Origin of Reversal of δ13C Series and Component of Biogenic Alkane Gas in Moxi Gas Field of Central Sichuan

Abstract

Abstract: In normal state, δ¹³C in biogenic alkane gas increases, while its component content decreases, with increase of the carbon numbers. In Section-1 gas pool of Leikoupo formation of Middle Triassic in Moxi gas field of central Sichuan, both of the component content andδ¹³C series appear reversals. This paper analyzes the possible origins such as mixed origin, biologic origin, oil-cracked origin, migrated origin and leaked origin in detail. It is believed that such reversals in the gas field are primarily resulted from leaked origin. In adjacent Weiyuan gas field such reversals are also found. The research shows that it possibly attributes to the leaked origin.

Key words: Moxi gas field, alkane, carbon isotope, component, origin

CLC Number:

TE112.1

LI Deng-hua, WANG Ze-cheng, LI Jun. Origin of Reversal of δ¹³C Series and Component of Biogenic Alkane Gas in Moxi Gas Field of Central Sichuan[J]. Xinjiang Petroleum Geology, 2006, 27(6): 699-702.

References

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Origin of Reversal of δ¹³C Series and Component of Biogenic Alkane Gas in Moxi Gas Field of Central Sichuan

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