa) and a dispersed<br />

sulfided molybdenum catalyst, which permits covalent<br />

b<strong>on</strong>d cleavage at relatively low temperature (

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