Relationship between Oil and Gas of Bio-, Thermo-catalytic Transitional Zone

Liu Wenhui; Xu Yongchang

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Article Navigation > Acta Sedimentologica Sinica > 1995 > 13(2): 4-13

Liu Wenhui, Xu Yongchang. Relationship between Oil and Gas of Bio-, Thermo-catalytic Transitional Zone[J]. Acta Sedimentologica Sinica, 1995, 13(2): 4-13.

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Liu Wenhui, Xu Yongchang. Relationship between Oil and Gas of Bio-, Thermo-catalytic Transitional Zone[J]. Acta Sedimentologica Sinica, 1995, 13(2): 4-13.

Relationship between Oil and Gas of Bio-, Thermo-catalytic Transitional Zone

Lanzhou Institute of Geology, Academia Sinica, 730000

Received Date: 1994-10-15
Publish Date: 1995-06-10

Abstract

Carbon isotopic compositions of crude oil and natural gas can similarly indicate their characteristics of association. In this paper, types of oil - gas assemblage are classified based on the data of isotopic compositions of crude oil and natural gases in Liaohe Oilfield, of which hydrocarbon geochemistry has been studied well.With the study of Liaohe Oilfield, the relationship of the oil - gas isotopic composition of bio, thermo catalytic transitional zone (BTCTZ) in China is researched systematically and their types of oil - gas assemblage are divided, and the geochemical characteristics of different oil - gas assemblages for BTCTZ are discussed as well.According to the carbon isotopic composition of oils and methane and ethane of gases as well as to the geologic setting of Liaohe Basin, four types of oil - gas assemblages are divided, i. e., (1) the oil - gas assemblage of similar evolutionary stage and congenetic sapropel matters; (2) the assemblage of similar evolutionary stage of sapropel - humus matters; (3) the assemblage of similar evolutionary stage from homologous humus and (4) the oil- gas assemblage of mixture that the oils and gases would come from congenetic organic matters but different evolutionary stage, or similar evolutionary stage but different type of organic matters,or different matters with different evolutionary stage. All of the assemblages can be subdivided in terms of their evolutionary stage of the organic matter and have specific geochemical features and relationship of the isotopic compositions. From all of the assemblages, the oil - gas associations of different BTCTZ are researched emphatically.Because oil and gas from the same type and evolutionary stage of organic matter take corresponding distribution pattern of the carbon and hydrogen isotopic composition, the varied difference of them may identify the features of oil and gas generated from different type and evolutionary stage of organic matter. The systematic study of numerous oil and gas isotope data from more than ten sedimentary basins in China showsthat there are four oil - gas assemblages of BTCTZ, which are listed as follows:(1) The oil - gas assemblage of BTCTZ of sapropel organic matter. Its BTCTZ gas and immature - lowmature oil sourced from the same sapropel matter during similar evolutionary stage. its indictors are δ¹³C₁ between - 52～- 45‰, δ13'Coil below - 28‰, δ¹³C₂ below- 30‰, δDCH₄ below - 250‰ and δDoil below -160‰.(2) The oil- gas assemblage of BTCTZ of sapropel - humic organic matter. It resembles type (1) but organic matter is sapropel - humus and δ¹³C₁ between - 52～- 45‰, δ13Coil between - 28～- 25‰, δ¹³C₂ between - 38～-26‰, δDCH₄ between - 280～- 180‰ and δDoil between - 180～- 120‰.(3) The assemblage of BTCTZ gas from humus and oil from saporpel matter. This kind of gas is BTCTZ gas produced by humic organic matters and the oil may be from saropel - humic orgonic matter during the higher eviutionary stage. its isotopic compositions are δ¹³C₁ between - 60～- 52‰, δ13Ciol between - 28～- 25‰.(4)The assemblage of BTCTZ gas from sapropel - humic organic matter and oil from saporpel matter.It's gas and oil originated from the same organic matter or different organic matters, but the evolutionary stage for oil was little higher than that for gas, and the mixture feature is obvious. Its carbon isotopic compositions are δ¹³C₁ between - 60～- 52‰, and δ13Coil beolw - 28‰.The studies of isotopic composition relationship between gases and oils lead us to understand more about the origin and evolution of natural gas, particularly of BTCTZ gas. With the studies in this paper, it can be seen that almost all gases and oils in BTCTZ are the results of evolution from congeneitic matter in the same stage, and the existence of gases and oils in BTCTZ has been verified. It also corrects the concept that the BTCTZ gas was mixtule of biogenic gas and thermocatalytic gas. The studies show that the BTCTZ is an important stratum for oil and gas accumulation during the evolution of organic m

References

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1.徐永昌、沈平、刘文汇、王万春，1990，一种新的天然气成因类型—生物一热催化过渡带气，中国科学(B辑>.(9):975-980。

2.黄第藩、廖前进、徐永昌，1988，未成熟石油成因的初步研究，中国科学院兰州地质研究所生物、气体地球化学开放研究实验室1987研究年报，兰州:甘肃科学技术出版社，1-19。

3.刘文汇，1994，生物一热催化过渡带气与油气的早期形成，石油地质，10(1):34-42。

4.Petersen, N. F. and Hickey. P. J.，1987. California Plio一Miocene Oils Evidence of Early Generation, in AAPG Studies in Geology. 25:351一360.

