Nie Fengjun, Jiang Meizhu, Li Sitian. Petroleum migration system in Zhu Ⅲ Depression, Pearl River Mouth Basin, South China Sea[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2011, 33(4): 392-401. doi: 10.11781/sysydz201104392
Citation: Nie Fengjun, Jiang Meizhu, Li Sitian. Petroleum migration system in Zhu Ⅲ Depression, Pearl River Mouth Basin, South China Sea[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2011, 33(4): 392-401. doi: 10.11781/sysydz201104392

Petroleum migration system in Zhu Ⅲ Depression, Pearl River Mouth Basin, South China Sea

doi: 10.11781/sysydz201104392
  • Received Date: 2010-09-03
  • Rev Recd Date: 2011-06-16
  • Publish Date: 2011-08-28
  • Analyses of seismic profile,gamma ray and acoustic loggings have indicated that petroleum migration system in the Zhu Ⅲ Depression of the Pearl River Mouth Basin is composed of deep fault,unconformity and marine sandstone with high porosity and permeability.The EW oriented structural belt Ⅱ and the southern fault remain active for long time,providing pathways for vertical migration in the WC9-1,WC9-2 and WC19-1 oil-and-gas fields.Tests of inclusion show that temperature decreases from the lower to the upper formation,which may prove vertical migration.Regional unconformities have been found at the bottom of Zhuhai and Zhujiang Formations.Sandstones of TST deposit on the unconformities.Due to favorable porosity and permeability as well as lateral connectivity,the sandstones provide excellent pathways for petroleum migration.According to seismic data,there are 2 obvious NW-SE oriented structural ridges on the T4 and T5 structural planes.Fault,unconformity and sandstone under the ridges form highly effective migration system for the WC13-1 and WC13-2 oilfields in the Wenchang B Sag.

     

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