Preservation Condition and Occurrence of the Gas Pools in the Bohai Bay Area

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  • 1.State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum,Beijing 102249,China;2.Key Laboratory of Tectonics and Petroleum Resources,Ministry of Education,China University of Geosciences,Wuhan 430074,China;3.Tianjin Branch of CNOOC Limited,Tianjin 300452,China

Received date: 2014-02-19

  Revised date: 2014-07-15

  Online published: 2015-01-10

Abstract

A series of big-medium sized oil fields have been found in the Bohai Bay area,but the proved reserve of gas is very small.It developed multiple sets of mature source rocks,which are abundant enough for the formation of big-medium sized gas fields,thus preservation condition is a vital factor in the gas accumulation.Whether the gas could be preserved or not depends mainly on two key elements.They are(1)faulting intensity during the Neotectonism and density of the secondary faults in cap-rocks;(2)thickness of the cap-rocks and drops of the displacement pressures and overpressures between cap-rocks and reservoirs(DPCR).In the Liaodong Bay province,density and activity intensity of the faults developed during the Neotectonism are very little and DPCRs of the Paleogene reservoirs are very high,so the gas pools are well preserved in the Paleogene.Today,the two biggest gas fields in the Bohai Bay area just occur in the Liaodong Bay province.In contrast,in the Bozhong province,plenty of petroleum has migrated into the Neogene reservoirs through the intense activity faults.However,because of poor sealing property of the Neogene cap-rocks,most of the gas pools have suffered damage,whereas some of the pools in the Paleogene are preserved owing to the excellent Paleogene cap-rocks.So far,6 gas fields with reserves about several billion cubic meters have been found in the Paleogene of the Bozhong province.

Cite this article

TENG Chang-yu,ZOU Hua-yao,HAO Fang,WANG Ying-bin,WANG Qi . Preservation Condition and Occurrence of the Gas Pools in the Bohai Bay Area[J]. Natural Gas Geoscience, 2015 , 26(1) : 71 -80 . DOI: 10.11764/j.issn.1672-1926.2015.01.0071

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