Genesis of the Natural Gas in Tight Condensate Gas Reservoirsand Forming Model,Wenchang A Sag of Pearl River Mouth Basin

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    (Zhanjiang Branch of CNOOC Ltd.,Zhanjiang 524057,China

Received date: 2013-10-18

  Revised date: 2014-01-01

  Online published: 2014-09-10

Abstract

Based on the test and seismic data etc.,genesis of the natural gas in the low permeability condensate gas reservoirs of the Upper Oligocene Zhuhai Formation and their formation model are restudied through hydrocarbon geochemistry and pool-formation research method.The natural gas was dominated by hydrocarbon gas and belongs to mature oil-type gas,which differentiated from typical coal-derived gas of Yacheng13-1 Gasfield in Ying-Qiong Basin,and was generated from Lower Oligocene Enping Formation lacustrine source rocks.Evidences showed that large-scale shallow lacustrine source rocks with good type of organic matter developed during Enping Period.Since 5Ma,natural gas which formed from Enping Formation source rocks charged into Zhuhai Formation with low permeability by deep burial.Abundant gas resource,high differential pressure between source rocks and reservoir rock and straightway migration path are the main controlling factors of the Zhuhai Formation tight gas reservoirs.
 

Cite this article

ZHANG Ying-zhao,XU Xin-de,YOU Li,YUAN Bing,GAN Jun,LI Hui,DENG Guang-jun . Genesis of the Natural Gas in Tight Condensate Gas Reservoirsand Forming Model,Wenchang A Sag of Pearl River Mouth Basin[J]. Natural Gas Geoscience, 2014 , 25(9) : 1320 -1328,1450 . DOI: 10.11764/j.issn.1672-1926.2014.09.1320

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