Oil & Gas Geology ›› 2021, Vol. 42 ›› Issue (3): 604-614.doi: 10.11743/ogg20210307

• Petroleum Geology • Previous Articles     Next Articles

Characteristics of deep Cambrian carbonate reservoirs in the Ordos Basin and main control factors

Chunlin Zhang1,2(), Jingli Yao3, Chengshan Li3, Fengcun Xing4, Liyong Fan3, Wuling Mo1,2, Qiuying Zhu1,2, Xu Zeng1,2   

  1. 1. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
    2. Key Laboratory of Gas Reservoir Formation and Development, CNPC, Langfang, Hebei 065007, China
    3. Changqing Oilfield Company, PetroChina, Xi'an, Shaanxi 710018, China
    4. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu, Sichuan 610059, China
  • Received:2020-12-16 Online:2021-06-28 Published:2021-06-23

Abstract:

The Cambrian carbonates are important oil and gas exploration targets in the Ordos Basin.An integration of the latest drilling and seismic data as well as outcrop and thin section observation shows that the Cambrian carbonates contain two major categories of reservoirs, i.e.facies-controlled and intensively structure-modified reservoirs.They can be further subdivided into eight types, of which the epigenetic karst and high-energy dolomitized oolitic shoal are the main reservoirs.The Cambrian carbonates are characterized by well-developed pores, cavities and fractures of different types and high diversity.The study proposes that the Cambrian reservoir development is mainly controlled by the dolomite of high-energy facies, epigenetic karstification of the paleo-uplift zone and faulting activity.And a model for the Cambrian reservoir development is also established.In addition, a discussion based on the study was carried out for the exploration direction of the Cambrian carbonates in the Ordos Basin and it is concluded that the Cambrian fractured-vuggy karst reservoirs around the Qingyang paleo-land at the southwestern margin of the basin shall be the next focus for exploration.

Key words: major control factor, exploration direction, reservoir characteristics, deep carbonate reservoir, Cambrian, Ordos Basin

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