Condition of Xujiahe Formation Large Gas Province Formation in Sichuan Basin

YI Shi-wei，LIN Shi-guo，YANG Wei，SHI Zhen-sheng，LI Jun

doi:10.11764/j.issn.1672-1926.2013.01.1

Natural Gas Geoscience >

2013 , Vol. 24 >Issue 1: 1 - 8

DOI: https://doi.org/10.11764/j.issn.1672-1926.2013.01.1

Condition of Xujiahe Formation Large Gas Province Formation in Sichuan Basin

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1.Langfang Branch,Research Institute of Petroleum Exploration and Development,PetroChina,Langfang 065007,China; 2.School of Energy Resources,China University of Geosciences (Beijing),Beijing 100083,China

Received date: 2012-10-09

Revised date: 2012-12-17

Online published: 2013-02-10

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Abstract

Xujiahe Formation tight gas in the Sichuan basin,which is controlled by lithology distribution,is characterized as wide area,large scale,and low abundance.It has already discovered the trillions of cubic meters large gas province.What are the main control-factors that forming the large gas province? According to exploration practice,the large area distribution of source rocks is prone to form the wide overlap type hydrocarbon generation,the large area discontinuous distribution of reservoir is easy to do the wide overlap type accumulate hydrocarbon,the large area distribution of seal makes the wide overlap type cover hydrocarbon,and the mille-feuille style assemblage of source-reservoir-seal constitutes the wide overlap type combination.The key factors to forming large gas province are continuous hydrocarbon generation of source rocks and continuous supplying,and the continuous sealing under the stable structure setting.Wide interbedding type combination of source rock,reservoir and seal causes a large area of direct contact between reservoir and source rocks and wide multiple accumulation of gas.The multiple accumulation as well as source rock continuous supplying and continuous stable save result in the different layers and different types of gas pools to form large area overlapped multiple accumulation distribution,which is formation of large gas province.

Key words： Large gas province; Wide overlap type hydrocarbon generation; Wide overlap type hydrocarbon accumulate; Wide overlap type hydrocarbon cover; Wide interbedding type combination of source-reservoir-seal; Hydrocarbon wide multiple accumulation; Xujiahe Formation; Sichuan basin

Cite this article

YI Shi-wei，LIN Shi-guo，YANG Wei，SHI Zhen-sheng，LI Jun . Condition of Xujiahe Formation Large Gas Province Formation in Sichuan Basin[J]. Natural Gas Geoscience, 2013 , 24(1) : 1 -8 . DOI: 10.11764/j.issn.1672-1926.2013.01.1

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