Hydrocarbon Inclusions: Implications to Petroleum Geology and Geochemistry

Pan Changchun; Zhou Zhongyi; Xie Qilai

In this paper, a practical approach is presented to classify the hydrocarbon and hydrocarbon bearing inclusions based on recent studies published by others as well as the authors' own research experience in this field. The properties of fluid phases, compositions and homogenization temperatures of various types of hydrocarbon and hydrocarbon bearing inclusions have been described and studied in details. In a reservoir, the higher the homogenization temperatures of the oil inclusions, the higher the contents of gas and volatile short chain compounds. Based on the variation of homogenization temperatures and the relationship of homogenization temperatures between oil inclusions and associated aqueous inclusions, the variation of contents of gas and volatile short chain compounds in a reservoir could be elucidated.Furthermore, the efficiency and limitation of the method to determine the entrapment temperatures and pressures of fluid inclusions based on PVT diagrams of oil inclusions and associated aqueous inclusions are evaluated. Finally, some possible models have been presented to interpret the entrapments of various types of hydrocarbon and hydrocarbon bearing inclusions and their implications to petroleum geology and geochemistry are discussed as well.

Gangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640

Received Date: 1995-05-06

Publish Date: 1996-12-10

Key words:

hydrocarbon-bearing basin /
hydrocarbon and hydrocarbon bearing inclusion /
homogenization temperature /
Compositional evolution of oil gas reservair

Abstract: In this paper, a practical approach is presented to classify the hydrocarbon and hydrocarbon bearing inclusions based on recent studies published by others as well as the authors' own research experience in this field. The properties of fluid phases, compositions and homogenization temperatures of various types of hydrocarbon and hydrocarbon bearing inclusions have been described and studied in details. In a reservoir, the higher the homogenization temperatures of the oil inclusions, the higher the contents of gas and volatile short chain compounds. Based on the variation of homogenization temperatures and the relationship of homogenization temperatures between oil inclusions and associated aqueous inclusions, the variation of contents of gas and volatile short chain compounds in a reservoir could be elucidated.Furthermore, the efficiency and limitation of the method to determine the entrapment temperatures and pressures of fluid inclusions based on PVT diagrams of oil inclusions and associated aqueous inclusions are evaluated. Finally, some possible models have been presented to interpret the entrapments of various types of hydrocarbon and hydrocarbon bearing inclusions and their implications to petroleum geology and geochemistry are discussed as well.

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Reference (1)

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Hydrocarbon Inclusions: Implications to Petroleum Geology and Geochemistry

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