Discussion on the Dynamic Factors Controlling HydrocarbonMigration from Depression to West Slope Zone of the Songliao Basin, Northeast China

XIANG Cai-fu; FENG Zhi-qiang; WU He-yong; XIE Xi-nong; LI Jun-hong

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Article Navigation > Acta Sedimentologica Sinica > 2005 > 23(4): 719-725

XIANG Cai-fu, FENG Zhi-qiang, WU He-yong, XIE Xi-nong, LI Jun-hong. Discussion on the Dynamic Factors Controlling HydrocarbonMigration from Depression to West Slope Zone of the Songliao Basin, Northeast China[J]. Acta Sedimentologica Sinica, 2005, 23(4): 719-725.

Citation:

Discussion on the Dynamic Factors Controlling HydrocarbonMigration from Depression to West Slope Zone of the Songliao Basin, Northeast China

1.
Basin and Reservoir Research Center of China University of Petroleum,Changping, Beijing 102249;
2.
Key Laboratory for Hydrocarbon Accumulation Mechanism,China University of Petroleum, Ministry of Education, Changping Beijing 102249;
3.
Prospecting and Exploration Institute of Daqing Oil Field, Daqing Heilongjiang 163458;
4.
Resource Faculty of China University of Geosciences(Wuhan),Wuhan 430074

Received Date: 2005-01-04
Rev Recd Date: 2005-06-01
Publish Date: 2005-12-10

Abstract

The oil recharge event defined by the K2Ar dating of the authigenic illite proved to be episodic indicated by the following two factors. First, the recharge time is clustered in the following four periods, 60Ma, 58Ma, 45Ma、and 45-32Ma. Second, the first 3 stages of oil recharge are widely sp read in the whole west slope zone of the Songliao basin. The oil-recharge event happened in two different places far away from each other (35km linearly) linked by the hydrocarbon migration pathway systems. According to the oil recharge time, the minimum hydrocarbon migration velocity is estimated to be greater than 4. 5km /Ma, which cannot be exp lained bywater dynamics and density difference between formation water and hydrocarbon. The velocity driven by the late two factors are estimated to be less than 2km /Ma, far less than the actual hydrocarbon migration velocity. Thismeans that there exist other factors that driven the hydrocarbon to migrate westward. It is suggested here that the hydrocarbon migration and concentration wasmainly controlled by the tectonic comp ression during the Paleogene. First, tectonic comp ression has p romoted the initialmigration of the hydrocarbon by strengthening the overp ressure generated in the mudrock and driven the hydrocarbon out of the microfissures generated during the basin extension. Second, the ep isodic movement of the tectonic comp ression will result in the ep isodic movement of the formation fluid, which will drive the hydrocarbon migration and concentration ep isodically. This is whatwe found in the west slope zone of the Songliao basin. Finally, tectonic compression in an E-W direction has generated many anticlines in the basin, which is the most important trap in the Songliao basin.Tectonic compression has changed the characters of the faults that striking NNE,NE,which resulted in the forming of many fault-sealed oil reservoirs in the study area.
- hydrocarbon migration,
- hydrocarbon accumulation dynamics,
- west slope zone of Songliao basin

References

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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

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Discussion on the Dynamic Factors Controlling HydrocarbonMigration from Depression to West Slope Zone of the Songliao Basin, Northeast China

1. Basin and Reservoir Research Center of China University of Petroleum,Changping, Beijing 102249;

2. Key Laboratory for Hydrocarbon Accumulation Mechanism,China University of Petroleum, Ministry of Education, Changping Beijing 102249;

3. Prospecting and Exploration Institute of Daqing Oil Field, Daqing Heilongjiang 163458;

4. Resource Faculty of China University of Geosciences(Wuhan),Wuhan 430074

Received Date: 2005-01-04

Rev Recd Date: 2005-06-01

Publish Date: 2005-12-10

Key words:

Abstract: The oil recharge event defined by the K2Ar dating of the authigenic illite proved to be episodic indicated by the following two factors. First, the recharge time is clustered in the following four periods, 60Ma, 58Ma, 45Ma、and 45-32Ma. Second, the first 3 stages of oil recharge are widely sp read in the whole west slope zone of the Songliao basin. The oil-recharge event happened in two different places far away from each other (35km linearly) linked by the hydrocarbon migration pathway systems. According to the oil recharge time, the minimum hydrocarbon migration velocity is estimated to be greater than 4. 5km /Ma, which cannot be exp lained bywater dynamics and density difference between formation water and hydrocarbon. The velocity driven by the late two factors are estimated to be less than 2km /Ma, far less than the actual hydrocarbon migration velocity. Thismeans that there exist other factors that driven the hydrocarbon to migrate westward. It is suggested here that the hydrocarbon migration and concentration wasmainly controlled by the tectonic comp ression during the Paleogene. First, tectonic comp ression has p romoted the initialmigration of the hydrocarbon by strengthening the overp ressure generated in the mudrock and driven the hydrocarbon out of the microfissures generated during the basin extension. Second, the ep isodic movement of the tectonic comp ression will result in the ep isodic movement of the formation fluid, which will drive the hydrocarbon migration and concentration ep isodically. This is whatwe found in the west slope zone of the Songliao basin. Finally, tectonic compression in an E-W direction has generated many anticlines in the basin, which is the most important trap in the Songliao basin.Tectonic compression has changed the characters of the faults that striking NNE,NE,which resulted in the forming of many fault-sealed oil reservoirs in the study area.

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Discussion on the Dynamic Factors Controlling HydrocarbonMigration from Depression to West Slope Zone of the Songliao Basin, Northeast China

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