Characteristics of the Natural Gas Occurrence and Analysis of the Main Gas Source in the No.5 Tectonic Zone of Nanpu Sag

GANG Wen-zhe，JIANG Ya-li，GAO Gang，DONG Yue-xia

doi:10.11764/j.issn.1672-1926.2015.05.0805

2015 , Vol. 26 >Issue 5: 805 - 812

DOI: https://doi.org/10.11764/j.issn.1672-1926.2015.05.0805

Characteristics of the Natural Gas Occurrence and Analysis of the Main Gas Source in the No.5 Tectonic Zone of Nanpu Sag

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1.College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;
2.The Fourth Oil Production Plant of PetroChina Huabei Oilfield Company,Langfang 065000,China;
3.PetroChina Jidong Oilfield Company,Tangshan 063004,China

Received date: 2014-11-03

Revised date: 2014-12-25

Online published: 2015-05-10

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Abstract

Based on geological and geochemical methods,geochemical characteristics of natural gas,distribution of genetic types and gas source were studied accurately,and the distribution characteristics of natural gas were identified in the No.5 tectonic zone of Nanpu Sag.The natural gas in the onshore Beipu zone mainly distributed in the Ed Fomation and the beach area in the Es Formation.The natural gas is dominated by wet gas with little amount of dry gas.It is mainly of oil-soluble gas,followed by condensate gas.The types of natural gas are not the same in different areas.The sapropelic natural gas mainly distributes in the Ed Formation in the onshore Beipu zone,while the humic gas distributes in the Es Formation in the beach area.By comparison with geological and geochemical analyses,the humic natural gas and the transited-type natural gas is mainly sourced from the Es₃ Formation of beach area in the No.5 tectonic zone of Nanpu Sag,the sapropic natural gas in the onshore Beipu zone is mainly drived from the Es₃ Formation of Beipu zone.In general,natural gas in the No.5 tectonic zone of Nanpu Sag are mainly sourced from the middle or deep source rocks of Es₃ Formation.Natural gas uauslly migrates and accumulates near the source in the No.5 tectonic zone of Nanpu Sag.

Key words： Natrual gas; Occurrence characteristics; Gas source analysis; Nanpu Sag

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GANG Wen-zhe，JIANG Ya-li，GAO Gang，DONG Yue-xia . Characteristics of the Natural Gas Occurrence and Analysis of the Main Gas Source in the No.5 Tectonic Zone of Nanpu Sag[J]. Natural Gas Geoscience, 2015 , 26(5) : 805 -812 . DOI: 10.11764/j.issn.1672-1926.2015.05.0805

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