The Origin of Condensate and Oil-type Gas from Deep Reservoir in the North of Songliao Basin

FENG Zi-hui; FENG Zhi-qiang; LIU Wei; WANG Xue; GUAN Qiu-hua

The discovery of condensate and oil-type gas from deep reservoir increased the exploring potential of petroleum in the north of Songliao basin. Applying the analytical technologies of biomarker and carbon isotope of individual compounds, combining with geological background, the geochemical characteristics of condensate, oil-type gas and solid bitumen was discussed. The condensate was generated from coals and coal-measure source rocks in deep formation of the basin. The former is characterized by high content of aromatic hydrocarbon and heavy carbon isotope of individual compounds. The latter is characterized by high content of saturated hydrocarbon and light carbon isotope of individual compounds. However, the result of correlating biomarker indicates that the both condensate are derived from the same source rock-Shahezi formation. The carbon isotope of methane of oil-type gas is light, generally less than -45‰. The difference of carbon isotope between methane and ethane is obvious belonging to natural gas from oil cracking. The mixture of oil-type gas and coal-type gas in deep reservoir may be the one major reason of reverse in hydrocarbon carbon isotope series of deep natural gas. The TOC is 0. 08%-0. 16%, the HI is 49-297 mg/ g, R_o is about 1. 87% for the solid bitumen in deep volcanic reservoir. It shows that potential of generating hydrocarbon of the solid bitumen is low nowadays, oil was cracked to natural gas during the later period of high mature stage, corresponding geologic age is about the sedimentary time between the Nenjiang formation and Mingshui formation (80-65 Ma). The fact of oil transforms into natural gas enlightens that the exploration of deep natural gas should put the study of pero-reservoir into consideration.

The Origin of Condensate and Oil-type Gas from Deep Reservoir in the North of Songliao Basin

1. Jilin university, Changchun 130061;

2. Research institute of exploration and development, Daqing LTD, Daqing 163712

Received Date: 2003-10-29

Publish Date: 2004-12-10

Key words:

Abstract: The discovery of condensate and oil-type gas from deep reservoir increased the exploring potential of petroleum in the north of Songliao basin. Applying the analytical technologies of biomarker and carbon isotope of individual compounds, combining with geological background, the geochemical characteristics of condensate, oil-type gas and solid bitumen was discussed. The condensate was generated from coals and coal-measure source rocks in deep formation of the basin. The former is characterized by high content of aromatic hydrocarbon and heavy carbon isotope of individual compounds. The latter is characterized by high content of saturated hydrocarbon and light carbon isotope of individual compounds. However, the result of correlating biomarker indicates that the both condensate are derived from the same source rock-Shahezi formation. The carbon isotope of methane of oil-type gas is light, generally less than -45‰. The difference of carbon isotope between methane and ethane is obvious belonging to natural gas from oil cracking. The mixture of oil-type gas and coal-type gas in deep reservoir may be the one major reason of reverse in hydrocarbon carbon isotope series of deep natural gas. The TOC is 0. 08%-0. 16%, the HI is 49-297 mg/ g, R_o is about 1. 87% for the solid bitumen in deep volcanic reservoir. It shows that potential of generating hydrocarbon of the solid bitumen is low nowadays, oil was cracked to natural gas during the later period of high mature stage, corresponding geologic age is about the sedimentary time between the Nenjiang formation and Mingshui formation (80-65 Ma). The fact of oil transforms into natural gas enlightens that the exploration of deep natural gas should put the study of pero-reservoir into consideration.

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The Origin of Condensate and Oil-type Gas from Deep Reservoir in the North of Songliao Basin

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