Petroleum Origination from Source Bed and Formation in Reservoir Bed

Abstract

Abstract: In view of the shortage of theory of petroleum genesis, this paper proposes a new theory of petroleum genesis, which considers that hydrocarbons originate from source bed and form within the reservoir bed. In the burial process of biological organic matter, at early period of diagenesis, some of the polarity organic matter was expelled from the source bed with pore water, and then gradually became hydrocarbons within reservoir by thermal action. This paper discusses the differences between this new theory and the early or late organic genesis theories. This new theory can be used to make a good explanation of genesis of immature oil, avoid the problem that late hydrocarbon expulsion is difficult, and explain that the source rocks below "depth without hydrocarbons" can still generate some hydrocarbons. Also, it is presumed that the source rocks could not generate large numbers of hydrocarbons with increase of its vitrinite reflectance (Ro).

Key words: petroleum genesis, source rock, immature oil, maturation, reservoir bed

CLC Number:

TE112.111

LI Shui-fu. Petroleum Origination from Source Bed and Formation in Reservoir Bed[J]. Xinjiang Petroleum Geology, 2008, 29(1): 113-116.

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