Original Article

Petroleum Geology & Experiment

, 37:3

First online:

Open Access This content is freely available online to anyone, anywhere at any time.

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

  • Quangong QuAffiliated withSchool of Energy Resources, China University of GeosciencesGeological Scientific Research Institute, SINOPEC Shengli Oilfield Company
  • , Jingxuan ZhangAffiliated withGeological Scientific Research Institute, SINOPEC Shengli Oilfield Company
  • , Youming LuAffiliated withOffshore Oil Production Factory, SINOPEC Shengli Oilfield Company
  • , Fengyun ZhuAffiliated withResearch Center of Western New Prospect, SINOPEC Shengli Oilfield Company

Abstract

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.

Key words:

karst zoning stochastic seismic inversion reservoir development rule Yingshan Formation Ordovician Tahe Oilfield

厚层灰岩油藏岩溶纵向分带研究