5.Connan, J. and Coustau. H.，1987. Influence of the Geological and Geochemical Characteristics of Heavy Oils on their Recovery. AAPG in Studies in Geology, 25:261一279.

6.黄第藩、李晋超,1987，陆相沉积中未熟石油及其意义，石油学报，(1):1-90。

7.刘文汇，1993，油气的早期形成与聚集，天然气地球科学，4(6):8-26。

8.刘文汇，1994，生物一热催化过渡带天然气地化特征，石油勘探与开发，21(2):108-109。

9.徐永昌、刘文汇、沈平等，1993，辽河盆地夭然气的形成与演化，北京:科学出版社。

10.Snowdon, L. R. and Powell. T. G.，1982, Immature oil and condensate modification of hydrocarbon generation model for terrestrial organic matter, AAPG. 66:775一788.

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Relationship between Oil and Gas of Bio-, Thermo-catalytic Transitional Zone

Lanzhou Institute of Geology, Academia Sinica, 730000

Received Date: 1994-10-15

Publish Date: 1995-06-10

Abstract: Carbon isotopic compositions of crude oil and natural gas can similarly indicate their characteristics of association. In this paper, types of oil - gas assemblage are classified based on the data of isotopic compositions of crude oil and natural gases in Liaohe Oilfield, of which hydrocarbon geochemistry has been studied well.With the study of Liaohe Oilfield, the relationship of the oil - gas isotopic composition of bio, thermo catalytic transitional zone (BTCTZ) in China is researched systematically and their types of oil - gas assemblage are divided, and the geochemical characteristics of different oil - gas assemblages for BTCTZ are discussed as well.According to the carbon isotopic composition of oils and methane and ethane of gases as well as to the geologic setting of Liaohe Basin, four types of oil - gas assemblages are divided, i. e., (1) the oil - gas assemblage of similar evolutionary stage and congenetic sapropel matters; (2) the assemblage of similar evolutionary stage of sapropel - humus matters; (3) the assemblage of similar evolutionary stage from homologous humus and (4) the oil- gas assemblage of mixture that the oils and gases would come from congenetic organic matters but different evolutionary stage, or similar evolutionary stage but different type of organic matters,or different matters with different evolutionary stage. All of the assemblages can be subdivided in terms of their evolutionary stage of the organic matter and have specific geochemical features and relationship of the isotopic compositions. From all of the assemblages, the oil - gas associations of different BTCTZ are researched emphatically.Because oil and gas from the same type and evolutionary stage of organic matter take corresponding distribution pattern of the carbon and hydrogen isotopic composition, the varied difference of them may identify the features of oil and gas generated from different type and evolutionary stage of organic matter. The systematic study of numerous oil and gas isotope data from more than ten sedimentary basins in China showsthat there are four oil - gas assemblages of BTCTZ, which are listed as follows:(1) The oil - gas assemblage of BTCTZ of sapropel organic matter. Its BTCTZ gas and immature - lowmature oil sourced from the same sapropel matter during similar evolutionary stage. its indictors are δ¹³C₁ between - 52～- 45‰, δ13'Coil below - 28‰, δ¹³C₂ below- 30‰, δDCH₄ below - 250‰ and δDoil below -160‰.(2) The oil- gas assemblage of BTCTZ of sapropel - humic organic matter. It resembles type (1) but organic matter is sapropel - humus and δ¹³C₁ between - 52～- 45‰, δ13Coil between - 28～- 25‰, δ¹³C₂ between - 38～-26‰, δDCH₄ between - 280～- 180‰ and δDoil between - 180～- 120‰.(3) The assemblage of BTCTZ gas from humus and oil from saporpel matter. This kind of gas is BTCTZ gas produced by humic organic matters and the oil may be from saropel - humic orgonic matter during the higher eviutionary stage. its isotopic compositions are δ¹³C₁ between - 60～- 52‰, δ13Ciol between - 28～- 25‰.(4)The assemblage of BTCTZ gas from sapropel - humic organic matter and oil from saporpel matter.It's gas and oil originated from the same organic matter or different organic matters, but the evolutionary stage for oil was little higher than that for gas, and the mixture feature is obvious. Its carbon isotopic compositions are δ¹³C₁ between - 60～- 52‰, and δ13Coil beolw - 28‰.The studies of isotopic composition relationship between gases and oils lead us to understand more about the origin and evolution of natural gas, particularly of BTCTZ gas. With the studies in this paper, it can be seen that almost all gases and oils in BTCTZ are the results of evolution from congeneitic matter in the same stage, and the existence of gases and oils in BTCTZ has been verified. It also corrects the concept that the BTCTZ gas was mixtule of biogenic gas and thermocatalytic gas. The studies show that the BTCTZ is an important stratum for oil and gas accumulation during the evolution of organic m

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Relationship between Oil and Gas of Bio-, Thermo-catalytic Transitional Zone

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