Quantitative Evaluation Method of Secondary Hydrocarbon Generation and Its App lication in Bohai Bay basin

GUAN De-shi; WANG Zhao-yun; QIN Yong; CHENG Ke-ming

Palaeozoic source rocks developed in Bohai Bay basin have the characteristics of multiple-burial, abnormally heated, secondary hydrocarbon generation, and multip le-reservoir formation. Based on the artificial simulation on secondary hydroca rbon generation and pyrolysis simulation on samples of different maturity, it is indicated that the evolution passway of secondary hydrocarbon gen eration do not follow the Tissot's model of continuous hydrocarbon generation. T h e obvious characteristics of secondary hydrocarbon generation is the lag effect and the degree of lag is related to the original maturity. The degree of lag is the least while R o is about 0.9%. This is determined by chemical kinetic m echanism. The activation energy distribution of secondary hydrocarbon generation indicate s that the intermediate products formed in the first hydrocarbon generation are not totally decomposed, and rapidly decomposed at the beginning of secondary hy drocar bon generation, but the chemical structure of kerogen quite solidify when cooled and become activated again during the secondary hydrocarbon generation. So the evolvement of secondary hydrocarbon generation present discontinuous pulse progr e ssion. According to the lag plate of secondary hydrocarbon generation and the ge ological condition of Bohai Bay basin, through the study of the history and stag e of hydrocarbon generation, and analyzing the obvious depth and ratio of secon dary h ydrocarbon generation, prospective areas of secondary hydrocarbon generation can be pointed out.

Quantitative Evaluation Method of Secondary Hydrocarbon Generation and Its App lication in Bohai Bay basin

1. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640;

2. Scientific Research Institute of Petroleum Exploration and Development, Beiji ng 100083;

3. China University of Mining and Technology, Xuzhou Jiangsu 221008

Received Date: 2002-03-20

Rev Recd Date: 2003-04-10

Publish Date: 2003-09-10

Key words:

Abstract: Palaeozoic source rocks developed in Bohai Bay basin have the characteristics of multiple-burial, abnormally heated, secondary hydrocarbon generation, and multip le-reservoir formation. Based on the artificial simulation on secondary hydroca rbon generation and pyrolysis simulation on samples of different maturity, it is indicated that the evolution passway of secondary hydrocarbon gen eration do not follow the Tissot's model of continuous hydrocarbon generation. T h e obvious characteristics of secondary hydrocarbon generation is the lag effect and the degree of lag is related to the original maturity. The degree of lag is the least while R o is about 0.9%. This is determined by chemical kinetic m echanism. The activation energy distribution of secondary hydrocarbon generation indicate s that the intermediate products formed in the first hydrocarbon generation are not totally decomposed, and rapidly decomposed at the beginning of secondary hy drocar bon generation, but the chemical structure of kerogen quite solidify when cooled and become activated again during the secondary hydrocarbon generation. So the evolvement of secondary hydrocarbon generation present discontinuous pulse progr e ssion. According to the lag plate of secondary hydrocarbon generation and the ge ological condition of Bohai Bay basin, through the study of the history and stag e of hydrocarbon generation, and analyzing the obvious depth and ratio of secon dary h ydrocarbon generation, prospective areas of secondary hydrocarbon generation can be pointed out.

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Reference (7)

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Quantitative Evaluation Method of Secondary Hydrocarbon Generation and Its App lication in Bohai Bay basin

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