Qu Quangong, Zhang Jingxuan, Lu Youming, Zhu Fengyun. Vertical zoning of karst formations in reservoirs with thick limestones: A case study of district 4 in Tahe Oilfield[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2015, 37(1): 17-21. doi: 10.11781/sysydz201501017
Citation: Qu Quangong, Zhang Jingxuan, Lu Youming, Zhu Fengyun. Vertical zoning of karst formations in reservoirs with thick limestones: A case study of district 4 in Tahe Oilfield[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2015, 37(1): 17-21. doi: 10.11781/sysydz201501017

Vertical zoning of karst formations in reservoirs with thick limestones: A case study of district 4 in Tahe Oilfield

doi: 10.11781/sysydz201501017
  • Received Date: 2014-07-03
  • Rev Recd Date: 2014-12-08
  • Publish Date: 2015-01-28
  • In district 4 of the Tahe Oilfield, the Ordovician Yingshan Formation was most petroliferous. Marine carbonate rocks with big thickness were widespread. Secondary pores, including dissolution pores, fractures and caves, served as the main reservoir spaces, while primary pores were poorly developed. According to modern karst hydraulic unit theory, a conceptual model of karst was established. Three palaeo-hydraulic zones were identified: vadose zone (including infiltration sub-zone and percolation sub-zone), phreatic zone and tranquil zone. The distribution of reservoirs was described using stochastic seismic inversion technology. The reservoirs were controlled by palaeo-hydraulic zones vertically and karst landforms horizontally, which was proved by field work.

     

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